binutils-gdb/gdbserver/configure.ac
Simon Marchi da48217f31 gdbserver/linux: probe for libiconv in configure
Make gdbserver's build system locate libiconv when building for Linux.

Commit 07b3255c3b ("Filter invalid encodings from Linux thread names")
make libiconv madantory for building gdbserver on Linux.

While trying to cross-compile gdb for xtensa-fsf-linux-uclibc (with a
toolchain generated with crosstool-ng), I got:

    /home/smarchi/src/binutils-gdb/gdbserver/linux-low.cc:48:10: fatal error: iconv.h: No such file or directory
       48 | #include <iconv.h>
          |          ^~~~~~~~~

I downloaded GNU libiconv, built it for that host, and installed it in
an arbitrary directory.  I had to modify the gdbserver build system to
locate libiconv and use it, the result is this patch.

I eventually found that crosstool-ng has a config option to make uclibc
provide an implementation of iconv, which is of course much easier.  But
given that this patch is now written, I think it would be worth merging
it, it could help some people who do not have iconv built-in their libc
in the future (and may not have the luxury of rebuilding their libc like
I do).

Using AM_ICONV in configure.ac adds these options for configure (the
same we have for gdb):

    --with-libiconv-prefix[=DIR]  search for libiconv in DIR/include and DIR/lib
    --without-libiconv-prefix     don't search for libiconv in includedir and libdir
    --with-libiconv-type=TYPE     type of library to search for (auto/static/shared)

It sets the `LIBICONV` variable with whatever is needed to link with
libiconv, and adds the necessary `-I` flag to `CPPFLAGS`.

To avoid unnecessarily linking against libiconv on hosts that don't need
it, set `MAYBE_LIBICONV` with the contents of `LIBICONV` only if the
host is Linux, and use `MAYBE_LIBICONV` in `Makefile.in`.

Since libiconv is a hard requirement for Linux hosts, error out if it is
not found.

The bits in acinclude.m4 are similar to what we have in
gdb/acinclude.m4.

Update the top-level build system to support building against an in-tree
libiconv (I did not test this part though).  Something tells me that the
all-gdbserver dependency on all-libiconv is unnecessary, since there is
already a dependency of configure-gdbserver on all-libiconv (and
all-gdbserver surely depends on configure-gdbserver).  I just copied
what's done for GDB though.

ChangeLog:

	* Makefile.def: Add configure-gdbserver and all-gdbserver
	dependencies on all-libiconv.
	* Makefile.in: Re-generate.

Change-Id: I90f8ef88dd4917df5a68b45550d93622fc9cfed4
Approved-By: Tom Tromey <tom@tromey.com>
2024-03-14 13:40:08 -04:00

