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gcc/libstdc++-v3/acinclude.m4
Jonathan Wakely ebf6175464 libstdc++: Fix filesystem::remove_all races [PR104161] 
This fixes the remaining filesystem::remove_all race condition by using
POSIX openat to recurse into sub-directories and using POSIX unlinkat to
remove files. This avoids the remaining race where the directory being
removed is replaced with a symlink after the directory has been opened,
so that the filesystem::remove("subdir/file") resolves to "target/file"
instead, because "subdir" has been removed and replaced with a symlink.
The previous patch only fixed the case where the directory was replaced
with a symlink before we tried to open it, but it still used the full
(potentially compromised) path as an argument to filesystem::remove.

The first part of the fix is to use openat when recursing into a
sub-directory with recursive_directory_iterator. This means that opening
"dir/subdir" uses the file descriptor for "dir", and so is sure to open
"dir/subdir" and not "symlink/subdir". (The previous patch to use
O_NOFOLLOW already ensured we won't open "dir/symlink/" here.)

The second part of the fix is to use unlinkat for the remove_all
operation. Previously we used a directory_iterator to get the name of
each file in a directory and then used filesystem::remove(iter->path())
on that name. This meant that any checks (e.g. O_NOFOLLOW) done by the
iterator could be invalidated before the remove operation on that
pathname. The directory iterator contains an open DIR stream, which we
can use to obtain a file descriptor to pass to unlinkat. This ensures
that the file being deleted really is contained within the directory
we're iterating over, rather than using a pathname that could resolve to
some other file.

The filesystem::remove_all function previously used a (non-recursive)
filesystem::directory_iterator for each directory, and called itself
recursively for sub-directories. The new implementation uses a single
filesystem::recursive_directory_iterator object, and calls a new __erase
member function on that iterator. That new __erase member function does
the actual work of removing a file (or a directory after its contents
have been iterated over and removed) using unlinkat. That means we don't
need to expose the DIR stream or its file descriptor to the remove_all
function, it's still encapuslated by the iterator class.

It would be possible to add a __rewind member to directory iterators
too, to call rewinddir after each modification to the directory. That
would make it more likely for filesystem::remove_all to successfully
remove everything even if files are being written to the directory tree
while removing it. It's unclear if that is actually prefereable, or if
it's better to fail and report an error at the first opportunity.

The necessary APIs (openat, unlinkat, fdopendir, dirfd) are defined in
POSIX.1-2008, and in Glibc since 2.10. But if the target doesn't provide
them, the original code (with race conditions) is still used.

This also reduces the number of small memory allocations needed for
std::filesystem::remove_all, because we do not store the full path to
every directory entry that is iterated over. The new filename_only
option means we only store the filename in the directory entry, as that
is all we need in order to use openat or unlinkat.

Finally, rather than duplicating everything for the Filesystem TS, the
std::experimental::filesystem::remove_all implementation now just calls
std::filesystem::remove_all to do the work.

libstdc++-v3/ChangeLog:

	PR libstdc++/104161
	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for dirfd
	and unlinkat.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/bits/fs_dir.h (recursive_directory_iterator): Declare
	remove_all overloads as friends.
	(recursive_directory_iterator::__erase): Declare new member
	function.
	* include/bits/fs_fwd.h (remove, remove_all): Declare.
	* src/c++17/fs_dir.cc (_Dir): Add filename_only parameter to
	constructor. Pass file descriptor argument to base constructor.
	(_Dir::dir_and_pathname, _Dir::open_subdir, _Dir::do_unlink)
	(_Dir::unlink, _Dir::rmdir): Define new member functions.
	(directory_iterator): Pass filename_only argument to _Dir
	constructor.
	(recursive_directory_iterator::_Dir_stack): Adjust constructor
	parameters to take a _Dir rvalue instead of creating one.
	(_Dir_stack::orig): Add data member for storing original path.
	(_Dir_stack::report_error): Define new member function.
	(__directory_iterator_nofollow): Move here from dir-common.h and
	fix value to be a power of two.
	(__directory_iterator_filename_only): Define new constant.
	(recursive_directory_iterator): Construct _Dir object and move
	into _M_dirs stack. Pass skip_permission_denied argument to first
	advance call.
	(recursive_directory_iterator::increment): Use _Dir::open_subdir.
	(recursive_directory_iterator::__erase): Define new member
	function.
	* src/c++17/fs_ops.cc (ErrorReporter, do_remove_all): Remove.
	(fs::remove_all): Use new recursive_directory_iterator::__erase
	member function.
	* src/filesystem/dir-common.h (_Dir_base): Add int parameter to
	constructor and use openat to implement nofollow semantics.
	(_Dir_base::fdcwd, _Dir_base::set_close_on_exec, _Dir_base::openat):
	Define new member functions.
	(__directory_iterator_nofollow): Move to fs_dir.cc.
	* src/filesystem/dir.cc (_Dir): Pass file descriptor argument to
	base constructor.
	(_Dir::dir_and_pathname, _Dir::open_subdir): Define new member
	functions.
	(recursive_directory_iterator::_Dir_stack): Adjust constructor
	parameters to take a _Dir rvalue instead of creating one.
	(recursive_directory_iterator): Check for new nofollow option.
	Construct _Dir object and move into _M_dirs stack. Pass
	skip_permission_denied argument to first advance call.
	(recursive_directory_iterator::increment): Use _Dir::open_subdir.
	* src/filesystem/ops.cc (fs::remove_all): Use C++17 remove_all.
2022-02-04 19:51:26 +00:00

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dnl
dnl GLIBCXX_CONDITIONAL (NAME, SHELL-TEST)
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dnl Exactly like AM_CONDITIONAL, but delays evaluation of the test until the
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dnl
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dnl When fully dynamic strings are enabled, the static storage is not used
dnl and a new empty string with reference-count == 1 is allocated each time.
dnl Enabling this changes the libstdc++.so ABI.
dnl
dnl --enable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 1
dnl --disable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 0
dnl otherwise the macro is not defined.
dnl + Usage: GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING[(DEFAULT)]
dnl Where DEFAULT is either `yes' or `no'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING], [
GLIBCXX_ENABLE(fully-dynamic-string,$1,,[do not put empty strings in per-process static memory], [permit yes|no])
if test $enable_fully_dynamic_string = yes; then
enable_fully_dynamic_string_def=1
else
enable_fully_dynamic_string_def=0
fi
AC_DEFINE_UNQUOTED([_GLIBCXX_FULLY_DYNAMIC_STRING], [${enable_fully_dynamic_string_def}],
[Define to 1 if a fully dynamic basic_string is wanted, 0 to disable, undefined for platform defaults])
])
dnl
dnl Does any necessary configuration of the testsuite directory. Generates
dnl the testsuite_hooks.h header.
dnl
dnl GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE must be done before this.
dnl
dnl Sets:
dnl enable_abi_check
dnl GLIBCXX_TEST_WCHAR_T
dnl GLIBCXX_TEST_THREAD
dnl Substs:
dnl baseline_dir
dnl baseline_subdir_switch
dnl
AC_DEFUN([GLIBCXX_CONFIGURE_TESTSUITE], [
# Do checks for resource limit functions.
GLIBCXX_CHECK_SETRLIMIT
if $GLIBCXX_IS_NATIVE ; then
# Look for setenv, so that extended locale tests can be performed.
GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_3(setenv)
fi
if $GLIBCXX_IS_NATIVE && test $is_hosted = yes &&
test $enable_symvers != no; then
case "$host" in
*-*-cygwin*)
enable_abi_check=no ;;
*)
enable_abi_check=yes ;;
esac
else
# Only build this as native, since automake does not understand
# CXX_FOR_BUILD.
enable_abi_check=no
fi
# Export file names for ABI checking.
baseline_dir="$glibcxx_srcdir/config/abi/post/${abi_baseline_pair}"
AC_SUBST(baseline_dir)
baseline_subdir_switch="$abi_baseline_subdir_switch"
AC_SUBST(baseline_subdir_switch)
])
dnl
dnl Does any necessary configuration for docbook in the docs directory.
dnl
dnl XSLTPROC must be set before this
dnl
dnl Sets:
dnl glibcxx_stylesheets
dnl Substs:
dnl XSL_STYLE_DIR
dnl
AC_DEFUN([GLIBCXX_CONFIGURE_DOCBOOK], [
glibcxx_docbook_url=http://docbook.sourceforge.net/release/xsl-ns/current/
AC_MSG_CHECKING([for local stylesheet directory])
glibcxx_local_stylesheets=no
if test x${XMLCATALOG} = xyes && xsl_style_dir=`xmlcatalog "" $glibcxx_docbook_url 2>/dev/null`
then
XSL_STYLE_DIR=`echo $xsl_style_dir | sed -n 's;^file://;;p'`
glibcxx_local_stylesheets=yes
else
for dir in \
/usr/share/sgml/docbook/xsl-ns-stylesheets \
/usr/share/xml/docbook/stylesheet/docbook-xsl-ns \
/usr/share/xml/docbook/stylesheet/nwalsh5/current \
/usr/share/xml/docbook/stylesheet/nwalsh/current
do
if test -d $dir; then
glibcxx_local_stylesheets=yes
XSL_STYLE_DIR=$dir
break
fi
done
fi
AC_MSG_RESULT($glibcxx_local_stylesheets)
if test x"$glibcxx_local_stylesheets" = x"yes"; then
AC_SUBST(XSL_STYLE_DIR)
AC_MSG_NOTICE($XSL_STYLE_DIR)
AC_MSG_CHECKING([for docbook stylesheets for documentation creation])
glibcxx_stylesheets=no
if test x${XMLCATALOG} = xno || xmlcatalog "" $glibcxx_docbook_url/xhtml/docbook.xsl >/dev/null 2>&1; then
if test x${XSLTPROC} = xyes && echo '<title/>' | xsltproc --noout --nonet --xinclude $glibcxx_docbook_url/xhtml/docbook.xsl - 2>/dev/null; then
glibcxx_stylesheets=yes
fi
fi
AC_MSG_RESULT($glibcxx_stylesheets)
else
glibcxx_stylesheets=no
fi
# Check for epub3 dependencies.
AC_MSG_CHECKING([for epub3 stylesheets for documentation creation])
glibcxx_epub_stylesheets=no
if test x"$glibcxx_local_stylesheets" = x"yes"; then
if test -f "$XSL_STYLE_DIR/epub3/chunk.xsl"; then
glibcxx_epub_stylesheets=yes
fi
fi
AC_MSG_RESULT($glibcxx_epub_stylesheets)
AM_CONDITIONAL(BUILD_EPUB, test x"$glibcxx_epub_stylesheets" = x"yes")
])
dnl
dnl Set up *_INCLUDES variables for all sundry Makefile.am's.
dnl
dnl Substs:
dnl GLIBCXX_INCLUDES
dnl TOPLEVEL_INCLUDES
dnl
AC_DEFUN([GLIBCXX_EXPORT_INCLUDES], [
# Used for every C++ compile we perform.
GLIBCXX_INCLUDES="\
-I$glibcxx_builddir/include/$host_alias \
-I$glibcxx_builddir/include \
-I$glibcxx_srcdir/libsupc++"
# For Canadian crosses, pick this up too.
if test $CANADIAN = yes; then
GLIBCXX_INCLUDES="$GLIBCXX_INCLUDES -I\${includedir}"
fi
# Stuff in the actual top level. Currently only used by libsupc++ to
# get unwind* headers from the libgcc dir.
#TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc -I$(toplevel_srcdir)/include'
TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc'
# Now, export this to all the little Makefiles....
AC_SUBST(GLIBCXX_INCLUDES)
AC_SUBST(TOPLEVEL_INCLUDES)
])
dnl
dnl Set up *_FLAGS and *FLAGS variables for all sundry Makefile.am's.
dnl (SECTION_FLAGS is done under CHECK_COMPILER_FEATURES.)
dnl
dnl Substs:
dnl OPTIMIZE_CXXFLAGS
dnl WARN_FLAGS
dnl
AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
# Optimization flags that are probably a good idea for thrill-seekers. Just
# uncomment the lines below and make, everything else is ready to go...
# Alternatively OPTIMIZE_CXXFLAGS can be set in configure.host.
# OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
AC_SUBST(OPTIMIZE_CXXFLAGS)
WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
AC_SUBST(WARN_FLAGS)
])
dnl
dnl All installation directory information is determined here.
dnl
dnl Substs:
dnl gxx_install_dir
dnl glibcxx_prefixdir
dnl glibcxx_toolexecdir
dnl glibcxx_toolexeclibdir
dnl
dnl Assumes cross_compiling bits already done, and with_cross_host in
dnl particular.
dnl
dnl This logic must match gcc/configure.ac's setting of gcc_gxx_include_dir.
dnl config/gxx-include-dir.m4 must be kept consistant with this as well.
AC_DEFUN([GLIBCXX_EXPORT_INSTALL_INFO], [
glibcxx_toolexecdir=no
glibcxx_toolexeclibdir=no
glibcxx_prefixdir=$prefix
AC_MSG_CHECKING([for gxx-include-dir])
AC_ARG_WITH([gxx-include-dir],
AC_HELP_STRING([--with-gxx-include-dir=DIR],
[installation directory for include files]),
[case "$withval" in
yes) AC_MSG_ERROR([Missing directory for --with-gxx-include-dir]) ;;
no) gxx_include_dir=no ;;
*) gxx_include_dir=$withval ;;
esac],
[gxx_include_dir=no])
AC_MSG_RESULT($gxx_include_dir)
AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
AC_ARG_ENABLE([version-specific-runtime-libs],
AC_HELP_STRING([--enable-version-specific-runtime-libs],
[Specify that runtime libraries should be installed in a compiler-specific directory]),
[case "$enableval" in
yes) version_specific_libs=yes ;;
no) version_specific_libs=no ;;
*) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
esac],
[version_specific_libs=no])
AC_MSG_RESULT($version_specific_libs)
GCC_WITH_TOOLEXECLIBDIR
# Default case for install directory for include files.
if test $version_specific_libs = no && test $gxx_include_dir = no; then
gxx_include_dir='include/c++/${gcc_version}'
if test -n "$with_cross_host" &&
test x"$with_cross_host" != x"no"; then
gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
else
gxx_include_dir='${prefix}/'"$gxx_include_dir"
fi
fi
# Version-specific runtime libs processing.
if test $version_specific_libs = yes; then
# Need the gcc compiler version to know where to install libraries
# and header files if --enable-version-specific-runtime-libs option
# is selected. FIXME: these variables are misnamed, there are
# no executables installed in _toolexecdir or _toolexeclibdir.
if test x"$gxx_include_dir" = x"no"; then
gxx_include_dir='${libdir}/gcc/${host_alias}/${gcc_version}/include/c++'
fi
glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
glibcxx_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
fi
# Calculate glibcxx_toolexecdir, glibcxx_toolexeclibdir
# Install a library built with a cross compiler in tooldir, not libdir.
if test x"$glibcxx_toolexecdir" = x"no"; then
if test -n "$with_cross_host" &&
test x"$with_cross_host" != x"no"; then
glibcxx_toolexecdir='${exec_prefix}/${host_alias}'
case ${with_toolexeclibdir} in
no)
glibcxx_toolexeclibdir='${toolexecdir}/lib'
;;
*)
glibcxx_toolexeclibdir=${with_toolexeclibdir}
;;
esac
else
glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
glibcxx_toolexeclibdir='${libdir}'
fi
multi_os_directory=`$CXX -print-multi-os-directory`
case $multi_os_directory in
.) ;; # Avoid trailing /.