478 lines
13 KiB
Plaintext

dnl Autoconf configure script for GDB server.
dnl Copyright (C) 2000-2024 Free Software Foundation, Inc.
dnl
dnl This file is part of GDB.
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 3 of the License, or
dnl (at your option) any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program. If not, see <http://www.gnu.org/licenses/>.
dnl Process this file with autoconf to produce a configure script.
AC_INIT
AC_CONFIG_MACRO_DIRS([../config])
AC_CONFIG_SRCDIR([server.cc])
AC_CONFIG_HEADERS(config.h:config.in, [echo > stamp-h])
AM_MAINTAINER_MODE
AC_PROG_CC
AC_PROG_CXX
AC_USE_SYSTEM_EXTENSIONS
AC_SYS_LARGEFILE
AM_PROG_INSTALL_STRIP
# Set build, build_cpu, build_vendor and build_os.
AC_CANONICAL_BUILD
# Set host, host_cpu, host_vendor, and host_os.
AC_CANONICAL_HOST
# Set target, target_cpu, target_vendor, and target_os.
AC_CANONICAL_TARGET
AC_PROG_INSTALL
AC_CHECK_TOOL(AR, ar)
AC_PROG_RANLIB
AC_ARG_PROGRAM
# We require a C++17 compiler. Check if one is available, and if
# necessary, set CXX_DIALECT to some -std=xxx switch.
AX_CXX_COMPILE_STDCXX(17, , mandatory)
AC_HEADER_STDC
GDB_AC_COMMON
# This is set by GDB_AC_COMMON.
AC_SUBST(WIN32APILIBS)
GDB_AC_SELFTEST
ACX_NONCANONICAL_TARGET
ACX_NONCANONICAL_HOST
# Dependency checking.
ZW_CREATE_DEPDIR
dnl Set up for gettext.
ZW_GNU_GETTEXT_SISTER_DIR
# Create sub-directories for objects and dependencies.
CONFIG_SRC_SUBDIR="arch gdbsupport nat target"
AC_SUBST(CONFIG_SRC_SUBDIR)
AC_CONFIG_COMMANDS([gdbdepdir],[
for subdir in ${CONFIG_SRC_SUBDIR}
do
$SHELL $ac_aux_dir/mkinstalldirs $subdir/$DEPDIR
done],
[ac_aux_dir=$ac_aux_dir DEPDIR=$DEPDIR CONFIG_SRC_SUBDIR="$CONFIG_SRC_SUBDIR"])
ZW_PROG_COMPILER_DEPENDENCIES([CC])
AC_CHECK_HEADERS(termios.h sys/reg.h string.h dnl
sys/procfs.h linux/elf.h dnl
fcntl.h signal.h sys/file.h dnl
sys/ioctl.h netinet/in.h sys/socket.h netdb.h dnl
netinet/tcp.h arpa/inet.h ws2tcpip.h)
AC_FUNC_FORK
AC_CHECK_FUNCS(pread pwrite pread64)
# Check the return and argument types of ptrace.
GDB_AC_PTRACE
# Check for UST
ustlibs=""
ustinc=""
AC_ARG_WITH(ust, [ --with-ust=PATH Specify prefix directory for the installed UST package
Equivalent to --with-ust-include=PATH/include
plus --with-ust-lib=PATH/lib])
AC_ARG_WITH(ust_include, [ --with-ust-include=PATH Specify directory for installed UST include files])
AC_ARG_WITH(ust_lib, [ --with-ust-lib=PATH Specify the directory for the installed UST library])
case $with_ust in
no)
ustlibs=
ustinc=
;;
"" | yes)
ustlibs=" -lust "
ustinc=""
;;
*)
ustlibs="-L$with_ust/lib -lust"
ustinc="-I$with_ust/include "
;;
esac
if test "x$with_ust_include" != x; then
ustinc="-I$with_ust_include "
fi
if test "x$with_ust_lib" != x; then
ustlibs="-L$with_ust_lib -lust"
fi
if test "x$with_ust" != "xno"; then
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $ustinc"
AC_MSG_CHECKING([for ust])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[
#define CONFIG_UST_GDB_INTEGRATION
#include <ust/ust.h>
],
[]
)],
[AC_MSG_RESULT([yes]);
AC_DEFINE(HAVE_UST, 1, [Define if UST is available])],
[AC_MSG_RESULT([no])
ustlibs= ; ustinc= ]
)
CFLAGS="$saved_CFLAGS"
fi
# Flags needed for UST
AC_SUBST(ustlibs)
AC_SUBST(ustinc)
AM_GDB_COMPILER_TYPE
AM_GDB_WARNINGS
dnl dladdr is glibc-specific. It is used by thread-db.c but only for
dnl debugging messages. It lives in -ldl which is handled below so we don't
dnl use AC_CHECK_LIB (or AC_SEARCH_LIBS) here. Instead we just temporarily
dnl augment LIBS.
old_LIBS="$LIBS"
LIBS="$LIBS -ldl"
AC_CHECK_FUNCS(dladdr)
LIBS="$old_LIBS"
libiberty_INIT
AC_CHECK_DECLS([perror, vasprintf, vsnprintf])
AC_CHECK_TYPES(socklen_t, [], [],
[#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#elif HAVE_WS2TCPIP_H
# include <ws2tcpip.h>
#endif
])
case "${target}" in
*-android*)
# Starting with NDK version 9, <elf.h> actually includes definitions
# of Elf32_auxv_t and Elf64_auxv_t. But sadly, <elf.h> includes
# <sys/exec_elf.h> which defines some of the ELF types incorrectly,
# leading to conflicts with the defintions from <linux/elf.h>.
# This makes it impossible for us to include both <elf.h> and
# <linux/elf.h>, which means that, in practice, we do not have
# access to Elf32_auxv_t and Elf64_auxv_t on this platform.
# Therefore, do not try to auto-detect availability, as it would
# get it wrong on this platform.
;;
*)
AC_CHECK_TYPES([Elf32_auxv_t, Elf64_auxv_t], [], [],
#include <elf.h>
)
esac
ACX_PKGVERSION([GDB])
ACX_BUGURL([http://www.gnu.org/software/gdb/bugs/])
AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"], [Additional package description])
AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"], [Bug reporting address])
# Check for various supplementary target information (beyond the
# triplet) which might affect the choices in configure.srv.
case "${target}" in
changequote(,)dnl
i[34567]86-*-linux*)
changequote([,])dnl
AC_CACHE_CHECK([if building for x86-64], [gdb_cv_i386_is_x86_64],
[save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $CFLAGS"
AC_EGREP_CPP([got it], [
#if __x86_64__
got it
#endif
], [gdb_cv_i386_is_x86_64=yes],
[gdb_cv_i386_is_x86_64=no])
CPPFLAGS="$save_CPPFLAGS"])
;;
x86_64-*-linux*)
AC_CACHE_CHECK([if building for x32], [gdb_cv_x86_is_x32],
[save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $CFLAGS"
AC_EGREP_CPP([got it], [
#if __x86_64__ && __ILP32__
got it
#endif
], [gdb_cv_x86_is_x32=yes],
[gdb_cv_x86_is_x32=no])
CPPFLAGS="$save_CPPFLAGS"])
;;
m68k-*-*)
AC_CACHE_CHECK([if building for Coldfire], [gdb_cv_m68k_is_coldfire],
[save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $CFLAGS"
AC_EGREP_CPP([got it], [
#ifdef __mcoldfire__
got it
#endif
], [gdb_cv_m68k_is_coldfire=yes],
[gdb_cv_m68k_is_coldfire=no])
CPPFLAGS="$save_CPPFLAGS"])
;;
esac
. ${srcdir}/configure.srv
if test "${srv_mingwce}" = "yes"; then
LIBS="$LIBS -lws2"
elif test "${srv_mingw}" = "yes"; then
# WIN32APILIBS is set by GDB_AC_COMMON.
LIBS="$LIBS $WIN32APILIBS"
fi