*) glibcxx_toolexeclibdir=$glibcxx_toolexeclibdir/$multi_os_directory ;;
esac
fi
AC_MSG_CHECKING([for install location])
AC_MSG_RESULT($gxx_include_dir)
AC_SUBST(glibcxx_prefixdir)
AC_SUBST(gxx_include_dir)
AC_SUBST(glibcxx_toolexecdir)
AC_SUBST(glibcxx_toolexeclibdir)
])
dnl
dnl GLIBCXX_ENABLE
dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
dnl
dnl See manual/appendix_porting.html#appendix.porting.build_hacking for
dnl documentation.
dnl
m4_define([GLIBCXX_ENABLE],[dnl
m4_define([_g_switch],[--enable-$1])dnl
m4_define([_g_help],[AC_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
AC_ARG_ENABLE([$1],m4_dquote(_g_help),
m4_bmatch([$5],
[^permit ],
[[
case "$enableval" in
m4_bpatsubst([$5],[permit ])) ;;
*) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
dnl Idea for future: generate a URL pointing to
dnl "onlinedocs/configopts.html#whatever"
esac
]],
[^$],
[[
case "$enableval" in
yes|no) ;;
*) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
esac
]],
[[$5]]),
[enable_]m4_bpatsubst([$1],-,_)[=][$2])
m4_undefine([_g_switch])dnl
m4_undefine([_g_help])dnl
])
dnl
dnl Check for ISO/IEC 9899:1999 "C99" support.
dnl
dnl --enable-c99 defines _GLIBCXX_USE_C99
dnl --disable-c99 leaves _GLIBCXX_USE_C99 undefined
dnl + Usage: GLIBCXX_ENABLE_C99[(DEFAULT)]
dnl Where DEFAULT is either `yes' or `no'.
dnl + If 'C99' stuff is not available, ignores DEFAULT and sets `no'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_C99], [
GLIBCXX_ENABLE(c99,$1,,[turns on ISO/IEC 9899:1999 support])
if test x"$enable_c99" = x"yes"; then
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
# Use -std=c++98 (instead of -std=gnu++98) because leaving __STRICT_ANSI__
# undefined may cause fake C99 facilities, like pre-standard snprintf,
# to be spuriously enabled.
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++98"
ac_save_LIBS="$LIBS"
ac_save_gcc_no_link="$gcc_no_link"
if test x$gcc_no_link != xyes; then
# Use -fno-exceptions to that the C driver can link these tests without
# hitting undefined references to personality routines.
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
# Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
gcc_no_link=yes
])
fi
# Check for the existence of <math.h> functions used if C99 is enabled.
AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++98],
glibcxx_cv_c99_math_cxx98, [
GCC_TRY_COMPILE_OR_LINK(
[#include <math.h>
volatile double d1, d2;
volatile int i;],
[i = fpclassify(d1);
i = isfinite(d1);
i = isinf(d1);
i = isnan(d1);
i = isnormal(d1);
i = signbit(d1);
i = isgreater(d1, d2);
i = isgreaterequal(d1, d2);
i = isless(d1, d2);
i = islessequal(d1, d2);
i = islessgreater(d1, d2);
i = islessgreater(d1, d2);
i = isunordered(d1, d2);
], [glibcxx_cv_c99_math_cxx98=yes], [glibcxx_cv_c99_math_cxx98=no])
])
if test x"$glibcxx_cv_c99_math_cxx98" = x"yes"; then
AC_DEFINE(_GLIBCXX98_USE_C99_MATH, 1,
[Define if C99 functions or macros in <math.h> should be imported
in <cmath> in namespace std for C++98.])
fi
# Check for the existence of <complex.h> complex math functions.
# This is necessary even though libstdc++ uses the builtin versions
# of these functions, because if the builtin cannot be used, a reference
# to the library function is emitted.
AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
if test x"$ac_has_complex_h" = x"yes"; then
AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++98],
glibcxx_cv_c99_complex_cxx98, [
GCC_TRY_COMPILE_OR_LINK(
[#include <complex.h>
typedef __complex__ float float_type;
typedef __complex__ double double_type;
typedef __complex__ long double ld_type;
volatile float_type tmpf;
volatile double_type tmpd;
volatile ld_type tmpld;
volatile float f;
volatile double d;
volatile long double ld;],
[f = cabsf(tmpf);
f = cargf(tmpf);
tmpf = ccosf(tmpf);
tmpf = ccoshf(tmpf);
tmpf = cexpf(tmpf);
tmpf = clogf(tmpf);
tmpf = csinf(tmpf);
tmpf = csinhf(tmpf);
tmpf = csqrtf(tmpf);
tmpf = ctanf(tmpf);
tmpf = ctanhf(tmpf);
tmpf = cpowf(tmpf, tmpf);
tmpf = cprojf(tmpf);
d = cabs(tmpd);
d = carg(tmpd);
tmpd = ccos(tmpd);
tmpd = ccosh(tmpd);
tmpd = cexp(tmpd);
tmpd = clog(tmpd);
tmpd = csin(tmpd);
tmpd = csinh(tmpd);
tmpd = csqrt(tmpd);
tmpd = ctan(tmpd);
tmpd = ctanh(tmpd);
tmpd = cpow(tmpd, tmpd);
tmpd = cproj(tmpd);
ld = cabsl(tmpld);
ld = cargl(tmpld);
tmpld = ccosl(tmpld);
tmpld = ccoshl(tmpld);
tmpld = cexpl(tmpld);
tmpld = clogl(tmpld);
tmpld = csinl(tmpld);
tmpld = csinhl(tmpld);
tmpld = csqrtl(tmpld);
tmpld = ctanl(tmpld);
tmpld = ctanhl(tmpld);
tmpld = cpowl(tmpld, tmpld);
tmpld = cprojl(tmpld);
], [glibcxx_cv_c99_complex_cxx98=yes], [glibcxx_cv_c99_complex_cxx98=no])
])
fi
if test x"$glibcxx_cv_c99_complex_cxx98" = x"yes"; then
AC_DEFINE(_GLIBCXX98_USE_C99_COMPLEX, 1,
[Define if C99 functions in <complex.h> should be used in
<complex> for C++98. Using compiler builtins for these functions
requires corresponding C99 library functions to be present.])
fi
# Check for the existence in <stdio.h> of vscanf, et. al.
AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++98],
glibcxx_cv_c99_stdio_cxx98, [
GCC_TRY_COMPILE_OR_LINK(
[#include <stdio.h>
#include <stdarg.h>
void foo(char* fmt, ...)
{
va_list args; va_start(args, fmt);
vfscanf(stderr, "%i", args);
vscanf("%i", args);
vsnprintf(fmt, 0, "%i", args);
vsscanf(fmt, "%i", args);
snprintf(fmt, 0, "%i");
}], [],
[glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
])
if test x"$glibcxx_cv_c99_stdio_cxx98" = x"yes"; then
AC_DEFINE(_GLIBCXX98_USE_C99_STDIO, 1,
[Define if C99 functions or macros in <stdio.h> should be imported
in <cstdio> in namespace std for C++98.])
fi
# Check for the existence in <stdlib.h> of lldiv_t, et. al.
AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++98],
glibcxx_cv_c99_stdlib_cxx98, [
GCC_TRY_COMPILE_OR_LINK(
[#include <stdlib.h>
volatile float f;
volatile long double ld;
volatile unsigned long long ll;
lldiv_t mydivt;],
[char* tmp;
f = strtof("gnu", &tmp);
ld = strtold("gnu", &tmp);
ll = strtoll("gnu", &tmp, 10);
ll = strtoull("gnu", &tmp, 10);
ll = llabs(10);
mydivt = lldiv(10,1);
ll = mydivt.quot;
ll = mydivt.rem;
ll = atoll("10");
_Exit(0);
], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
])
if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
[Define if C99 functions or macros in <stdlib.h> should be imported
in <cstdlib> in namespace std for C++98.])
fi
# Check for the existence in <wchar.h> of wcstold, etc.
if test x"$ac_has_wchar_h" = xyes &&
test x"$ac_has_wctype_h" = xyes; then
AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++98],
glibcxx_cv_c99_wchar_cxx98, [
AC_TRY_COMPILE([#include <wchar.h>
namespace test
{
using ::wcstold;
using ::wcstoll;
using ::wcstoull;
}
], [], [glibcxx_cv_c99_wchar_cxx98=yes], [glibcxx_cv_c99_wchar_cxx98=no])
])
# Checks for wide character functions that may not be present.
# Injection of these is wrapped with guard macros.
# NB: only put functions here, instead of immediately above, if
# absolutely necessary.
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::vfwscanf; }], [],
[AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::vswscanf; }], [],
[AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::vwscanf; }], [],
[AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::wcstof; }], [],
[AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
AC_TRY_COMPILE([#include <wctype.h>],
[wint_t t; int i = iswblank(t);],
[AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
if test x"$glibcxx_cv_c99_wchar_cxx98" = x"yes"; then
AC_DEFINE(_GLIBCXX98_USE_C99_WCHAR, 1,
[Define if C99 functions or macros in <wchar.h> should be imported
in <cwchar> in namespace std for C++98.])
fi
fi
# Option parsed, now set things appropriately.
if test x"$glibcxx_cv_c99_math_cxx98" = x"no" ||
test x"$glibcxx_cv_c99_complex_cxx98" = x"no" ||
test x"$glibcxx_cv_c99_stdio_cxx98" = x"no" ||
test x"$glibcxx_cv_c99_stdlib_cxx98" = x"no" ||
test x"$glibcxx_cv_c99_wchar_cxx98" = x"no"; then
enable_c99=no;
else
AC_DEFINE(_GLIBCXX_USE_C99, 1,
[Define if C99 functions or macros from <wchar.h>, <math.h>,
<complex.h>, <stdio.h>, and <stdlib.h> can be used or exposed.])
fi
gcc_no_link="$ac_save_gcc_no_link"
LIBS="$ac_save_LIBS"
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
# Use -std=c++11 and test again for C99 library feature in C++11 mode.
# For the reasons given above we use -std=c++11 not -std=gnu++11.
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++11"
ac_save_LIBS="$LIBS"
ac_save_gcc_no_link="$gcc_no_link"
if test x$gcc_no_link != xyes; then
# Use -fno-exceptions to that the C driver can link these tests without
# hitting undefined references to personality routines.
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
# Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
gcc_no_link=yes
])
fi
# Check for the existence of <math.h> functions used if C99 is enabled.
AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++11],
glibcxx_cv_c99_math_cxx11, [
GCC_TRY_COMPILE_OR_LINK(
[#include <math.h>
volatile double d1, d2;
volatile int i;],
[i = fpclassify(d1);
i = isfinite(d1);
i = isinf(d1);
i = isnan(d1);
i = isnormal(d1);
i = signbit(d1);
i = isgreater(d1, d2);
i = isgreaterequal(d1, d2);
i = isless(d1, d2);
i = islessequal(d1, d2);
i = islessgreater(d1, d2);
i = islessgreater(d1, d2);
i = isunordered(d1, d2);
], [glibcxx_cv_c99_math_cxx11=yes], [glibcxx_cv_c99_math_cxx11=no])
])
if test x"$glibcxx_cv_c99_math_cxx11" = x"yes"; then
AC_DEFINE(_GLIBCXX11_USE_C99_MATH, 1,
[Define if C99 functions or macros in <math.h> should be imported
in <cmath> in namespace std for C++11.])
fi
# Check for the existence of <complex.h> complex math functions.
# This is necessary even though libstdc++ uses the builtin versions
# of these functions, because if the builtin cannot be used, a reference
# to the library function is emitted.
AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
if test x"$ac_has_complex_h" = x"yes"; then
AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++11],
glibcxx_cv_c99_complex_cxx11, [
GCC_TRY_COMPILE_OR_LINK(
[#include <complex.h>
typedef __complex__ float float_type;
typedef __complex__ double double_type;
typedef __complex__ long double ld_type;
volatile float_type tmpf;
volatile double_type tmpd;
volatile ld_type tmpld;
volatile float f;
volatile double d;
volatile long double ld;],
[f = cabsf(tmpf);
f = cargf(tmpf);
tmpf = ccosf(tmpf);
tmpf = ccoshf(tmpf);
tmpf = cexpf(tmpf);
tmpf = clogf(tmpf);
tmpf = csinf(tmpf);
tmpf = csinhf(tmpf);
tmpf = csqrtf(tmpf);
tmpf = ctanf(tmpf);
tmpf = ctanhf(tmpf);
tmpf = cpowf(tmpf, tmpf);
tmpf = cprojf(tmpf);
d = cabs(tmpd);
d = carg(tmpd);
tmpd = ccos(tmpd);
tmpd = ccosh(tmpd);
tmpd = cexp(tmpd);
tmpd = clog(tmpd);
tmpd = csin(tmpd);
tmpd = csinh(tmpd);
tmpd = csqrt(tmpd);
tmpd = ctan(tmpd);
tmpd = ctanh(tmpd);
tmpd = cpow(tmpd, tmpd);
tmpd = cproj(tmpd);
ld = cabsl(tmpld);
ld = cargl(tmpld);
tmpld = ccosl(tmpld);
tmpld = ccoshl(tmpld);
tmpld = cexpl(tmpld);
tmpld = clogl(tmpld);
tmpld = csinl(tmpld);
tmpld = csinhl(tmpld);
tmpld = csqrtl(tmpld);
tmpld = ctanl(tmpld);
tmpld = ctanhl(tmpld);
tmpld = cpowl(tmpld, tmpld);
tmpld = cprojl(tmpld);
], [glibcxx_cv_c99_complex_cxx11=yes], [glibcxx_cv_c99_complex_cxx11=no])
])
fi
if test x"$glibcxx_cv_c99_complex_cxx11" = x"yes"; then
AC_DEFINE(_GLIBCXX11_USE_C99_COMPLEX, 1,
[Define if C99 functions in <complex.h> should be used in
<complex> for C++11. Using compiler builtins for these functions
requires corresponding C99 library functions to be present.])
fi
# Check for the existence in <stdio.h> of vscanf, et. al.
AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++11],
glibcxx_cv_c99_stdio_cxx11, [
GCC_TRY_COMPILE_OR_LINK(
[#include <stdio.h>
#include <stdarg.h>
void foo(char* fmt, ...)
{
va_list args; va_start(args, fmt);
vfscanf(stderr, "%i", args);
vscanf("%i", args);
vsnprintf(fmt, 0, "%i", args);
vsscanf(fmt, "%i", args);
snprintf(fmt, 0, "%i");
}], [],
[glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
])
if test x"$glibcxx_cv_c99_stdio_cxx11" = x"yes"; then
AC_DEFINE(_GLIBCXX11_USE_C99_STDIO, 1,
[Define if C99 functions or macros in <stdio.h> should be imported
in <cstdio> in namespace std for C++11.])
fi
# Check for the existence in <stdlib.h> of lldiv_t, et. al.
AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++11],
glibcxx_cv_c99_stdlib_cxx11, [
GCC_TRY_COMPILE_OR_LINK(
[#include <stdlib.h>
volatile float f;
volatile long double ld;
volatile unsigned long long ll;
lldiv_t mydivt;],
[char* tmp;
f = strtof("gnu", &tmp);
ld = strtold("gnu", &tmp);
ll = strtoll("gnu", &tmp, 10);
ll = strtoull("gnu", &tmp, 10);
ll = llabs(10);
mydivt = lldiv(10,1);
ll = mydivt.quot;
ll = mydivt.rem;
ll = atoll("10");
_Exit(0);
], [glibcxx_cv_c99_stdlib_cxx11=yes], [glibcxx_cv_c99_stdlib_cxx11=no])
])
if test x"$glibcxx_cv_c99_stdlib_cxx11" = x"yes"; then
AC_DEFINE(_GLIBCXX11_USE_C99_STDLIB, 1,
[Define if C99 functions or macros in <stdlib.h> should be imported
in <cstdlib> in namespace std for C++11.])
fi
# Check for the existence in <wchar.h> of wcstold, etc.
if test x"$ac_has_wchar_h" = xyes &&
test x"$ac_has_wctype_h" = xyes; then
AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++11],
glibcxx_cv_c99_wchar_cxx11, [
AC_TRY_COMPILE([#include <wchar.h>
namespace test
{
using ::wcstold;
using ::wcstoll;
using ::wcstoull;
}
], [], [glibcxx_cv_c99_wchar_cxx11=yes], [glibcxx_cv_c99_wchar_cxx11=no])
])
# Checks for wide character functions that may not be present.
# Injection of these is wrapped with guard macros.
# NB: only put functions here, instead of immediately above, if
# absolutely necessary.
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::vfwscanf; }], [],
[AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::vswscanf; }], [],
[AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::vwscanf; }], [],
[AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
AC_TRY_COMPILE([#include <wchar.h>
namespace test { using ::wcstof; }], [],
[AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
AC_TRY_COMPILE([#include <wctype.h>],
[wint_t t; int i = iswblank(t);],
[AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
if test x"$glibcxx_cv_c99_wchar_cxx11" = x"yes"; then
AC_DEFINE(_GLIBCXX11_USE_C99_WCHAR, 1,
[Define if C99 functions or macros in <wchar.h> should be imported
in <cwchar> in namespace std for C++11.])
fi
fi
gcc_no_link="$ac_save_gcc_no_link"
LIBS="$ac_save_LIBS"
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
fi
AC_MSG_CHECKING([for fully enabled ISO C99 support])
AC_MSG_RESULT($enable_c99)
])
dnl
dnl Check for clock_gettime, nanosleep and sched_yield, used in the
dnl implementation of 20.11.7 [time.clock], and 30.3.2 [thread.thread.this]
dnl in the C++11 standard.
dnl
dnl --enable-libstdcxx-time
dnl --enable-libstdcxx-time=yes
dnl checks for the availability of monotonic and realtime clocks,
dnl nanosleep and sched_yield in libc.
dnl --enable-libstdcxx-time=rt
dnl also searches (and, if needed, links) librt. Note that this is
dnl not always desirable because, in glibc 2.16 and earlier, for
dnl example, in turn it triggers the linking of libpthread too,
dnl which activates locking,
dnl a large overhead for single-thread programs.