if test "${srv_linux_usrregs}" = "yes"; then
AC_DEFINE(HAVE_LINUX_USRREGS, 1,
[Define if the target supports PTRACE_PEEKUSR for register ]
[access.])
fi
if test "${srv_linux_regsets}" = "yes"; then
AC_DEFINE(HAVE_LINUX_REGSETS, 1,
[Define if the target supports register sets.])
AC_MSG_CHECKING(for PTRACE_GETREGS)
AC_CACHE_VAL(
[gdbsrv_cv_have_ptrace_getregs],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <sys/ptrace.h>], [PTRACE_GETREGS;])],
[gdbsrv_cv_have_ptrace_getregs=yes],
[gdbsrv_cv_have_ptrace_getregs=no]
)]
)
AC_MSG_RESULT($gdbsrv_cv_have_ptrace_getregs)
if test "${gdbsrv_cv_have_ptrace_getregs}" = "yes"; then
AC_DEFINE(HAVE_PTRACE_GETREGS, 1,
[Define if the target supports PTRACE_GETREGS for register ]
[access.])
fi
AC_MSG_CHECKING(for PTRACE_GETFPXREGS)
AC_CACHE_VAL(
[gdbsrv_cv_have_ptrace_getfpxregs],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <sys/ptrace.h>], [PTRACE_GETFPXREGS;])],
[gdbsrv_cv_have_ptrace_getfpxregs=yes],
[gdbsrv_cv_have_ptrace_getfpxregs=no]
)]
)
AC_MSG_RESULT($gdbsrv_cv_have_ptrace_getfpxregs)
if test "${gdbsrv_cv_have_ptrace_getfpxregs}" = "yes"; then
AC_DEFINE(HAVE_PTRACE_GETFPXREGS, 1,
[Define if the target supports PTRACE_GETFPXREGS for extended ]
[register access.])
fi
fi
if test "${srv_linux_btrace}" = "yes"; then
AC_DEFINE(HAVE_LINUX_BTRACE, 1,
[Define if the target supports branch tracing.])
fi
dnl Some systems (e.g., Android) have lwpid_t defined in libthread_db.h.
if test "$bfd_cv_have_sys_procfs_type_lwpid_t" != yes; then
GDBSERVER_HAVE_THREAD_DB_TYPE(lwpid_t)
fi
dnl Some systems (e.g., Android) have psaddr_t defined in libthread_db.h.
if test "$bfd_cv_have_sys_procfs_type_psaddr_t" != yes; then
GDBSERVER_HAVE_THREAD_DB_TYPE(psaddr_t)
fi
dnl Check for libdl, but do not add it to LIBS as only gdbserver
dnl needs it (and gdbreplay doesn't).
old_LIBS="$LIBS"
AC_CHECK_LIB(dl, dlopen)
LIBS="$old_LIBS"
srv_thread_depfiles=
srv_libs=
if test "$srv_linux_thread_db" = "yes"; then
if test "$ac_cv_lib_dl_dlopen" = "yes"; then
srv_libs="-ldl"
AC_MSG_CHECKING(for the dynamic export flag)
old_LDFLAGS="$LDFLAGS"
# Older GNU ld supports --export-dynamic but --dynamic-list may not be
# supported there.
RDYNAMIC="-Wl,--dynamic-list=${srcdir}/proc-service.list"
LDFLAGS="$LDFLAGS $RDYNAMIC"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([],[])],
[found="-Wl,--dynamic-list"
RDYNAMIC='-Wl,--dynamic-list=$(srcdir)/proc-service.list'],
[RDYNAMIC="-rdynamic"
LDFLAGS="$old_LDFLAGS $RDYNAMIC"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([], [])],
[found="-rdynamic"],
[found="no"
RDYNAMIC=""]
)]
)
AC_SUBST(RDYNAMIC)
LDFLAGS="$old_LDFLAGS"
AC_MSG_RESULT($found)
else
srv_libs="-lthread_db"
fi
srv_thread_depfiles="thread-db.o proc-service.o"
AC_DEFINE(USE_THREAD_DB, 1, [Define if we should use libthread_db.])
AC_CACHE_CHECK(
[for TD_VERSION],
[gdbsrv_cv_have_td_version],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <thread_db.h>], [TD_VERSION;])],
[gdbsrv_cv_have_td_version=yes],
[gdbsrv_cv_have_td_version=no]
)]
)
if test "$gdbsrv_cv_have_td_version" = yes; then
AC_DEFINE(HAVE_TD_VERSION, 1, [Define if TD_VERSION is available.])
fi
fi
AC_ARG_WITH(libthread-db,
AS_HELP_STRING([--with-libthread-db=PATH], [use given libthread_db directly]),
[srv_libthread_db_path="${withval}"
srv_libs="$srv_libthread_db_path"
])
if test "$srv_libs" != "" -a "$srv_libs" != "-ldl"; then
AC_DEFINE(USE_LIBTHREAD_DB_DIRECTLY, 1, [Define if we should use libthread_db directly.])
fi
if test "$srv_xmlfiles" != ""; then
srv_xmlbuiltin="xml-builtin.o"
AC_DEFINE(USE_XML, 1, [Define if an XML target description is available.])
tmp_xmlfiles=$srv_xmlfiles
srv_xmlfiles=""
for f in $tmp_xmlfiles; do
srv_xmlfiles="$srv_xmlfiles \$(XML_DIR)/$f"
done
fi
GDBSERVER_DEPFILES="$srv_regobj $srv_tgtobj $srv_thread_depfiles"
GDBSERVER_LIBS="$srv_libs"
dnl Check whether the target supports __sync_*_compare_and_swap.
AC_CACHE_CHECK(
[whether the target supports __sync_*_compare_and_swap],
[gdbsrv_cv_have_sync_builtins],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[],
[int foo, bar;
bar = __sync_val_compare_and_swap(&foo, 0, 1);]
)],
[gdbsrv_cv_have_sync_builtins=yes],
[gdbsrv_cv_have_sync_builtins=no]
)]
)
if test "$gdbsrv_cv_have_sync_builtins" = yes; then
AC_DEFINE(HAVE_SYNC_BUILTINS, 1,
[Define to 1 if the target supports __sync_*_compare_and_swap])
fi
dnl Check for -fvisibility=hidden support in the compiler.
saved_cflags="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
[gdbsrv_cv_have_visibility_hidden=yes],
[gdbsrv_cv_have_visibility_hidden=no])
CFLAGS="$saved_cflags"
IPA_DEPFILES=""
extra_libraries=""
# check whether to enable the inprocess agent
if test "$ipa_obj" != "" \
-a "$gdbsrv_cv_have_sync_builtins" = yes \
-a "$gdbsrv_cv_have_visibility_hidden" = yes; then
have_ipa=true
else
have_ipa=false
fi
AC_ARG_ENABLE(inprocess-agent,
AS_HELP_STRING([--enable-inprocess-agent], [inprocess agent]),
[case "$enableval" in
yes) want_ipa=true ;;
no) want_ipa=false ;;
*) AC_MSG_ERROR([bad value $enableval for inprocess-agent]) ;;
esac],
[want_ipa=$have_ipa])
if $want_ipa ; then
if $have_ipa ; then
IPA_DEPFILES="$ipa_obj"
extra_libraries="$extra_libraries libinproctrace.so"
else
AC_MSG_ERROR([inprocess agent not supported for this target])
fi
fi
AC_SUBST(GDBSERVER_DEPFILES)
AC_SUBST(GDBSERVER_LIBS)
AC_SUBST(srv_xmlbuiltin)
AC_SUBST(srv_xmlfiles)
AC_SUBST(IPA_DEPFILES)
AC_SUBST(extra_libraries)
GNULIB=../gnulib/import
GNULIB_STDINT_H=
if test x"$STDINT_H" != x; then
GNULIB_STDINT_H=$GNULIB/$STDINT_H
fi
AC_SUBST(GNULIB_STDINT_H)
# Check for libiconv. It is a requirement for Linux hosts, and others hosts
# don't use it at all. Define MAYBE_LIBICONV only if the host is Linux.
AM_ICONV
MAYBE_LIBICONV=
case "$host" in
*linux*)
if test "$am_cv_func_iconv" != yes; then
AC_MSG_ERROR([could not find libiconv (required for host $host)])
fi
MAYBE_LIBICONV="$LIBICONV"
;;
esac
AC_SUBST(MAYBE_LIBICONV)
AC_CONFIG_FILES([Makefile])
AC_OUTPUT