dnl --enable-libstdcxx-time=no
dnl --disable-libstdcxx-time
dnl disables the checks completely
dnl
dnl N.B. Darwin provides nanosleep but doesn't support the whole POSIX
dnl Timers option, so doesn't define _POSIX_TIMERS. Because the test
dnl below fails Darwin unconditionally defines _GLIBCXX_USE_NANOSLEEP in
dnl os_defines.h and also defines _GLIBCXX_USE_SCHED_YIELD.
dnl
AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
GLIBCXX_ENABLE(libstdcxx-time,auto,[[[=KIND]]],
[use KIND for check type],
[permit yes|no|rt])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
ac_save_LIBS="$LIBS"
ac_has_clock_monotonic=no
ac_has_clock_realtime=no
ac_has_nanosleep=no
ac_has_sched_yield=no
if test x"$enable_libstdcxx_time" = x"auto"; then
case "${target_os}" in
cygwin*)
ac_has_nanosleep=yes
;;
darwin*)
ac_has_nanosleep=yes
ac_has_sched_yield=yes
;;
# VxWorks has nanosleep as soon as the kernel is configured with
# INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
vxworks*)
ac_has_nanosleep=yes
;;
gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
# Don't use link test for freestanding library, in case gcc_no_link=yes
if test x"$is_hosted" = xyes; then
# Versions of glibc before 2.17 needed -lrt for clock_gettime.
AC_SEARCH_LIBS(clock_gettime, [rt])
if test x"$ac_cv_search_clock_gettime" = x"none required"; then
ac_has_clock_monotonic=yes
ac_has_clock_realtime=yes
fi
fi
ac_has_nanosleep=yes
ac_has_sched_yield=yes
;;
freebsd*|netbsd*|dragonfly*|rtems*)
ac_has_clock_monotonic=yes
ac_has_clock_realtime=yes
ac_has_nanosleep=yes
ac_has_sched_yield=yes
;;
openbsd*)
ac_has_clock_monotonic=yes
ac_has_clock_realtime=yes
ac_has_nanosleep=yes
;;
solaris*)
ac_has_clock_monotonic=yes
ac_has_clock_realtime=yes
ac_has_nanosleep=yes
ac_has_sched_yield=yes
;;
uclinux*)
ac_has_nanosleep=yes
ac_has_sched_yield=yes
esac
elif test x"$enable_libstdcxx_time" != x"no"; then
if test x"$enable_libstdcxx_time" = x"rt"; then
AC_SEARCH_LIBS(clock_gettime, [rt])
AC_SEARCH_LIBS(nanosleep, [rt])
else
AC_CHECK_FUNC(clock_gettime)
AC_CHECK_FUNC(nanosleep)
fi
case "$ac_cv_search_clock_gettime" in
-l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
;;
esac
case "$ac_cv_search_nanosleep" in
-l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
;;
esac
AC_SEARCH_LIBS(sched_yield, [rt])
case "$ac_cv_search_sched_yield" in
-lrt*)
if test x"$enable_libstdcxx_time" = x"rt"; then
GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
ac_has_sched_yield=yes
fi
;;
*)
ac_has_sched_yield=yes
;;
esac
AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
if test x"$ac_has_unistd_h" = x"yes"; then
AC_MSG_CHECKING([for monotonic clock])
AC_TRY_LINK(
[#include <unistd.h>
#include <time.h>
],
[#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
timespec tp;
#endif
clock_gettime(CLOCK_MONOTONIC, &tp);
], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
AC_MSG_RESULT($ac_has_clock_monotonic)
AC_MSG_CHECKING([for realtime clock])
AC_TRY_LINK(
[#include <unistd.h>
#include <time.h>
],
[#if _POSIX_TIMERS > 0
timespec tp;
#endif
clock_gettime(CLOCK_REALTIME, &tp);
], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
AC_MSG_RESULT($ac_has_clock_realtime)
AC_MSG_CHECKING([for nanosleep])
AC_TRY_LINK(
[#include <unistd.h>
#include <time.h>
],
[#if _POSIX_TIMERS > 0
timespec tp;
#endif
nanosleep(&tp, 0);
], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
AC_MSG_RESULT($ac_has_nanosleep)
fi
fi
if test x"$ac_has_clock_monotonic" != x"yes"; then
case ${target_os} in
linux* | uclinux*)
AC_MSG_CHECKING([for clock_gettime syscall])
AC_TRY_COMPILE(
[#include <unistd.h>
#include <time.h>
#include <sys/syscall.h>
],
[#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
timespec tp;
#endif
syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
], [ac_has_clock_gettime_syscall=yes], [ac_has_clock_gettime_syscall=no])
AC_MSG_RESULT($ac_has_clock_gettime_syscall)
if test x"$ac_has_clock_gettime_syscall" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
[Defined if clock_gettime syscall has monotonic and realtime clock support. ])
ac_has_clock_monotonic=yes
ac_has_clock_realtime=yes
AC_MSG_CHECKING([for struct timespec that matches syscall])
AC_TRY_COMPILE(
[#include <time.h>
#include <sys/syscall.h>
],
[#ifdef SYS_clock_gettime64
#if SYS_clock_gettime64 != SYS_clock_gettime
// We need to use SYS_clock_gettime and libc appears to
// also know about the SYS_clock_gettime64 syscall.
// Check that userspace doesn't use time64 version of timespec.
static_assert(sizeof(timespec::tv_sec) == sizeof(long),
"struct timespec must be compatible with SYS_clock_gettime");
#endif
#endif
],
[ac_timespec_matches_syscall=yes],
[ac_timespec_matches_syscall=no])
AC_MSG_RESULT($ac_timespec_matches_syscall)
if test x"$ac_timespec_matches_syscall" = no; then
AC_MSG_ERROR([struct timespec is not compatible with SYS_clock_gettime, please report a bug to http://gcc.gnu.org/bugzilla])
fi
fi;;
esac
fi
if test x"$ac_has_clock_monotonic" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
[ Defined if clock_gettime has monotonic clock support. ])
fi
if test x"$ac_has_clock_realtime" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
[ Defined if clock_gettime has realtime clock support. ])
fi
if test x"$ac_has_sched_yield" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
[ Defined if sched_yield is available. ])
fi
if test x"$ac_has_nanosleep" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
[ Defined if nanosleep is available. ])
else
AC_MSG_CHECKING([for sleep])
AC_TRY_COMPILE([#include <unistd.h>],
[sleep(1)],
[ac_has_sleep=yes],[ac_has_sleep=no])
if test x"$ac_has_sleep" = x"yes"; then
AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
fi
AC_MSG_RESULT($ac_has_sleep)
AC_MSG_CHECKING([for usleep])
AC_TRY_COMPILE([#include <unistd.h>],
[sleep(1);
usleep(100);],
[ac_has_usleep=yes],[ac_has_usleep=no])
if test x"$ac_has_usleep" = x"yes"; then
AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
fi
AC_MSG_RESULT($ac_has_usleep)
fi
if test x"$ac_has_nanosleep$ac_has_sleep" = x"nono"; then
ac_no_sleep=yes
AC_MSG_CHECKING([for Sleep])
AC_TRY_COMPILE([#include <windows.h>],
[Sleep(1)],
[ac_has_win32_sleep=yes],[ac_has_win32_sleep=no])
if test x"$ac_has_win32_sleep" = x"yes"; then
AC_DEFINE(HAVE_WIN32_SLEEP,1, [Defined if Sleep exists.])
ac_no_sleep=no
fi
AC_MSG_RESULT($ac_has_win32_sleep)
fi
if test x"$ac_no_sleep" = x"yes"; then
AC_DEFINE(_GLIBCXX_NO_SLEEP,1, [Defined if no way to sleep is available.])
fi
AC_SUBST(GLIBCXX_LIBS)
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
AC_LANG_RESTORE
])
dnl
dnl Check for gettimeofday, used in the implementation of 20.11.7
dnl [time.clock] in the C++11 standard.
dnl
AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
AC_MSG_CHECKING([for gettimeofday])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
ac_has_gettimeofday=no;
AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
if test x"$ac_has_sys_time_h" = x"yes"; then
AC_MSG_CHECKING([for gettimeofday])
GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
[timeval tv; gettimeofday(&tv, 0);],
[ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
AC_MSG_RESULT($ac_has_gettimeofday)
fi
if test x"$ac_has_gettimeofday" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
[ Defined if gettimeofday is available. ])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
dnl facilities in Chapter 8, "C compatibility".
dnl
AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
# Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
# undefined and fake C99 facilities may be spuriously enabled.
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++98"
# Check for the existence of <complex.h> complex math functions used
# by tr1/complex.
AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
ac_c99_complex_tr1=no;
if test x"$ac_has_complex_h" = x"yes"; then
AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
AC_TRY_COMPILE([#include <complex.h>],
[typedef __complex__ float float_type; float_type tmpf;
cacosf(tmpf);
casinf(tmpf);
catanf(tmpf);
cacoshf(tmpf);
casinhf(tmpf);
catanhf(tmpf);
typedef __complex__ double double_type; double_type tmpd;
cacos(tmpd);
casin(tmpd);
catan(tmpd);
cacosh(tmpd);
casinh(tmpd);
catanh(tmpd);
typedef __complex__ long double ld_type; ld_type tmpld;
cacosl(tmpld);
casinl(tmpld);
catanl(tmpld);
cacoshl(tmpld);
casinhl(tmpld);
catanhl(tmpld);
],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
fi
AC_MSG_RESULT($ac_c99_complex_tr1)
if test x"$ac_c99_complex_tr1" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
[Define if C99 functions in <complex.h> should be used in
<tr1/complex>. Using compiler builtins for these functions
requires corresponding C99 library functions to be present.])
fi
# Check for the existence of <ctype.h> functions.
AC_CACHE_CHECK([for ISO C99 support to TR1 in <ctype.h>],
glibcxx_cv_c99_ctype_tr1, [
AC_TRY_COMPILE([#include <ctype.h>],
[int ch;
int ret;
ret = isblank(ch);
],[glibcxx_cv_c99_ctype_tr1=yes],
[glibcxx_cv_c99_ctype_tr1=no])
])
if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
[Define if C99 functions in <ctype.h> should be imported in
<tr1/cctype> in namespace std::tr1.])
fi
# Check for the existence of <fenv.h> functions.
AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
ac_c99_fenv_tr1=no;
if test x"$ac_has_fenv_h" = x"yes"; then
AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
AC_TRY_COMPILE([#include <fenv.h>],
[int except, mode;
fexcept_t* pflag;
fenv_t* penv;
int ret;
ret = feclearexcept(except);
ret = fegetexceptflag(pflag, except);
ret = feraiseexcept(except);
ret = fesetexceptflag(pflag, except);
ret = fetestexcept(except);
ret = fegetround();
ret = fesetround(mode);
ret = fegetenv(penv);
ret = feholdexcept(penv);
ret = fesetenv(penv);
ret = feupdateenv(penv);
],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
AC_MSG_RESULT($ac_c99_fenv_tr1)
fi
if test x"$ac_c99_fenv_tr1" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
[Define if C99 functions in <fenv.h> should be imported in
<tr1/cfenv> in namespace std::tr1.])
fi
# Check for the existence of <stdint.h> types.
AC_CACHE_CHECK([for ISO C99 support to TR1 in <stdint.h>],
glibcxx_cv_c99_stdint_tr1, [
AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
#define __STDC_CONSTANT_MACROS
#include <stdint.h>],
[typedef int8_t my_int8_t;
my_int8_t i8 = INT8_MIN;
i8 = INT8_MAX;
typedef int16_t my_int16_t;
my_int16_t i16 = INT16_MIN;
i16 = INT16_MAX;
typedef int32_t my_int32_t;
my_int32_t i32 = INT32_MIN;
i32 = INT32_MAX;
typedef int64_t my_int64_t;
my_int64_t i64 = INT64_MIN;
i64 = INT64_MAX;
typedef int_fast8_t my_int_fast8_t;
my_int_fast8_t if8 = INT_FAST8_MIN;
if8 = INT_FAST8_MAX;
typedef int_fast16_t my_int_fast16_t;
my_int_fast16_t if16 = INT_FAST16_MIN;
if16 = INT_FAST16_MAX;
typedef int_fast32_t my_int_fast32_t;
my_int_fast32_t if32 = INT_FAST32_MIN;
if32 = INT_FAST32_MAX;
typedef int_fast64_t my_int_fast64_t;
my_int_fast64_t if64 = INT_FAST64_MIN;
if64 = INT_FAST64_MAX;
typedef int_least8_t my_int_least8_t;
my_int_least8_t il8 = INT_LEAST8_MIN;
il8 = INT_LEAST8_MAX;
typedef int_least16_t my_int_least16_t;
my_int_least16_t il16 = INT_LEAST16_MIN;
il16 = INT_LEAST16_MAX;
typedef int_least32_t my_int_least32_t;
my_int_least32_t il32 = INT_LEAST32_MIN;
il32 = INT_LEAST32_MAX;
typedef int_least64_t my_int_least64_t;
my_int_least64_t il64 = INT_LEAST64_MIN;
il64 = INT_LEAST64_MAX;
typedef intmax_t my_intmax_t;
my_intmax_t im = INTMAX_MAX;
im = INTMAX_MIN;
typedef intptr_t my_intptr_t;
my_intptr_t ip = INTPTR_MAX;
ip = INTPTR_MIN;
typedef uint8_t my_uint8_t;
my_uint8_t ui8 = UINT8_MAX;
ui8 = UINT8_MAX;
typedef uint16_t my_uint16_t;
my_uint16_t ui16 = UINT16_MAX;
ui16 = UINT16_MAX;
typedef uint32_t my_uint32_t;
my_uint32_t ui32 = UINT32_MAX;
ui32 = UINT32_MAX;
typedef uint64_t my_uint64_t;
my_uint64_t ui64 = UINT64_MAX;
ui64 = UINT64_MAX;
typedef uint_fast8_t my_uint_fast8_t;
my_uint_fast8_t uif8 = UINT_FAST8_MAX;
uif8 = UINT_FAST8_MAX;
typedef uint_fast16_t my_uint_fast16_t;
my_uint_fast16_t uif16 = UINT_FAST16_MAX;
uif16 = UINT_FAST16_MAX;
typedef uint_fast32_t my_uint_fast32_t;
my_uint_fast32_t uif32 = UINT_FAST32_MAX;
uif32 = UINT_FAST32_MAX;
typedef uint_fast64_t my_uint_fast64_t;
my_uint_fast64_t uif64 = UINT_FAST64_MAX;
uif64 = UINT_FAST64_MAX;
typedef uint_least8_t my_uint_least8_t;
my_uint_least8_t uil8 = UINT_LEAST8_MAX;
uil8 = UINT_LEAST8_MAX;
typedef uint_least16_t my_uint_least16_t;
my_uint_least16_t uil16 = UINT_LEAST16_MAX;
uil16 = UINT_LEAST16_MAX;
typedef uint_least32_t my_uint_least32_t;
my_uint_least32_t uil32 = UINT_LEAST32_MAX;
uil32 = UINT_LEAST32_MAX;
typedef uint_least64_t my_uint_least64_t;
my_uint_least64_t uil64 = UINT_LEAST64_MAX;
uil64 = UINT_LEAST64_MAX;
typedef uintmax_t my_uintmax_t;
my_uintmax_t uim = UINTMAX_MAX;
uim = UINTMAX_MAX;
typedef uintptr_t my_uintptr_t;
my_uintptr_t uip = UINTPTR_MAX;
uip = UINTPTR_MAX;
],[glibcxx_cv_c99_stdint_tr1=yes],
[glibcxx_cv_c99_stdint_tr1=no])
])
if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
[Define if C99 types in <stdint.h> should be imported in
<tr1/cstdint> in namespace std::tr1.])
fi
# Check for the existence of <math.h> functions.
AC_CACHE_CHECK([for ISO C99 support to TR1 in <math.h>],
glibcxx_cv_c99_math_tr1, [
AC_TRY_COMPILE([#include <math.h>],
[typedef double_t my_double_t;
typedef float_t my_float_t;
acosh(0.0);
acoshf(0.0f);
acoshl(0.0l);
asinh(0.0);
asinhf(0.0f);
asinhl(0.0l);
atanh(0.0);
atanhf(0.0f);
atanhl(0.0l);
cbrt(0.0);
cbrtf(0.0f);
cbrtl(0.0l);
copysign(0.0, 0.0);
copysignf(0.0f, 0.0f);
copysignl(0.0l, 0.0l);
erf(0.0);
erff(0.0f);
erfl(0.0l);
erfc(0.0);
erfcf(0.0f);
erfcl(0.0l);
exp2(0.0);
exp2f(0.0f);
exp2l(0.0l);
expm1(0.0);
expm1f(0.0f);
expm1l(0.0l);
fdim(0.0, 0.0);
fdimf(0.0f, 0.0f);
fdiml(0.0l, 0.0l);
fma(0.0, 0.0, 0.0);
fmaf(0.0f, 0.0f, 0.0f);
fmal(0.0l, 0.0l, 0.0l);
fmax(0.0, 0.0);
fmaxf(0.0f, 0.0f);
fmaxl(0.0l, 0.0l);
fmin(0.0, 0.0);
fminf(0.0f, 0.0f);
fminl(0.0l, 0.0l);
hypot(0.0, 0.0);
hypotf(0.0f, 0.0f);
hypotl(0.0l, 0.0l);
ilogb(0.0);
ilogbf(0.0f);
ilogbl(0.0l);
lgamma(0.0);
lgammaf(0.0f);
lgammal(0.0l);
#ifndef __APPLE__ /* see below */
llrint(0.0);
llrintf(0.0f);
llrintl(0.0l);
llround(0.0);
llroundf(0.0f);
llroundl(0.0l);
#endif
log1p(0.0);
log1pf(0.0f);
log1pl(0.0l);
log2(0.0);
log2f(0.0f);
log2l(0.0l);
logb(0.0);
logbf(0.0f);
logbl(0.0l);
lrint(0.0);
lrintf(0.0f);
lrintl(0.0l);
lround(0.0);
lroundf(0.0f);
lroundl(0.0l);
nan(0);
nanf(0);
nanl(0);
nearbyint(0.0);
nearbyintf(0.0f);
nearbyintl(0.0l);
nextafter(0.0, 0.0);
nextafterf(0.0f, 0.0f);
nextafterl(0.0l, 0.0l);
nexttoward(0.0, 0.0);
nexttowardf(0.0f, 0.0f);
nexttowardl(0.0l, 0.0l);
remainder(0.0, 0.0);
remainderf(0.0f, 0.0f);
remainderl(0.0l, 0.0l);
remquo(0.0, 0.0, 0);
remquof(0.0f, 0.0f, 0);
remquol(0.0l, 0.0l, 0);
rint(0.0);
rintf(0.0f);
rintl(0.0l);
round(0.0);
roundf(0.0f);
roundl(0.0l);
scalbln(0.0, 0l);
scalblnf(0.0f, 0l);
scalblnl(0.0l, 0l);
scalbn(0.0, 0);
scalbnf(0.0f, 0);
scalbnl(0.0l, 0);
tgamma(0.0);
tgammaf(0.0f);
tgammal(0.0l);
trunc(0.0);
truncf(0.0f);
truncl(0.0l);
],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
])
if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
[Define if C99 functions or macros in <math.h> should be imported
in <tr1/cmath> in namespace std::tr1.])
case "${target_os}" in
darwin*)
AC_CACHE_CHECK([for ISO C99 rounding functions in <math.h>],
glibcxx_cv_c99_math_llround, [
AC_TRY_COMPILE([#include <math.h>],
[llrint(0.0);
llrintf(0.0f);
llrintl(0.0l);
llround(0.0);
llroundf(0.0f);
llroundl(0.0l);
],
[glibcxx_cv_c99_math_llround=yes],
[glibcxx_cv_c99_math_llround=no])
])
;;
esac
if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
[Define if C99 llrint and llround functions are missing from <math.h>.])
fi
fi
# Check for the existence of <inttypes.h> functions (NB: doesn't make
# sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
ac_c99_inttypes_tr1=no;
if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
AC_TRY_COMPILE([#include <inttypes.h>],
[intmax_t i, numer, denom, base;
const char* s;
char** endptr;
intmax_t ret = imaxabs(i);
imaxdiv_t dret = imaxdiv(numer, denom);
ret = strtoimax(s, endptr, base);
uintmax_t uret = strtoumax(s, endptr, base);
],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
AC_MSG_RESULT($ac_c99_inttypes_tr1)
fi
if test x"$ac_c99_inttypes_tr1" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
[Define if C99 functions in <inttypes.h> should be imported in
<tr1/cinttypes> in namespace std::tr1.])
fi
# Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
# make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
ac_c99_inttypes_wchar_t_tr1=no;
if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
AC_TRY_COMPILE([#include <inttypes.h>],
[intmax_t base;
const wchar_t* s;
wchar_t** endptr;
intmax_t ret = wcstoimax(s, endptr, base);
uintmax_t uret = wcstoumax(s, endptr, base);
],[ac_c99_inttypes_wchar_t_tr1=yes],
[ac_c99_inttypes_wchar_t_tr1=no])
AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
fi
if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
[Define if wchar_t C99 functions in <inttypes.h> should be
imported in <tr1/cinttypes> in namespace std::tr1.])
fi
# Check for the existence of the <stdbool.h> header.
AC_CHECK_HEADERS(stdbool.h)
# Check for the existence of the <stdalign.h> header.
AC_CHECK_HEADERS(stdalign.h)
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check for uchar.h and usability.
dnl
AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
# Test uchar.h.
AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++11"
if test x"$ac_has_uchar_h" = x"yes"; then
AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
AC_TRY_COMPILE([#include <uchar.h>
#ifdef __STDC_UTF_16__
long i = __STDC_UTF_16__;
#endif
#ifdef __STDC_UTF_32__
long j = __STDC_UTF_32__;
#endif
namespace test
{
using ::c16rtomb;
using ::c32rtomb;
using ::mbrtoc16;
using ::mbrtoc32;
}
],
[], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
AC_MSG_RESULT($ac_c11_uchar_cxx11)
else
ac_c11_uchar_cxx11=no
fi
if test x"$ac_c11_uchar_cxx11" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
[Define if C11 functions in <uchar.h> should be imported into
namespace std in <cuchar>.])
fi
CXXFLAGS="$CXXFLAGS -fchar8_t"
if test x"$ac_has_uchar_h" = x"yes"; then
AC_MSG_CHECKING([for c8rtomb and mbrtoc8 in <uchar.h> with -fchar8_t])
AC_TRY_COMPILE([#include <uchar.h>
namespace test
{
using ::c8rtomb;
using ::mbrtoc8;
}
],
[], [ac_uchar_c8rtomb_mbrtoc8_fchar8_t=yes],
[ac_uchar_c8rtomb_mbrtoc8_fchar8_t=no])
else
ac_uchar_c8rtomb_mbrtoc8_fchar8_t=no
fi
AC_MSG_RESULT($ac_uchar_c8rtomb_mbrtoc8_fchar8_t)
if test x"$ac_uchar_c8rtomb_mbrtoc8_fchar8_t" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_FCHAR8_T, 1,
[Define if c8rtomb and mbrtoc8 functions in <uchar.h> should be
imported into namespace std in <cuchar> for -fchar8_t.])
fi
CXXFLAGS="$CXXFLAGS -std=c++20"
if test x"$ac_has_uchar_h" = x"yes"; then
AC_MSG_CHECKING([for c8rtomb and mbrtoc8 in <uchar.h> with -std=c++20])
AC_TRY_COMPILE([#include <uchar.h>
namespace test
{
using ::c8rtomb;
using ::mbrtoc8;
}
],
[], [ac_uchar_c8rtomb_mbrtoc8_cxx20=yes],
[ac_uchar_c8rtomb_mbrtoc8_cxx20=no])
else
ac_uchar_c8rtomb_mbrtoc8_cxx20=no
fi
AC_MSG_RESULT($ac_uchar_c8rtomb_mbrtoc8_cxx20)
if test x"$ac_uchar_c8rtomb_mbrtoc8_cxx20" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_CXX20, 1,
[Define if c8rtomb and mbrtoc8 functions in <uchar.h> should be
imported into namespace std in <cuchar> for C++20.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check whether "/dev/random" and "/dev/urandom" are available for
dnl class std::random_device from C++ 2011 [rand.device], and
dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
dnl
AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
AC_CACHE_CHECK([for "/dev/random" and "/dev/urandom" for std::random_device],
glibcxx_cv_dev_random, [
if test -r /dev/random && test -r /dev/urandom; then
## For MSys environment the test above is detected as false-positive
## on mingw-targets. So disable it explicitly for them.
case ${target_os} in
*mingw*) glibcxx_cv_dev_random=no ;;
*) glibcxx_cv_dev_random=yes ;;
esac
else
glibcxx_cv_dev_random=no;
fi
])
if test x"$glibcxx_cv_dev_random" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
[Define if /dev/random and /dev/urandom are available for
std::random_device.])
AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
[Define if /dev/random and /dev/urandom are available for
the random_device of TR1 (Chapter 5.1).])
fi
])
dnl
dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
dnl
AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
if test "$is_hosted" = yes; then
AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
[#include <stdio.h>],
[AC_MSG_ERROR([computing EOF failed])])
])
AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
[Define to the value of the EOF integer constant.])
AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
[#include <stdio.h>],
[AC_MSG_ERROR([computing SEEK_CUR failed])])
])
AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
[Define to the value of the SEEK_CUR integer constant.])
AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
[#include <stdio.h>],
[AC_MSG_ERROR([computing SEEK_END failed])])
])
AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
[Define to the value of the SEEK_END integer constant.])
fi
])
dnl
dnl Check whether required C++ overloads are present in <stdio.h>.
dnl
AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
# Use C++11 because a conforming <stdio.h> won't define gets for C++14,
# and we don't need a declaration for C++14 anyway.
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=gnu++11"
AC_CACHE_CHECK([for gets declaration], glibcxx_cv_gets, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[#include <stdio.h>
namespace test
{
using ::gets;
}
])],
[glibcxx_cv_gets=yes],
[glibcxx_cv_gets=no]
)])
if test $glibcxx_cv_gets = yes; then
AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check whether required C++11 overloads for floating point and integral
dnl types are present in <math.h>.
dnl
AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++11"
case "$host" in
*-*-solaris2.*)
# Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
# 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
AC_CACHE_CHECK([for C++11 <math.h> floating point overloads],
glibcxx_cv_math11_fp_overload, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[#include <math.h>
#undef isfinite
namespace std {
inline bool isfinite(float __x)
{ return __builtin_isfinite(__x); }
}
])],
[glibcxx_cv_math11_fp_overload=no],
[glibcxx_cv_math11_fp_overload=yes]
)])
# autoheader cannot handle indented templates.
AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
[/* Define if all C++11 floating point overloads are available in <math.h>. */
#if __cplusplus >= 201103L
#undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
#endif])
if test $glibcxx_cv_math11_fp_overload = yes; then
AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
fi
# Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
# 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
AC_CACHE_CHECK([for C++11 <math.h> integral type overloads],
glibcxx_cv_math11_int_overload, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[#include <math.h>
namespace std {
template<typename _Tp>
struct __is_integer;
template<>
struct __is_integer<int>
{
enum { __value = 1 };
};
}
namespace __gnu_cxx {
template<bool, typename>
struct __enable_if;
template<typename _Tp>
struct __enable_if<true, _Tp>
{ typedef _Tp __type; };
}
namespace std {
template<typename _Tp>
constexpr typename __gnu_cxx::__enable_if
<__is_integer<_Tp>::__value, double>::__type
log2(_Tp __x)
{ return __builtin_log2(__x); }
}
int
main (void)
{
int i = 1000;
return std::log2(i);
}
])],
[glibcxx_cv_math11_int_overload=no],
[glibcxx_cv_math11_int_overload=yes]
)])
# autoheader cannot handle indented templates.
AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
[/* Define if all C++11 integral type overloads are available in <math.h>. */
#if __cplusplus >= 201103L
#undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
#endif])
if test $glibcxx_cv_math11_int_overload = yes; then
AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
fi
;;
*)
# If <math.h> defines the obsolete isinf(double) and isnan(double)
# functions (instead of or as well as the C99 generic macros) then we
# can't define std::isinf(double) and std::isnan(double) in <cmath>
# and must use the ones from <math.h> instead.
AC_CACHE_CHECK([for obsolete isinf function in <math.h>],
glibcxx_cv_obsolete_isinf, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
#include <math.h>
#undef isinf
namespace std {
using ::isinf;
bool isinf(float);
bool isinf(long double);
}
using std::isinf;
bool b = isinf(0.0);
])],
[glibcxx_cv_obsolete_isinf=yes],
[glibcxx_cv_obsolete_isinf=no]
)])
if test $glibcxx_cv_obsolete_isinf = yes; then
AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
[Define if <math.h> defines obsolete isinf function.])
fi
AC_CACHE_CHECK([for obsolete isnan function in <math.h>],
glibcxx_cv_obsolete_isnan, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
#include <math.h>
#undef isnan
namespace std {
using ::isnan;
bool isnan(float);
bool isnan(long double);
}
using std::isnan;
bool b = isnan(0.0);
])],
[glibcxx_cv_obsolete_isnan=yes],
[glibcxx_cv_obsolete_isnan=no]
)])
if test $glibcxx_cv_obsolete_isnan = yes; then
AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
[Define if <math.h> defines obsolete isnan function.])
fi
;;
esac
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check for what type of C headers to use.
dnl
dnl --enable-cheaders= [does stuff].
dnl --disable-cheaders [does not do anything, really].
dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
dnl Where DEFAULT is either 'c' or 'c_global' or 'c_std'.
dnl
dnl To use the obsolete 'c_std' headers use --enable-cheaders-obsolete as
dnl well as --enable-cheaders=c_std, otherwise configure will fail.
dnl
AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
GLIBCXX_ENABLE(cheaders-obsolete,no,,
[allow use of obsolete "C" headers for g++])
GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
[construct "C" headers for g++], [permit c|c_global|c_std])
AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
if test $enable_cheaders = c_std ; then
AC_MSG_WARN([the --enable-cheaders=c_std configuration is obsolete, c_global should be used instead])
AC_MSG_WARN([if you are unable to use c_global please report a bug or inform libstdc++@gcc.gnu.org])
if test $enable_cheaders_obsolete != yes ; then
AC_MSG_ERROR(use --enable-cheaders-obsolete to use c_std "C" headers)
fi
fi
C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
# Allow overrides to configure.host here.
if test $enable_cheaders = c_global; then
c_compatibility=yes
fi
AC_SUBST(C_INCLUDE_DIR)
GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
])
dnl
dnl Check for which locale library to use. The choice is mapped to
dnl a subdirectory of config/locale.
dnl
dnl Default is generic.
dnl
AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
[use MODEL for target locale package],
[permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
# Deal with gettext issues. Default to not using it (=no) until we detect
# support for it later. Let the user turn it off via --e/d, but let that
# default to on for easier handling.
USE_NLS=no
AC_ARG_ENABLE(nls,
AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
[],
[enable_nls=yes])
# Either a known package, or "auto"
if test $enable_clocale = no || test $enable_clocale = yes; then
enable_clocale=auto
fi
enable_clocale_flag=$enable_clocale
# Probe for locale model to use if none specified.
# Default to "generic".
if test $enable_clocale_flag = auto; then
case ${target_os} in
linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
enable_clocale_flag=gnu
;;
darwin*)
enable_clocale_flag=darwin
;;
vxworks*)
enable_clocale_flag=vxworks
;;
dragonfly* | freebsd*)
enable_clocale_flag=dragonfly
;;
openbsd*)
enable_clocale_flag=newlib
;;
*)
if test x"$with_newlib" = x"yes"; then
enable_clocale_flag=newlib
else
enable_clocale_flag=generic
fi
;;
esac
fi
# Sanity check model, and test for special functionality.
if test $enable_clocale_flag = gnu; then
AC_EGREP_CPP([_GLIBCXX_ok], [
#include <features.h>
#if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
_GLIBCXX_ok
#endif
], enable_clocale_flag=gnu, enable_clocale_flag=generic)
# Set it to scream when it hurts.
ac_save_CFLAGS="$CFLAGS"
CFLAGS="-Wimplicit-function-declaration -Werror"
# Use strxfrm_l if available.
AC_TRY_COMPILE([#define _GNU_SOURCE 1
#include <string.h>
#include <locale.h>],
[char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
AC_DEFINE(HAVE_STRXFRM_L, 1,
[Define if strxfrm_l is available in <string.h>.]),)
# Use strerror_l if available.
AC_TRY_COMPILE([#define _GNU_SOURCE 1
#include <string.h>
#include <locale.h>],
[__locale_t loc; strerror_l(5, loc);],
AC_DEFINE(HAVE_STRERROR_L, 1,
[Define if strerror_l is available in <string.h>.]),)
CFLAGS="$ac_save_CFLAGS"
fi
# Perhaps use strerror_r if available, and strerror_l isn't.
ac_save_CFLAGS="$CFLAGS"
CFLAGS="-Wimplicit-function-declaration -Werror"
AC_TRY_COMPILE([#define _GNU_SOURCE 1
#include <string.h>
#include <locale.h>],
[char s[128]; strerror_r(5, s, 128);],
AC_DEFINE(HAVE_STRERROR_R, 1,
[Define if strerror_r is available in <string.h>.]),)
CFLAGS="$ac_save_CFLAGS"
# Set configure bits for specified locale package
AC_MSG_CHECKING([for C locale to use])
case ${enable_clocale_flag} in
generic)
AC_MSG_RESULT(generic)
CLOCALE_H=config/locale/generic/c_locale.h
CLOCALE_CC=config/locale/generic/c_locale.cc
CCODECVT_CC=config/locale/generic/codecvt_members.cc
CCOLLATE_CC=config/locale/generic/collate_members.cc
CCTYPE_CC=config/locale/generic/ctype_members.cc
CMESSAGES_H=config/locale/generic/messages_members.h
CMESSAGES_CC=config/locale/generic/messages_members.cc
CMONEY_CC=config/locale/generic/monetary_members.cc
CNUMERIC_CC=config/locale/generic/numeric_members.cc
CTIME_H=config/locale/generic/time_members.h
CTIME_CC=config/locale/generic/time_members.cc
CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
;;
darwin)
AC_MSG_RESULT(darwin)
CLOCALE_H=config/locale/generic/c_locale.h
CLOCALE_CC=config/locale/generic/c_locale.cc
CCODECVT_CC=config/locale/generic/codecvt_members.cc
CCOLLATE_CC=config/locale/generic/collate_members.cc
CCTYPE_CC=config/locale/darwin/ctype_members.cc
CMESSAGES_H=config/locale/generic/messages_members.h
CMESSAGES_CC=config/locale/generic/messages_members.cc
CMONEY_CC=config/locale/generic/monetary_members.cc
CNUMERIC_CC=config/locale/generic/numeric_members.cc
CTIME_H=config/locale/generic/time_members.h
CTIME_CC=config/locale/generic/time_members.cc
CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
;;
vxworks)
AC_MSG_RESULT(vxworks)
CLOCALE_H=config/locale/generic/c_locale.h
CLOCALE_CC=config/locale/generic/c_locale.cc
CCODECVT_CC=config/locale/generic/codecvt_members.cc
CCOLLATE_CC=config/locale/generic/collate_members.cc
CCTYPE_CC=config/locale/vxworks/ctype_members.cc
CMESSAGES_H=config/locale/generic/messages_members.h
CMESSAGES_CC=config/locale/generic/messages_members.cc
CMONEY_CC=config/locale/generic/monetary_members.cc
CNUMERIC_CC=config/locale/generic/numeric_members.cc
CTIME_H=config/locale/generic/time_members.h
CTIME_CC=config/locale/generic/time_members.cc
CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
;;
dragonfly)
AC_MSG_RESULT(dragonfly or freebsd)
CLOCALE_H=config/locale/dragonfly/c_locale.h
CLOCALE_CC=config/locale/dragonfly/c_locale.cc
CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
CMESSAGES_H=config/locale/generic/messages_members.h
CMESSAGES_CC=config/locale/generic/messages_members.cc
CMONEY_CC=config/locale/dragonfly/monetary_members.cc
CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
CTIME_H=config/locale/dragonfly/time_members.h
CTIME_CC=config/locale/dragonfly/time_members.cc
CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
;;
gnu)
AC_MSG_RESULT(gnu)
# Declare intention to use gettext, and add support for specific
# languages.
# For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
ALL_LINGUAS="de fr"
# Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
USE_NLS=yes
fi
# Export the build objects.
for ling in $ALL_LINGUAS; do \
glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
done
AC_SUBST(glibcxx_MOFILES)
AC_SUBST(glibcxx_POFILES)
CLOCALE_H=config/locale/gnu/c_locale.h
CLOCALE_CC=config/locale/gnu/c_locale.cc
CCODECVT_CC=config/locale/gnu/codecvt_members.cc
CCOLLATE_CC=config/locale/gnu/collate_members.cc
CCTYPE_CC=config/locale/gnu/ctype_members.cc
CMESSAGES_H=config/locale/gnu/messages_members.h
CMESSAGES_CC=config/locale/gnu/messages_members.cc
CMONEY_CC=config/locale/gnu/monetary_members.cc
CNUMERIC_CC=config/locale/gnu/numeric_members.cc
CTIME_H=config/locale/gnu/time_members.h
CTIME_CC=config/locale/gnu/time_members.cc
CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
;;
ieee_1003.1-2001)
AC_MSG_RESULT(IEEE 1003.1)
CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
CCODECVT_CC=config/locale/generic/codecvt_members.cc
CCOLLATE_CC=config/locale/generic/collate_members.cc
CCTYPE_CC=config/locale/generic/ctype_members.cc
CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
CMONEY_CC=config/locale/generic/monetary_members.cc
CNUMERIC_CC=config/locale/generic/numeric_members.cc
CTIME_H=config/locale/generic/time_members.h
CTIME_CC=config/locale/generic/time_members.cc
CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
;;
newlib)
AC_MSG_RESULT(newlib)
CLOCALE_H=config/locale/generic/c_locale.h
CLOCALE_CC=config/locale/generic/c_locale.cc
CCODECVT_CC=config/locale/generic/codecvt_members.cc
CCOLLATE_CC=config/locale/generic/collate_members.cc
CCTYPE_CC=config/locale/newlib/ctype_members.cc
CMESSAGES_H=config/locale/generic/messages_members.h
CMESSAGES_CC=config/locale/generic/messages_members.cc
CMONEY_CC=config/locale/generic/monetary_members.cc
CNUMERIC_CC=config/locale/generic/numeric_members.cc
CTIME_H=config/locale/generic/time_members.h
CTIME_CC=config/locale/generic/time_members.cc
CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
;;
esac
# This is where the testsuite looks for locale catalogs, using the
# -DLOCALEDIR define during testsuite compilation.
glibcxx_localedir=${glibcxx_builddir}/po/share/locale
AC_SUBST(glibcxx_localedir)
# A standalone libintl (e.g., GNU libintl) may be in use.
if test $USE_NLS = yes; then
AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
fi
if test $USE_NLS = yes; then
AC_DEFINE(_GLIBCXX_USE_NLS, 1,
[Define if NLS translations are to be used.])
fi
AC_SUBST(USE_NLS)
AC_SUBST(CLOCALE_H)
AC_SUBST(CMESSAGES_H)
AC_SUBST(CCODECVT_CC)
AC_SUBST(CCOLLATE_CC)
AC_SUBST(CCTYPE_CC)
AC_SUBST(CMESSAGES_CC)
AC_SUBST(CMONEY_CC)
AC_SUBST(CNUMERIC_CC)
AC_SUBST(CTIME_H)
AC_SUBST(CTIME_CC)
AC_SUBST(CLOCALE_CC)
AC_SUBST(CLOCALE_INTERNAL_H)
])
dnl
dnl Check for which std::allocator base class to use. The choice is
dnl mapped from a subdirectory of include/ext.
dnl
dnl Default is new.
dnl
AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
AC_MSG_CHECKING([for std::allocator base class])
GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
[use KIND for target std::allocator base],
[permit new|malloc|yes|no|auto])
# If they didn't use this option switch, or if they specified --enable
# with no specific model, we'll have to look for one. If they
# specified --disable (???), do likewise.
if test $enable_libstdcxx_allocator = no ||
test $enable_libstdcxx_allocator = yes;
then
enable_libstdcxx_allocator=auto
fi
# Either a known package, or "auto". Auto implies the default choice
# for a particular platform.
enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
# Probe for host-specific support if no specific model is specified.
# Default to "new".
if test $enable_libstdcxx_allocator_flag = auto; then
case ${target_os} in
linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
enable_libstdcxx_allocator_flag=new
;;
*)
enable_libstdcxx_allocator_flag=new
;;
esac
fi
AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
# Set configure bits for specified locale package
case ${enable_libstdcxx_allocator_flag} in
malloc)
ALLOCATOR_H=config/allocator/malloc_allocator_base.h
ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
;;
new)
ALLOCATOR_H=config/allocator/new_allocator_base.h
ALLOCATOR_NAME=__gnu_cxx::new_allocator
;;
esac
GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
test $enable_libstdcxx_allocator_flag = new)
AC_SUBST(ALLOCATOR_H)
AC_SUBST(ALLOCATOR_NAME)
])
dnl
dnl Check for whether the Boost-derived checks should be turned on.
dnl
dnl --enable-concept-checks turns them on.
dnl --disable-concept-checks leaves them off.
dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
dnl Where DEFAULT is either `yes' or `no'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
if test $enable_concept_checks = yes; then
AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
[Define to use concept checking code from the boost libraries.])
fi
])
dnl
dnl Use extern templates.
dnl
dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
dnl Where DEFAULT is `yes' or `no'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
AC_MSG_CHECKING([for extern template support])
AC_MSG_RESULT([$enable_extern_template])
GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
])
dnl
dnl Use vtable verification.
dnl
dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
dnl Where DEFAULT is `yes' or `no'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
AC_MSG_CHECKING([for vtable verify support])
AC_MSG_RESULT([$enable_vtable_verify])
vtv_cygmin=no
if test $enable_vtable_verify = yes; then
case ${target_os} in
cygwin*|mingw32*)
VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
vtv_cygmin=yes
;;
darwin*)
VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
;;
solaris2*)
VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
;;
*)
VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
;;
esac
VTV_PCH_CXXFLAGS="-fvtable-verify=std"
else
VTV_CXXFLAGS=
VTV_PCH_CXXFLAGS=
VTV_CXXLINKFLAGS=
fi
AC_SUBST(VTV_CXXFLAGS)
AC_SUBST(VTV_PCH_CXXFLAGS)
AC_SUBST(VTV_CXXLINKFLAGS)
AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
])
dnl
dnl Check for parallel mode pre-requisites, including OpenMP support.
dnl
dnl + Usage: GLIBCXX_ENABLE_PARALLEL
dnl
AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
enable_parallel=no;
# See if configured libgomp/omp.h exists. (libgomp may be in
# noconfigdirs but not explicitly disabled.)
if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
enable_parallel=yes;
else
AC_MSG_NOTICE([target-libgomp not built])
fi
AC_MSG_CHECKING([for parallel mode support])
AC_MSG_RESULT([$enable_parallel])
])
dnl
dnl Check for which I/O library to use: stdio and POSIX, or pure stdio.
dnl
dnl Default is stdio_posix.
dnl
AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
AC_MSG_CHECKING([for underlying I/O to use])
GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
[use target-specific I/O package], [permit stdio|stdio_posix|stdio_pure])
# The only available I/O model is based on stdio, via basic_file_stdio.
# The default "stdio" is actually "stdio + POSIX" because it uses fdopen(3)
# to get a file descriptor and then uses read(3) and write(3) with it.
# The "stdio_pure" model doesn't use fdopen and only uses FILE* for I/O.
case ${enable_cstdio} in
stdio*)
CSTDIO_H=config/io/c_io_stdio.h
BASIC_FILE_H=config/io/basic_file_stdio.h
BASIC_FILE_CC=config/io/basic_file_stdio.cc
if test "x$enable_cstdio" = "xstdio_pure" ; then
AC_MSG_RESULT([stdio (without POSIX read/write)])
AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
[Define to restrict std::__basic_file<> to stdio APIs.])
else
AC_MSG_RESULT([stdio (with POSIX read/write)])
fi
;;
esac
AC_SUBST(CSTDIO_H)
AC_SUBST(BASIC_FILE_H)
AC_SUBST(BASIC_FILE_CC)
])
dnl
dnl Check for "unusual" flags to pass to the compiler while building.
dnl
dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
dnl --disable-cxx-flags passes nothing.
dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
dnl If "default flags" is an empty string, the effect is the same
dnl as --disable or --enable=no.
dnl
AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
AC_MSG_CHECKING([for extra compiler flags for building])
GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
[pass compiler FLAGS when building library],
[case "x$enable_cxx_flags" in
xno | x) enable_cxx_flags= ;;
x-*) ;;
*) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
esac])
# Run through flags (either default or command-line) and set anything
# extra (e.g., #defines) that must accompany particular g++ options.
if test -n "$enable_cxx_flags"; then
for f in $enable_cxx_flags; do
case "$f" in
-fhonor-std) ;;
-*) ;;
*) # and we're trying to pass /what/ exactly?
AC_MSG_ERROR([compiler flags start with a -]) ;;
esac
done
fi
EXTRA_CXX_FLAGS="$enable_cxx_flags"
AC_MSG_RESULT($EXTRA_CXX_FLAGS)
AC_SUBST(EXTRA_CXX_FLAGS)
])
dnl
dnl Check to see if debugging libraries are to be built.
dnl
dnl --enable-libstdcxx-debug
dnl builds a separate set of debugging libraries in addition to the
dnl normal (shared, static) libstdc++ binaries.
dnl
dnl --disable-libstdcxx-debug
dnl builds only one (non-debug) version of libstdc++.
dnl
dnl --enable-libstdcxx-debug-flags=FLAGS
dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
dnl
dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
dnl Where DEFAULT is either `yes' or `no'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
AC_MSG_CHECKING([for additional debug build])
skip_debug_build=
GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
if test x$enable_libstdcxx_debug = xyes; then
if test -f $toplevel_builddir/../stage_final \
&& test -f $toplevel_builddir/../stage_current; then
stage_final=`cat $toplevel_builddir/../stage_final`
stage_current=`cat $toplevel_builddir/../stage_current`
if test x$stage_current != x$stage_final ; then
skip_debug_build=" (skipped for bootstrap stage $stage_current)"
enable_libstdcxx_debug=no
fi
fi
fi
AC_MSG_RESULT($enable_libstdcxx_debug$skip_debug_build)
GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
])
dnl
dnl Check for explicit debug flags.
dnl
dnl --enable-libstdcxx-debug-flags='-O1'
dnl is a general method for passing flags to be used when
dnl building debug libraries with --enable-libstdcxx-debug.
dnl
dnl --disable-libstdcxx-debug-flags does nothing.
dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
dnl If "default flags" is an empty string, the effect is the same
dnl as --disable or --enable=no.
dnl
AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
[pass compiler FLAGS when building debug library],
[case "x$enable_libstdcxx_debug_flags" in
xno | x) enable_libstdcxx_debug_flags= ;;
x-*) ;;
*) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
esac])
# Option parsed, now set things appropriately
DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
AC_SUBST(DEBUG_FLAGS)
AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
])
dnl
dnl Check if the user only wants a freestanding library implementation.
dnl
dnl --disable-hosted-libstdcxx will turn off most of the library build,
dnl installing only the headers required by [17.4.1.3] and the language
dnl support library. More than that will be built (to keep the Makefiles
dnl conveniently clean), but not installed.
dnl
dnl Sets:
dnl is_hosted (yes/no)
dnl
dnl Defines:
dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
dnl
AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
AC_ARG_ENABLE([hosted-libstdcxx],
AC_HELP_STRING([--disable-hosted-libstdcxx],
[only build freestanding C++ runtime support]),,
[case "$host" in
arm*-*-symbianelf*)
enable_hosted_libstdcxx=no
;;
*)
enable_hosted_libstdcxx=yes
;;
esac])
freestanding_flags=
if test "$enable_hosted_libstdcxx" = no; then
AC_MSG_NOTICE([Only freestanding libraries will be built])
is_hosted=no
hosted_define=0
enable_abi_check=no
enable_libstdcxx_pch=no
if test "x$with_headers" = xno; then
freestanding_flags="-ffreestanding"
fi
else
is_hosted=yes
hosted_define=1
fi
GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
[Define to 1 if a full hosted library is built, or 0 if freestanding.])
FREESTANDING_FLAGS="$freestanding_flags"
AC_SUBST(FREESTANDING_FLAGS)
])
dnl
dnl Check if the user wants a non-verbose library implementation.
dnl
dnl --disable-libstdcxx-verbose will turn off descriptive messages to
dnl standard error on termination.
dnl
dnl Defines:
dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
dnl
AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
AC_ARG_ENABLE([libstdcxx-verbose],
AC_HELP_STRING([--disable-libstdcxx-verbose],
[disable termination messages to standard error]),,
[enable_libstdcxx_verbose=yes])
if test x"$enable_libstdcxx_verbose" = xyes; then
verbose_define=1
else
AC_MSG_NOTICE([verbose termination messages are disabled])
verbose_define=0
fi
AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
[Define to 1 if a verbose library is built, or 0 otherwise.])
])
dnl
dnl Check for template specializations for the 'long long' type.
dnl The result determines only whether 'long long' I/O is enabled; things
dnl like numeric_limits<> specializations are always available.
dnl
dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
dnl Where DEFAULT is either `yes' or `no'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
if test $enable_long_long = yes; then
AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
[Define if code specialized for long long should be used.])
fi
AC_MSG_CHECKING([for enabled long long specializations])
AC_MSG_RESULT([$enable_long_long])
])
dnl
dnl Check for decimal floating point.
dnl See:
dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
dnl
dnl This checks to see if the host supports decimal floating point types.
dnl
dnl Defines:
dnl _GLIBCXX_USE_DECIMAL_FLOAT
dnl
AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
# Fake what AC_TRY_COMPILE does, without linking as this is
# unnecessary for this test.
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
int main()
{
_Decimal32 d1;
_Decimal64 d2;
_Decimal128 d3;
return 0;
}
EOF
AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
if AC_TRY_EVAL(ac_compile); then
AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
[Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
enable_dfp=yes
else
enable_dfp=no
fi
AC_MSG_RESULT($enable_dfp)
rm -f conftest*
])
dnl
dnl Check for GNU 128-bit floating point type.
dnl
dnl Note: also checks that the type isn't a standard types.
dnl
dnl Defines:
dnl ENABLE_FLOAT128
dnl
AC_DEFUN([GLIBCXX_ENABLE_FLOAT128], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
# Fake what AC_TRY_COMPILE does, without linking as this is
# unnecessary for this test.
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
template<typename T1, typename T2>
struct same
{ typedef T2 type; };
template<typename T>
struct same<T, T>;
int main()
{
typename same<double, __float128>::type f1;
typename same<long double, __float128>::type f2;
}
EOF
AC_MSG_CHECKING([for __float128])
if AC_TRY_EVAL(ac_compile); then
enable_float128=yes
else
enable_float128=no
fi
AC_MSG_RESULT($enable_float128)
GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
rm -f conftest*
AC_LANG_RESTORE
])
dnl
dnl Check for template specializations for the 'wchar_t' type.
dnl
dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
dnl Where DEFAULT is either `yes' or `no'.
dnl
dnl Necessary support must also be present.
dnl
AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
# Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
AC_MSG_CHECKING([for mbstate_t])
AC_TRY_COMPILE([#include <wchar.h>],
[mbstate_t teststate;],
have_mbstate_t=yes, have_mbstate_t=no)
AC_MSG_RESULT($have_mbstate_t)
if test x"$have_mbstate_t" = xyes; then
AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
fi
# Test it always, for use in GLIBCXX_ENABLE_C99, together with
# ac_has_wchar_h.
AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
if test x"$enable_wchar_t" = x"yes"; then
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
if test x"$ac_has_wchar_h" = xyes &&
test x"$ac_has_wctype_h" = xyes; then
AC_TRY_COMPILE([#include <wchar.h>
#include <stddef.h>
wint_t i;
long l = WEOF;
long j = WCHAR_MIN;
long k = WCHAR_MAX;
namespace test
{
using ::btowc;
using ::fgetwc;
using ::fgetws;
using ::fputwc;
using ::fputws;
using ::fwide;
using ::fwprintf;
using ::fwscanf;
using ::getwc;
using ::getwchar;
using ::mbrlen;
using ::mbrtowc;
using ::mbsinit;
using ::mbsrtowcs;
using ::putwc;
using ::putwchar;
using ::swprintf;
using ::swscanf;
using ::ungetwc;
using ::vfwprintf;
using ::vswprintf;
using ::vwprintf;
using ::wcrtomb;
using ::wcscat;
using ::wcschr;
using ::wcscmp;
using ::wcscoll;
using ::wcscpy;
using ::wcscspn;
using ::wcsftime;
using ::wcslen;
using ::wcsncat;
using ::wcsncmp;
using ::wcsncpy;
using ::wcspbrk;
using ::wcsrchr;
using ::wcsrtombs;
using ::wcsspn;
using ::wcsstr;
using ::wcstod;
using ::wcstok;
using ::wcstol;
using ::wcstoul;
using ::wcsxfrm;
using ::wctob;
using ::wmemchr;
using ::wmemcmp;
using ::wmemcpy;
using ::wmemmove;
using ::wmemset;
using ::wprintf;
using ::wscanf;
}
],[],[], [enable_wchar_t=no])
else
enable_wchar_t=no
fi
AC_LANG_RESTORE
fi
if test x"$enable_wchar_t" = x"yes"; then
AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
[Define if code specialized for wchar_t should be used.])
fi
AC_MSG_CHECKING([for enabled wchar_t specializations])
AC_MSG_RESULT([$enable_wchar_t])
])
dnl
dnl Check to see if building and using a C++ precompiled header can be done.
dnl
dnl --enable-libstdcxx-pch=yes
dnl default, this shows intent to use stdc++.h.gch If it looks like it
dnl may work, after some light-hearted attempts to puzzle out compiler
dnl support, flip bits on in include/Makefile.am
dnl
dnl --disable-libstdcxx-pch
dnl turns off attempts to use or build stdc++.h.gch.
dnl
dnl Substs:
dnl glibcxx_PCHFLAGS
dnl
AC_DEFUN([GLIBCXX_ENABLE_PCH], [
GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
if test $enable_libstdcxx_pch = yes; then
AC_CACHE_CHECK([for compiler with PCH support],
[glibcxx_cv_prog_CXX_pch],
[ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
echo '#include <math.h>' > conftest.h
if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
-o conftest.h.gch 1>&5 2>&1 &&
echo '#error "pch failed"' > conftest.h &&
echo '#include "conftest.h"' > conftest.cc &&
$CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
then
glibcxx_cv_prog_CXX_pch=yes
else
glibcxx_cv_prog_CXX_pch=no
fi
rm -f conftest*
CXXFLAGS=$ac_save_CXXFLAGS
AC_LANG_RESTORE
])
enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
fi
AC_MSG_CHECKING([for enabled PCH])
AC_MSG_RESULT([$enable_libstdcxx_pch])
GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
if test $enable_libstdcxx_pch = yes; then
glibcxx_PCHFLAGS="-include bits/stdc++.h"
else
glibcxx_PCHFLAGS=""
fi
AC_SUBST(glibcxx_PCHFLAGS)
])
dnl
dnl Check for atomic builtins.
dnl See:
dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
dnl
dnl This checks to see if the host supports the compiler-generated
dnl builtins for atomic operations for various integral sizes. Note, this
dnl is intended to be an all-or-nothing switch, so all the atomic operations
dnl that are used should be checked.
dnl
dnl Note:
dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
dnl
AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
old_CXXFLAGS="$CXXFLAGS"
# Do link tests if possible, instead asm tests, limited to some platforms
# see discussion in PR target/40134, PR libstdc++/40133 and the thread
# starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
atomic_builtins_link_tests=no
if test x$gcc_no_link != xyes; then
# Can do link tests. Limit to some tested platforms
case "$host" in
*-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
atomic_builtins_link_tests=yes
;;
esac
fi
if test x$atomic_builtins_link_tests = xyes; then
# Do link tests.
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CACHE_CHECK([for atomic builtins for bool],
glibcxx_cv_atomic_bool, [
AC_TRY_LINK(
[ ],
[typedef bool atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
// N.B. __atomic_fetch_add is not supported for bool.
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
],
[glibcxx_cv_atomic_bool=yes],
[glibcxx_cv_atomic_bool=no])
])
AC_CACHE_CHECK([for atomic builtins for short],
glibcxx_cv_atomic_short, [
AC_TRY_LINK(
[ ],
[typedef short atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
__atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
],
[glibcxx_cv_atomic_short=yes],
[glibcxx_cv_atomic_short=no])
])
AC_CACHE_CHECK([for atomic builtins for int],
glibcxx_cv_atomic_int, [
AC_TRY_LINK(
[ ],
[typedef int atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
__atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
],
[glibcxx_cv_atomic_int=yes],
[glibcxx_cv_atomic_int=no])
])
AC_CACHE_CHECK([for atomic builtins for long long],
glibcxx_cv_atomic_long_long, [
AC_TRY_LINK(
[ ],
[typedef long long atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
__atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
],
[glibcxx_cv_atomic_long_long=yes],
[glibcxx_cv_atomic_long_long=no])
])
else
# Do asm tests.
# Compile unoptimized.
CXXFLAGS='-O0 -S'
# Fake what AC_TRY_COMPILE does.
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
int main()
{
typedef bool atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
// N.B. __atomic_fetch_add is not supported for bool.
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
return 0;
}
EOF
AC_MSG_CHECKING([for atomic builtins for bool])
if AC_TRY_EVAL(ac_compile); then
if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
glibcxx_cv_atomic_bool=no
else
glibcxx_cv_atomic_bool=yes
fi
fi
AC_MSG_RESULT($glibcxx_cv_atomic_bool)
rm -f conftest*
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
int main()
{
typedef short atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
__atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
return 0;
}
EOF
AC_MSG_CHECKING([for atomic builtins for short])
if AC_TRY_EVAL(ac_compile); then
if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
glibcxx_cv_atomic_short=no
else
glibcxx_cv_atomic_short=yes
fi
fi
AC_MSG_RESULT($glibcxx_cv_atomic_short)
rm -f conftest*
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
int main()
{
// NB: _Atomic_word not necessarily int.
typedef int atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
__atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
return 0;
}
EOF
AC_MSG_CHECKING([for atomic builtins for int])
if AC_TRY_EVAL(ac_compile); then
if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
glibcxx_cv_atomic_int=no
else
glibcxx_cv_atomic_int=yes
fi
fi
AC_MSG_RESULT($glibcxx_cv_atomic_int)
rm -f conftest*
cat > conftest.$ac_ext << EOF
[#]line __oline__ "configure"
int main()
{
typedef long long atomic_type;
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
__atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
__atomic_load_n(&c1, __ATOMIC_RELAXED);
return 0;
}
EOF
AC_MSG_CHECKING([for atomic builtins for long long])
if AC_TRY_EVAL(ac_compile); then
if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
glibcxx_cv_atomic_long_long=no
else
glibcxx_cv_atomic_long_long=yes
fi
fi
AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
rm -f conftest*
fi
CXXFLAGS="$old_CXXFLAGS"
AC_LANG_RESTORE
# Set atomicity_dir to builtins if all but the long long test above passes,
# or if the builtins were already chosen (e.g. by configure.host).
if { test "$glibcxx_cv_atomic_bool" = yes \
&& test "$glibcxx_cv_atomic_short" = yes \
&& test "$glibcxx_cv_atomic_int" = yes; } \
|| test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
[Define if the compiler supports C++11 atomics.])
atomicity_dir=cpu/generic/atomicity_builtins
fi
# If still generic, set to mutex.
if test $atomicity_dir = "cpu/generic" ; then
atomicity_dir=cpu/generic/atomicity_mutex
AC_MSG_WARN([No native atomic operations are provided for this platform.])
if test "x$target_thread_file" = xsingle; then
AC_MSG_WARN([They cannot be faked when thread support is disabled.])
AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
else
AC_MSG_WARN([They will be faked using a mutex.])
AC_MSG_WARN([Performance of certain classes will degrade as a result.])
fi
fi
])
dnl
dnl Set default lock policy for synchronizing shared_ptr reference counting.
dnl
dnl --with-libstdcxx-lock-policy=auto
dnl Use atomic operations for shared_ptr reference counting only if
dnl the default target supports atomic compare-and-swap.
dnl --with-libstdcxx-lock-policy=atomic
dnl Use atomic operations for shared_ptr reference counting.
dnl --with-libstdcxx-lock-policy=mutex
dnl Use a mutex to synchronize shared_ptr reference counting.
dnl
dnl This controls the value of __gnu_cxx::__default_lock_policy, which
dnl determines how shared_ptr reference counts are synchronized.
dnl The option "atomic" means that atomic operations should be used,
dnl "mutex" means that a mutex will be used. The default option, "auto",
dnl will check if the target supports the compiler-generated builtins
dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
dnl and will use "atomic" if supported, "mutex" otherwise.
dnl This option is ignored if the thread model used by GCC is "single",
dnl as no synchronization is used at all in that case.
dnl This option affects the library ABI (except in the "single" thread model).
dnl
dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
dnl
AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
AC_ARG_WITH([libstdcxx-lock-policy],
AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
[synchronization policy for shared_ptr reference counting [default=auto]]),
[libstdcxx_atomic_lock_policy=$withval],
[libstdcxx_atomic_lock_policy=auto])
case "$libstdcxx_atomic_lock_policy" in
atomic|mutex|auto) ;;
*) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
esac
AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
AC_TRY_COMPILE([
#if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
# error "No 2-byte compare-and-swap"
#elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
# error "No 4-byte compare-and-swap"
#endif
],,
[libstdcxx_atomic_lock_policy=atomic],
[libstdcxx_atomic_lock_policy=mutex])
AC_LANG_RESTORE
CXXFLAGS="$ac_save_CXXFLAGS"
fi
if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
AC_MSG_RESULT(atomic)
AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
[Defined if shared_ptr reference counting should use atomic operations.])
else
AC_MSG_RESULT(mutex)
fi
])
dnl
dnl Allow visibility attributes to be used on namespaces, objects, etc.
dnl
dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
dnl Where DEFAULT is 'yes'.
dnl
AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
if test x$enable_libstdcxx_visibility = xyes ; then
dnl all hail libgfortran
dnl Check whether the target supports hidden visibility.
AC_CACHE_CHECK([whether the target supports hidden visibility],
glibcxx_cv_have_attribute_visibility, [
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror"
AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
[], glibcxx_cv_have_attribute_visibility=yes,
glibcxx_cv_have_attribute_visibility=no)
CFLAGS="$save_CFLAGS"])
if test $glibcxx_cv_have_attribute_visibility = no; then
enable_libstdcxx_visibility=no
fi
fi
GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
])
dnl
dnl Add version tags to symbols in shared library (or not), additionally
dnl marking other symbols as private/local (or not).
dnl
dnl Sets libtool_VERSION, and determines shared library SONAME.
dnl
dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
dnl
dnl --enable-symvers=style adds a version script to the linker call when
dnl creating the shared library. The choice of version script is
dnl controlled by 'style'.
dnl --disable-symvers does not.
dnl
dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
dnl choose a default style based on linker characteristics. Passing
dnl 'no' disables versioning.
dnl
AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
[enables symbol versioning of the shared library],
[permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
# If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
# don't know enough about $LD to do tricks...
AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
# Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
# with extern "C++" in version scripts.
AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
# Turn a 'yes' into a suitable default.
if test x$enable_symvers = xyes ; then
if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
enable_symvers=no
else
if test $with_gnu_ld = yes ; then
case ${target_os} in
hpux*)
enable_symvers=no ;;
*)
enable_symvers=gnu ;;
esac
else
case ${target_os} in
darwin*)
enable_symvers=darwin ;;
# Sun symbol versioning exists since Solaris 2.5.
solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
# make_sunver.pl needs GNU c++filt to support extern "C++" in
# version scripts, so disable symbol versioning if none can be
# found.
if test -z "$ac_cv_path_CXXFILT"; then
AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
AC_MSG_WARN([=== no GNU c++filt could be found.])
AC_MSG_WARN([=== Symbol versioning will be disabled.])
enable_symvers=no
else
enable_symvers=sun
fi
;;
*)
enable_symvers=no ;;
esac
fi
fi
fi
# Check to see if 'darwin' or 'darwin-export' can win.
if test x$enable_symvers = xdarwin-export ; then
enable_symvers=darwin
fi
# Check if 'sun' was requested on non-Solaris 2 platforms.
if test x$enable_symvers = xsun ; then
case ${target_os} in
solaris2*)
# All fine.
;;
*)
# Unlikely to work.
AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
AC_MSG_WARN([=== you are not targetting Solaris 2.])
AC_MSG_WARN([=== Symbol versioning will be disabled.])
enable_symvers=no
;;
esac
fi
# Check to see if 'gnu' can win.
if test $enable_symvers = gnu ||
test $enable_symvers = gnu-versioned-namespace ||
test $enable_symvers = sun; then
# Check to see if libgcc_s exists, indicating that shared libgcc is possible.
AC_MSG_CHECKING([for shared libgcc])
ac_save_CFLAGS="$CFLAGS"
CFLAGS=' -lgcc_s'
AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
CFLAGS="$ac_save_CFLAGS"
if test $glibcxx_shared_libgcc = no; then
cat > conftest.c <<EOF
int main (void) { return 0; }
EOF
changequote(,)dnl
glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
-shared -shared-libgcc -o conftest.so \
conftest.c -v 2>&1 >/dev/null \
| sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
changequote([,])dnl
rm -f conftest.c conftest.so
if test x${glibcxx_libgcc_s_suffix+set} = xset; then
CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
CFLAGS="$ac_save_CFLAGS"
fi
fi
AC_MSG_RESULT($glibcxx_shared_libgcc)
# For GNU ld, we need at least this version. The format is described in
# GLIBCXX_CHECK_LINKER_FEATURES above.
glibcxx_min_gnu_ld_version=21400
# If no shared libgcc, can't win.
if test $glibcxx_shared_libgcc != yes; then
AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
AC_MSG_WARN([=== you are not building a shared libgcc_s.])
AC_MSG_WARN([=== Symbol versioning will be disabled.])
enable_symvers=no
elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
: All interesting versions of Sun ld support sun style symbol versioning.
elif test $with_gnu_ld != yes ; then
# just fail for now
AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
AC_MSG_WARN([=== you are not using the GNU linker.])
AC_MSG_WARN([=== Symbol versioning will be disabled.])
enable_symvers=no
elif test $glibcxx_ld_is_gold = yes ; then
: All versions of gold support symbol versioning.
elif test $glibcxx_ld_is_mold = yes ; then
: All versions of mold support symbol versioning.
elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
# The right tools, the right setup, but too old. Fallbacks?
AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
AC_MSG_WARN(=== You would need to upgrade your binutils to version)
AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
AC_MSG_WARN([=== Symbol versioning will be disabled.])
enable_symvers=no
fi
fi
# For libtool versioning info, format is CURRENT:REVISION:AGE
libtool_VERSION=6:30:0
# Everything parsed; figure out what files and settings to use.
case $enable_symvers in
no)
SYMVER_FILE=config/abi/pre/none.ver
;;
gnu)
SYMVER_FILE=config/abi/pre/gnu.ver
AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
[Define to use GNU versioning in the shared library.])
;;
gnu-versioned-namespace)
libtool_VERSION=8:0:0
SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
[Define to use GNU namespace versioning in the shared library.])
;;
darwin)
SYMVER_FILE=config/abi/pre/gnu.ver
AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
[Define to use darwin versioning in the shared library.])
;;
sun)
SYMVER_FILE=config/abi/pre/gnu.ver
AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
[Define to use Sun versioning in the shared library.])
;;
esac
if test x$enable_symvers != xno ; then
AC_DEFINE(_GLIBCXX_SYMVER, 1,
[Define to use symbol versioning in the shared library.])
fi
AC_CACHE_CHECK([whether the target supports .symver directive],
glibcxx_cv_have_as_symver_directive, [
AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
[], glibcxx_cv_have_as_symver_directive=yes,
glibcxx_cv_have_as_symver_directive=no)])
if test $glibcxx_cv_have_as_symver_directive = yes; then
AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
[Define to 1 if the target assembler supports .symver directive.])
fi
AC_SUBST(SYMVER_FILE)
AC_SUBST(port_specific_symbol_files)
GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
if test $enable_symvers != no ; then
case ${target_os} in
# The Solaris 2 runtime linker doesn't support the GNU extension of
# binding the same symbol to different versions
solaris2*)
;;
# Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
*)
AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
[Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
;;
esac
fi
# Now, set up compatibility support, if any.
# In addition, need this to deal with std::size_t mangling in
# src/compatibility.cc. In a perfect world, could use
# typeid(std::size_t).name()[0] to do direct substitution.
AC_MSG_CHECKING([for size_t as unsigned int])
ac_save_CFLAGS="$CFLAGS"
CFLAGS="-Werror"
AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
[glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
CFLAGS=$ac_save_CFLAGS
if test "$glibcxx_size_t_is_i" = yes; then
AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
fi
AC_MSG_RESULT([$glibcxx_size_t_is_i])
AC_MSG_CHECKING([for ptrdiff_t as int])
ac_save_CFLAGS="$CFLAGS"
CFLAGS="-Werror"
AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
[glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
CFLAGS=$ac_save_CFLAGS
if test "$glibcxx_ptrdiff_t_is_i" = yes; then
AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
fi
AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
])
dnl
dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
dnl We must stage the required headers so that they will be installed
dnl with the library (unlike libgcc, the STL implementation is provided
dnl solely within headers). Since we must not inject random user-space
dnl macro names into user-provided C++ code, we first stage into <file>-in
dnl and process to <file> with an output command. The reason for a two-
dnl stage process here is to correctly handle $srcdir!=$objdir without
dnl having to write complex code (the sed commands to clean the macro
dnl namespace are complex and fragile enough as it is). We must also
dnl add a relative path so that -I- is supported properly.
dnl
dnl Substs:
dnl thread_header
dnl
AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
AC_MSG_CHECKING([for thread model used by GCC])
target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
AC_MSG_RESULT([$target_thread_file])
GCC_AC_THREAD_HEADER([$target_thread_file])
])
dnl
dnl Check if gthread implementation defines the types and functions
dnl required by the c++0x thread library. Conforming gthread
dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
dnl
dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
dnl
AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
if test x$enable_libstdcxx_threads = xauto ||
test x$enable_libstdcxx_threads = xyes; then
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions \
-I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
case $target_thread_file in
posix)
CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
esac
AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
AC_TRY_COMPILE([#include <unistd.h>],
[
// In case of POSIX threads check _POSIX_TIMEOUTS.
#if (defined(_PTHREADS) \
&& (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
#error
#endif
], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
[Define to 1 if mutex_timedlock is available.])
if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
else res_mutex_timedlock=no ; fi
AC_MSG_RESULT([$res_mutex_timedlock])
AC_MSG_CHECKING([for gthreads library])
AC_TRY_COMPILE([#include "gthr.h"],
[
#ifndef __GTHREADS_CXX0X
#error
#endif
], [ac_has_gthreads=yes], [ac_has_gthreads=no])
else
ac_has_gthreads=no
fi
AC_MSG_RESULT([$ac_has_gthreads])
if test x"$ac_has_gthreads" = x"yes"; then
AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
[Define if gthreads library is available.])
# Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
# but only do so if we're using pthread in the gthread library.
# On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
# but the pthread library is not there by default and the gthread library
# does not use it.
AC_TRY_COMPILE([#include "gthr.h"],
[
#if (!defined(_PTHREADS))
#error
#endif
], [ac_gthread_use_pthreads=yes], [ac_gthread_use_pthreads=no])
if test x"$ac_gthread_use_pthreads" = x"yes"; then
AC_CHECK_TYPE([pthread_rwlock_t],
[AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
[Define if POSIX read/write locks are available in <gthr.h>.])],
[],
[#include "gthr.h"])
fi
fi
AC_CHECK_HEADER(semaphore.h, [
AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
AC_TRY_COMPILE([
#include <unistd.h>
#include <semaphore.h>
#include <limits.h>
],
[
#if !defined _POSIX_TIMEOUTS || _POSIX_TIMEOUTS <= 0
# error "POSIX Timeouts option not supported"
#elif !defined _POSIX_SEMAPHORES || _POSIX_SEMAPHORES <= 0
# error "POSIX Semaphores option not supported"
#else
#if defined SEM_VALUE_MAX
constexpr int sem_value_max = SEM_VALUE_MAX;
#elif defined _POSIX_SEM_VALUE_MAX
constexpr int sem_value_max = _POSIX_SEM_VALUE_MAX;
#else
# error "SEM_VALUE_MAX not available"
#endif
sem_t sem;
sem_init(&sem, 0, sem_value_max);
struct timespec ts = { 0 };
sem_timedwait(&sem, &ts);
#endif
],
[ac_have_posix_semaphore=yes],
[ac_have_posix_semaphore=no])],
[ac_have_posix_semaphore=no])
if test $ac_have_posix_semaphore = yes ; then
AC_DEFINE(HAVE_POSIX_SEMAPHORE,
1,
[Define to 1 if POSIX Semaphores with sem_timedwait are available in <semaphore.h>.])
fi
AC_MSG_RESULT([$ac_have_posix_semaphore])
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
# Check whether LC_MESSAGES is available in <locale.h>.
# Ulrich Drepper <drepper@cygnus.com>, 1995.
#
# This file file be copied and used freely without restrictions. It can
# be used in projects which are not available under the GNU Public License
# but which still want to provide support for the GNU gettext functionality.
# Please note that the actual code is *not* freely available.
AC_DEFUN([AC_LC_MESSAGES], [
AC_CHECK_HEADER(locale.h, [
AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
[AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
if test $ac_cv_val_LC_MESSAGES = yes; then
AC_DEFINE(HAVE_LC_MESSAGES, 1,
[Define if LC_MESSAGES is available in <locale.h>.])
fi
])
])
dnl
dnl Check whether rdrand is supported in the assembler.
AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
AC_CACHE_CHECK([for rdrand support in assembler],
ac_cv_x86_rdrand, [
ac_cv_x86_rdrand=no
case "$target" in
i?86-*-* | \
x86_64-*-*)
AC_TRY_COMPILE(, [asm("rdrand %eax");],
[ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
esac
])
if test $ac_cv_x86_rdrand = yes; then
AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
[ Defined if as can handle rdrand. ])
fi
])
dnl
dnl Check whether rdseed is supported in the assembler.
AC_DEFUN([GLIBCXX_CHECK_X86_RDSEED], [
AC_CACHE_CHECK([for rdseed support in assembler],
ac_cv_x86_rdseed, [
ac_cv_x86_rdseed=no
case "$target" in
i?86-*-* | \
x86_64-*-*)
AC_TRY_COMPILE(, [asm("rdseed %eax");],
[ac_cv_x86_rdseed=yes], [ac_cv_x86_rdseed=no])
esac
])
if test $ac_cv_x86_rdseed = yes; then
AC_DEFINE(_GLIBCXX_X86_RDSEED, 1,
[ Defined if as can handle rdseed. ])
fi
])
dnl
dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
dnl
AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CACHE_CHECK([for get_nprocs],
glibcxx_cv_GET_NPROCS, [
GCC_TRY_COMPILE_OR_LINK(
[#include <sys/sysinfo.h>],
[int n = get_nprocs();],
[glibcxx_cv_GET_NPROCS=yes],
[glibcxx_cv_GET_NPROCS=no])
])
if test $glibcxx_cv_GET_NPROCS = yes; then
AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
dnl
AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CACHE_CHECK([for _SC_NPROCESSORS_ONLN],
glibcxx_cv_SC_NPROCESSORS_ONLN, [
GCC_TRY_COMPILE_OR_LINK(
[#include <unistd.h>],
[int n = sysconf(_SC_NPROCESSORS_ONLN);],
[glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
[glibcxx_cv_SC_NPROCESSORS_ONLN=no])
])
if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
dnl
AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CACHE_CHECK([for _SC_NPROC_ONLN],
glibcxx_cv_SC_NPROC_ONLN, [
GCC_TRY_COMPILE_OR_LINK(
[#include <unistd.h>],
[int n = sysconf(_SC_NPROC_ONLN);],
[glibcxx_cv_SC_NPROC_ONLN=yes],
[glibcxx_cv_SC_NPROC_ONLN=no])
])
if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
dnl
AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CACHE_CHECK([for pthreads_num_processors_np],
glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
GCC_TRY_COMPILE_OR_LINK(
[#include <pthread.h>],
[int n = pthread_num_processors_np();],
[glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
[glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
])
if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check whether pthread_cond_clockwait is available in <pthread.h> for std::condition_variable to use,
dnl and define _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT.
dnl
AC_DEFUN([GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
ac_save_LIBS="$LIBS"
LIBS="$LIBS -lpthread"
AC_CACHE_CHECK([for pthread_cond_clockwait],
glibcxx_cv_PTHREAD_COND_CLOCKWAIT, [
GCC_TRY_COMPILE_OR_LINK(
[#include <pthread.h>],
[pthread_mutex_t mutex; pthread_cond_t cond; struct timespec ts; int n = pthread_cond_clockwait(&cond, &mutex, 0, &ts);],
[glibcxx_cv_PTHREAD_COND_CLOCKWAIT=yes],
[glibcxx_cv_PTHREAD_COND_CLOCKWAIT=no])
])
if test $glibcxx_cv_PTHREAD_COND_CLOCKWAIT = yes; then
AC_DEFINE(_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT, 1, [Define if pthread_cond_clockwait is available in <pthread.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
AC_LANG_RESTORE
])
dnl
dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
dnl
AC_DEFUN([GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
ac_save_LIBS="$LIBS"
LIBS="$LIBS -lpthread"
AC_CACHE_CHECK([for pthread_mutex_clocklock],
glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK, [
GCC_TRY_COMPILE_OR_LINK(
[#include <pthread.h>],
[pthread_mutex_t mutex; struct timespec ts; int n = pthread_mutex_clocklock(&mutex, CLOCK_REALTIME, &ts);],
[glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=yes],
[glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=no])
])
if test $glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK = yes; then
AC_DEFINE(_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK, 1, [Define if pthread_mutex_clocklock is available in <pthread.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
AC_LANG_RESTORE
])
dnl
dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
dnl
AC_DEFUN([GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
ac_save_LIBS="$LIBS"
LIBS="$LIBS -lpthread"
AC_CACHE_CHECK([for pthread_rwlock_clockrdlock, pthread_wlock_clockwrlock],
glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK, [
GCC_TRY_COMPILE_OR_LINK(
[#include <pthread.h>],
[pthread_rwlock_t rwl; struct timespec ts;]
[int n = pthread_rwlock_clockrdlock(&rwl, CLOCK_REALTIME, &ts);]
[int m = pthread_rwlock_clockwrlock(&rwl, CLOCK_REALTIME, &ts);],
[glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=yes],
[glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=no])
])
if test $glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK = yes; then
AC_DEFINE(_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK, 1, [Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are available in <pthread.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
AC_LANG_RESTORE
])
dnl
dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
dnl
AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
AC_CACHE_CHECK([for hw.ncpu sysctl],
glibcxx_cv_SYSCTL_HW_NCPU, [
GCC_TRY_COMPILE_OR_LINK(
[
#include <stddef.h>
#include <sys/sysctl.h>
],
[
int count;
size_t size = sizeof(count);
int mib[] = { CTL_HW, HW_NCPU };
sysctl(mib, 2, &count, &size, NULL, 0);
],
[glibcxx_cv_SYSCTL_HW_NCPU=yes],
[glibcxx_cv_SYSCTL_HW_NCPU=no])
])
if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
fi
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check to see if python pretty printing can be activated.
dnl
dnl --with-python-dir=dir
dnl installs directory into $prefix/dir
AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
AC_MSG_CHECKING([for custom python install directory])
AC_ARG_WITH([python-dir],
AS_HELP_STRING([--with-python-dir],
[the location to install Python modules. This path is relative starting from the prefix.]),
[with_python_dir=$withval], [with_python_dir="no"])
AC_MSG_RESULT(${with_python_dir})
# Needed for installing Python modules during make install.
python_mod_dir="${with_python_dir}"
AC_SUBST(python_mod_dir)
GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
])
dnl
dnl Check to see if -Werror is disabled.
dnl
dnl --enable-werror/--disable-werror
AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
AC_MSG_CHECKING([for -Werror])
GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
AC_MSG_RESULT($enable_werror)
GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
])
dnl
dnl Check whether obsolescent tmpnam is available in <stdio.h>,
dnl and define _GLIBCXX_USE_TMPNAM.
dnl
AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
dnl
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
dnl
AC_CACHE_CHECK([for tmpnam], glibcxx_cv_TMPNAM, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <stdio.h>],
[char *tmp = tmpnam(NULL);],
[glibcxx_cv_TMPNAM=yes],
[glibcxx_cv_TMPNAM=no])
])
if test $glibcxx_cv_TMPNAM = yes; then
AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
fi
dnl
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check to see if sys/sdt.h exists and that it is suitable for use.
dnl Some versions of sdt.h were not compatible with C++11.
dnl
AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
# Note that this test has to be run with the C language.
# Otherwise, sdt.h will try to include some headers from
# libstdc++ itself.
AC_LANG_SAVE
AC_LANG_C
AC_CACHE_CHECK([for suitable sys/sdt.h],
glibcxx_cv_sys_sdt_h, [
# Because we have to run the test in C, we use grep rather
# than the compiler to check for the bug. The bug is that
# were strings without trailing whitespace, causing g++
# to look for operator"". The pattern searches for the fixed
# output.
AC_EGREP_CPP([ \",\" ], [
#include <sys/sdt.h>
int f() { STAP_PROBE(hi, bob); }
], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
])
AC_LANG_RESTORE
if test $glibcxx_cv_sys_sdt_h = yes; then
AC_DEFINE(HAVE_SYS_SDT_H, 1,
[Define to 1 if you have a suitable <sys/sdt.h> header file])
fi
])
dnl
dnl Control whether the library should define symbols for old and new ABIs.
dnl This affects definitions of strings, stringstreams and locale facets.
dnl
dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
dnl
dnl Defines:
dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
dnl
AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
if test x$enable_symvers = xgnu-versioned-namespace; then
# gnu-versioned-namespace is incompatible with the dual ABI.
enable_libstdcxx_dual_abi="no"
fi
if test x"$enable_libstdcxx_dual_abi" != xyes; then
AC_MSG_NOTICE([dual ABI is disabled])
default_libstdcxx_abi="gcc4-compatible"
fi
GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
])
dnl
dnl Check to see which ABI should be enabled by default.
dnl
dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
dnl
dnl Defines:
dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
dnl
AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
if test x$enable_libstdcxx_dual_abi = xyes; then
AC_MSG_CHECKING([for default std::string ABI to use])
AC_ARG_WITH([default-libstdcxx-abi],
AS_HELP_STRING([--with-default-libstdcxx-abi],
[set the std::string ABI to use by default]),
[case "$withval" in
gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
new|cxx11) default_libstdcxx_abi="new" ;;
c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
*) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
esac
],
[default_libstdcxx_abi="new"])
AC_MSG_RESULT(${default_libstdcxx_abi})
fi
if test $default_libstdcxx_abi = "new"; then
glibcxx_cxx11_abi=1
glibcxx_cxx98_abi=0
else
glibcxx_cxx11_abi=0
glibcxx_cxx98_abi=1
fi
AC_SUBST(glibcxx_cxx98_abi)
GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
])
dnl
dnl Check to see whether to build libstdc++fs.a
dnl
dnl --enable-libstdcxx-filesystem-ts
dnl
AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
[turns on ISO/IEC TS 18822 support],
[permit yes|no|auto])
AC_MSG_CHECKING([whether to build Filesystem TS support])
if test x"$ac_cv_header_dirent_h" != x"yes"; then
enable_libstdcxx_filesystem_ts=no
fi
if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
case "${target_os}" in
freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
enable_libstdcxx_filesystem_ts=yes
;;
gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
enable_libstdcxx_filesystem_ts=yes
;;
rtems*)
enable_libstdcxx_filesystem_ts=yes
;;
solaris*)
enable_libstdcxx_filesystem_ts=yes
;;
mingw*)
enable_libstdcxx_filesystem_ts=yes
;;
*)
enable_libstdcxx_filesystem_ts=no
;;
esac
fi
AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
])
dnl
dnl Check whether the library calls required by the C++17 Filesystem library
dnl and the Filesystem TS are present.
dnl Defines:
dnl HAVE_STRUCT_DIRENT_D_TYPE
dnl _GLIBCXX_USE_REALPATH
dnl _GLIBCXX_USE_UTIMENSAT
dnl _GLIBCXX_USE_ST_MTIM
dnl _GLIBCXX_USE_FCHMOD
dnl _GLIBCXX_USE_FCHMODAT
dnl _GLIBCXX_USE_SENDFILE
dnl HAVE_LINK
dnl HAVE_READLINK
dnl HAVE_SYMLINK
dnl
AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
dnl
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fno-exceptions"
dnl
AC_CACHE_CHECK([for struct dirent.d_type], glibcxx_cv_dirent_d_type, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <dirent.h>],
[
struct dirent d;
if (sizeof d.d_type) return 0;
],
[glibcxx_cv_dirent_d_type=yes],
[glibcxx_cv_dirent_d_type=no])
])
if test $glibcxx_cv_dirent_d_type = yes; then
AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
fi
dnl
AC_CACHE_CHECK([for realpath], glibcxx_cv_realpath, [dnl
GCC_TRY_COMPILE_OR_LINK(
[
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
],
[
#if _XOPEN_VERSION < 500
#error
#elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
char *tmp = realpath((const char*)NULL, (char*)NULL);
#else
#error
#endif
],
[glibcxx_cv_realpath=yes],
[glibcxx_cv_realpath=no])
])
if test $glibcxx_cv_realpath = yes; then
AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
fi
dnl
AC_CACHE_CHECK([for utimensat], glibcxx_cv_utimensat, [dnl
GCC_TRY_COMPILE_OR_LINK(
[
#include <fcntl.h>
#include <sys/stat.h>
],
[
struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
int i = utimensat(AT_FDCWD, "path", ts, 0);
],
[glibcxx_cv_utimensat=yes],
[glibcxx_cv_utimensat=no])
])
if test $glibcxx_cv_utimensat = yes; then
AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
fi
dnl
AC_CACHE_CHECK([for utime], glibcxx_cv_utime, [dnl
GCC_TRY_COMPILE_OR_LINK(
[
#include <utime.h>
],
[
struct utimbuf t = { 1, 1 };
int i = utime("path", &t);
],
[glibcxx_cv_utime=yes],
[glibcxx_cv_utime=no])
])
if test $glibcxx_cv_utime = yes; then
AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
fi
dnl
AC_CACHE_CHECK([for lstat], glibcxx_cv_lstat, [dnl
GCC_TRY_COMPILE_OR_LINK(
[ #include <sys/stat.h> ],
[
struct stat st;
int i = lstat("path", &st);
],
[glibcxx_cv_lstat=yes],
[glibcxx_cv_lstat=no])
])
if test $glibcxx_cv_lstat = yes; then
AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
fi
dnl
AC_CACHE_CHECK([for struct stat.st_mtim.tv_nsec],
glibcxx_cv_st_mtim, [dnl
GCC_TRY_COMPILE_OR_LINK(
[ #include <sys/stat.h> ],
[
struct stat st;
return st.st_mtim.tv_nsec;
],
[glibcxx_cv_st_mtim=yes],
[glibcxx_cv_st_mtim=no])
])
if test $glibcxx_cv_st_mtim = yes; then
AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
fi
dnl
AC_CACHE_CHECK([for fchmod],
glibcxx_cv_fchmod, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <sys/stat.h>],
[fchmod(1, S_IWUSR);],
[glibcxx_cv_fchmod=yes],
[glibcxx_cv_fchmod=no])
])
if test $glibcxx_cv_fchmod = yes; then
AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
fi
dnl
AC_CACHE_CHECK([for fchmodat],
glibcxx_cv_fchmodat, [dnl
GCC_TRY_COMPILE_OR_LINK(
[
#include <fcntl.h>
#include <sys/stat.h>
],
[fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
[glibcxx_cv_fchmodat=yes],
[glibcxx_cv_fchmodat=no])
])
if test $glibcxx_cv_fchmodat = yes; then
AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
fi
dnl
AC_CACHE_CHECK([for sendfile that can copy files],
glibcxx_cv_sendfile, [dnl
case "${target_os}" in
gnu* | linux* | solaris* | uclinux*)
GCC_TRY_COMPILE_OR_LINK(
[#include <sys/sendfile.h>],
[sendfile(1, 2, (off_t*)0, sizeof 1);],
[glibcxx_cv_sendfile=yes],
[glibcxx_cv_sendfile=no])
;;
*)
glibcxx_cv_sendfile=no
;;
esac
])
if test $glibcxx_cv_sendfile = yes; then
AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
fi
dnl
AC_CACHE_CHECK([for link],
glibcxx_cv_link, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <unistd.h>],
[link("", "");],
[glibcxx_cv_link=yes],
[glibcxx_cv_link=no])
])
if test $glibcxx_cv_link = yes; then
AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
fi
dnl
AC_CACHE_CHECK([for readlink],
glibcxx_cv_readlink, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <unistd.h>],
[char buf[32]; readlink("", buf, sizeof(buf));],
[glibcxx_cv_readlink=yes],
[glibcxx_cv_readlink=no])
])
if test $glibcxx_cv_readlink = yes; then
AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
fi
dnl
AC_CACHE_CHECK([for symlink],
glibcxx_cv_symlink, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <unistd.h>],
[symlink("", "");],
[glibcxx_cv_symlink=yes],
[glibcxx_cv_symlink=no])
])
if test $glibcxx_cv_symlink = yes; then
AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
fi
dnl
AC_CACHE_CHECK([for truncate],
glibcxx_cv_truncate, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <unistd.h>],
[truncate("", 99);],
[glibcxx_cv_truncate=yes],
[glibcxx_cv_truncate=no])
])
if test $glibcxx_cv_truncate = yes; then
AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
fi
dnl
AC_CACHE_CHECK([for fdopendir],
glibcxx_cv_fdopendir, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <dirent.h>],
[::DIR* dir = ::fdopendir(1);],
[glibcxx_cv_fdopendir=yes],
[glibcxx_cv_fdopendir=no])
])
if test $glibcxx_cv_fdopendir = yes; then
AC_DEFINE(HAVE_FDOPENDIR, 1, [Define if fdopendir is available in <dirent.h>.])
fi
dnl
AC_CACHE_CHECK([for dirfd],
glibcxx_cv_dirfd, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <dirent.h>],
[int fd = ::dirfd((::DIR*)0);],
[glibcxx_cv_dirfd=yes],
[glibcxx_cv_dirfd=no])
])
if test $glibcxx_cv_dirfd = yes; then
AC_DEFINE(HAVE_DIRFD, 1, [Define if dirfd is available in <dirent.h>.])
fi
dnl
AC_CACHE_CHECK([for unlinkat],
glibcxx_cv_unlinkat, [dnl
GCC_TRY_COMPILE_OR_LINK(
[#include <fcntl.h>
#include <unistd.h>],
[::unlinkat(AT_FDCWD, "", AT_REMOVEDIR);],
[glibcxx_cv_unlinkat=yes],
[glibcxx_cv_unlinkat=no])
])
if test $glibcxx_cv_unlinkat = yes; then
AC_DEFINE(HAVE_UNLINKAT, 1, [Define if unlinkat is available in <fcntl.h>.])
fi
dnl
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
dnl
dnl Check how size_t is mangled. Copied from libitm.
dnl
AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
AC_CACHE_CHECK([how size_t is mangled],
glibcxx_cv_size_t_mangling, [
AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
[glibcxx_cv_size_t_mangling=m], [
AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
[glibcxx_cv_size_t_mangling=j], [
AC_TRY_COMPILE([],
[extern __SIZE_TYPE__ x; extern unsigned long long x;],
[glibcxx_cv_size_t_mangling=y], [
AC_TRY_COMPILE([],
[extern __SIZE_TYPE__ x; extern unsigned short x;],
[glibcxx_cv_size_t_mangling=t], [
AC_TRY_COMPILE([],
[extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
[glibcxx_cv_size_t_mangling=u6uint20],
[glibcxx_cv_size_t_mangling=x])
])
])
])
])
])
if test $glibcxx_cv_size_t_mangling = x; then
AC_MSG_ERROR([Unknown underlying type for size_t])
fi
AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
[Define to the letter to which size_t is mangled.])
])
dnl
dnl Determine whether std::exception_ptr symbols should be exported with
dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
dnl release first added support for std::exception_ptr. Originally it was
dnl only supported for targets with always-lock-free atomics for int, but
dnl since GCC 7.1 it is supported for all targets.
dnl
AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
if test $enable_symvers != no; then
AC_MSG_CHECKING([for first version to support std::exception_ptr])
case ${target} in
aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
ac_exception_ptr_since_gcc46=yes
;;
*)
# If the value of this macro changes then we will need to hardcode
# yes/no here for additional targets based on the original value.
AC_TRY_COMPILE([], [
#if __GCC_ATOMIC_INT_LOCK_FREE <= 1
# error atomic int not always lock free
#endif
],
[ac_exception_ptr_since_gcc46=yes],
[ac_exception_ptr_since_gcc46=no])
;;
esac
if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
[Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
AC_MSG_RESULT([4.6.0])
else
AC_MSG_RESULT([7.1.0])
fi
fi
])
dnl
dnl Check whether getentropy is present in <unistd.h>.
dnl
AC_DEFUN([GLIBCXX_CHECK_GETENTROPY], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_CACHE_CHECK([for getentropy], glibcxx_cv_getentropy, [
GCC_TRY_COMPILE_OR_LINK(
[#include <unistd.h>],
[unsigned i;
::getentropy(&i, sizeof(i));],
[glibcxx_cv_getentropy=yes], [glibcxx_cv_getentropy=no])
])
if test $glibcxx_cv_getentropy = yes; then
AC_DEFINE(HAVE_GETENTROPY, 1, [Define if getentropy is available in <unistd.h>.])
fi
AC_LANG_RESTORE
])
dnl
dnl Check whether arc4random is present in <stdlib.h>.
dnl
AC_DEFUN([GLIBCXX_CHECK_ARC4RANDOM], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_CACHE_CHECK([for arc4random], glibcxx_cv_arc4random, [
GCC_TRY_COMPILE_OR_LINK(
[#include <stdlib.h>],
[unsigned i = ::arc4random();],
[glibcxx_cv_arc4random=yes], [glibcxx_cv_arc4random=no])
])
if test $glibcxx_cv_arc4random = yes; then
AC_DEFINE(HAVE_ARC4RANDOM, 1, [Define if arc4random is available in <stdlib.h>.])
fi
AC_LANG_RESTORE
])
dnl
dnl Check to see whether to build libstdc++_libbacktrace.a
dnl
dnl --enable-libstdcxx-backtrace
dnl
AC_DEFUN([GLIBCXX_ENABLE_BACKTRACE], [
GLIBCXX_ENABLE(libstdcxx-backtrace,auto,,
[turns on libbacktrace support],
[permit yes|no|auto])
# Most of this is adapted from libsanitizer/configure.ac
BACKTRACE_CPPFLAGS=
# libbacktrace only needs atomics for int, which we've already tested
if test "$glibcxx_cv_atomic_int" = "yes"; then
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_ATOMIC_FUNCTIONS=1"
fi
# Test for __sync support.
AC_CACHE_CHECK([__sync extensions],
[glibcxx_cv_sys_sync],
[GCC_TRY_COMPILE_OR_LINK(
[int i;],
[__sync_bool_compare_and_swap (&i, i, i);
__sync_lock_test_and_set (&i, 1);
__sync_lock_release (&i);],
[glibcxx_cv_sys_sync=yes],
[glibcxx_cv_sys_sync=no])
])
if test "$glibcxx_cv_sys_sync" = "yes"; then
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_SYNC_FUNCTIONS=1"
fi
# Check for dl_iterate_phdr.
AC_CHECK_HEADERS(link.h)
if test "$ac_cv_header_link_h" = "no"; then
have_dl_iterate_phdr=no
else
# When built as a GCC target library, we can't do a link test.
AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
[have_dl_iterate_phdr=no])
fi
if test "$have_dl_iterate_phdr" = "yes"; then
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_DL_ITERATE_PHDR=1"
fi
# Check for the fcntl function.
if test -n "${with_target_subdir}"; then
case "${host}" in
*-*-mingw*) have_fcntl=no ;;
*) have_fcntl=yes ;;
esac
else
AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
fi
if test "$have_fcntl" = "yes"; then
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_FCNTL=1"
fi
AC_CHECK_DECLS(strnlen)
# Check for getexecname function.
if test -n "${with_target_subdir}"; then
case "${host}" in
*-*-solaris2*) have_getexecname=yes ;;
*) have_getexecname=no ;;
esac
else
AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
fi
if test "$have_getexecname" = "yes"; then
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_GETEXECNAME=1"
fi
# The library needs to be able to read the executable itself. Compile
# a file to determine the executable format. The awk script
# filetype.awk prints out the file type.
AC_CACHE_CHECK([output filetype],
[glibcxx_cv_sys_filetype],
[filetype=
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([int i;], [int j;])],
[filetype=`${AWK} -f $srcdir/../libbacktrace/filetype.awk conftest.$ac_objext`],
[AC_MSG_FAILURE([compiler failed])])
glibcxx_cv_sys_filetype=$filetype])
# Match the file type to decide what files to compile.
FORMAT_FILE=
case "$glibcxx_cv_sys_filetype" in
elf*) FORMAT_FILE="elf.lo" ;;
*) AC_MSG_WARN([could not determine output file type])
FORMAT_FILE="unknown.lo"
enable_libstdcxx_backtrace=no
;;
esac
AC_SUBST(FORMAT_FILE)
# ELF defines.
elfsize=
case "$glibcxx_cv_sys_filetype" in
elf32) elfsize=32 ;;
elf64) elfsize=64 ;;
esac
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
ALLOC_FILE=alloc.lo
AC_SUBST(ALLOC_FILE)
VIEW_FILE=read.lo
AC_SUBST(VIEW_FILE)
AC_MSG_CHECKING([whether to build libbacktrace support])
if test "$enable_libstdcxx_backtrace" == "auto"; then
enable_libstdcxx_backtrace=no
fi
if test "$enable_libstdcxx_backtrace" == "yes"; then
BACKTRACE_SUPPORTED=1
BACKTRACE_USES_MALLOC=1
if test "$ac_has_gthreads" = "yes"; then
BACKTRACE_SUPPORTS_THREADS=1
else
BACKTRACE_SUPPORTS_THREADS=0
fi
AC_SUBST(BACKTRACE_CPPFLAGS)
AC_SUBST(BACKTRACE_SUPPORTED)
AC_SUBST(BACKTRACE_USES_MALLOC)
AC_SUBST(BACKTRACE_SUPPORTS_THREADS)
AC_DEFINE(HAVE_STACKTRACE, 1, [Define if the <stacktrace> header is supported.])
else
BACKTRACE_SUPPORTED=0
BACKTRACE_USES_MALLOC=0
BACKTRACE_SUPPORTS_THREADS=0
fi
AC_MSG_RESULT($enable_libstdcxx_backtrace)
GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" != no])
])
# Macros from the top-level gcc directory.
m4_include([../config/gc++filt.m4])
m4_include([../config/tls.m4])
m4_include([../config/gthr.m4])
m4_include([../config/cet.m4])
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