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config: Sync largefile.m4 from binutils-gdb

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The following patch improves handling of largefile support with procfs
on 32-bit Solaris.  It has already been approved and installed for
binutils-gdb in the thread starting at

	[PATCH] Unify Solaris procfs and largefile handling
        https://sourceware.org/pipermail/gdb-patches/2020-June/169977.html

I'm syncing the config/largefile.m4 part to gcc now which is the master
for config.  Since ACX_LARGEFILE isn't used anywhere in the gcc tree,
I'm installing it as obvious.

2020-09-09  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	config:
	* largefile.m4: Sync from binutils-gdb.
This commit is contained in:
Rainer Orth 2020-09-09 11:02:01 +02:00
parent fb51be60c8
commit 0d7d52131a
1 changed files with 33 additions and 12 deletions
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45
config/largefile.m4
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@ -1,5 +1,5 @@
# This macro wraps AC_SYS_LARGEFILE with one exception for Solaris.
# PR 9992/binutils: We have to replicate everywhere the behaviour of
# PR binutils/9992: We have to replicate everywhere the behaviour of
# bfd's configure script so that all the directories agree on the size
# of structures used to describe files.
@ -16,17 +16,38 @@ AC_REQUIRE([AC_CANONICAL_TARGET])
AC_PLUGINS
case "${host}" in
changequote(,)dnl
sparc-*-solaris*|i[3-7]86-*-solaris*)
changequote([,])dnl
# On native 32bit sparc and ia32 solaris, large-file and procfs support
# are mutually exclusive; and without procfs support, the bfd/ elf module
# cannot provide certain routines such as elfcore_write_prpsinfo
# or elfcore_write_prstatus. So unless the user explicitly requested
# large-file support through the --enable-largefile switch, disable
# large-file support in favor of procfs support.
test "${target}" = "${host}" -a "x$plugins" = xno \
&& : ${enable_largefile="no"}
sparc-*-solaris*|i?86-*-solaris*)
# On native 32-bit Solaris/SPARC and x86, large-file and procfs support
# were mutually exclusive until Solaris 11.3. Without procfs support,
# the bfd/ elf module cannot provide certain routines such as
# elfcore_write_prpsinfo or elfcore_write_prstatus. So unless the user
# explicitly requested large-file support through the
# --enable-largefile switch, disable large-file support in favor of
# procfs support.
#
# Check if <sys/procfs.h> is incompatible with large-file support.
AC_TRY_COMPILE([#define _FILE_OFFSET_BITS 64
#define _STRUCTURED_PROC 1
#include <sys/procfs.h>], , acx_cv_procfs_lfs=yes, acx_cv_procfs_lfs=no)
#
# Forcefully disable large-file support only if necessary, gdb is in
# tree and enabled.
if test "${target}" = "${host}" -a "$acx_cv_procfs_lfs" = no \
-a -d $srcdir/../gdb -a "$enable_gdb" != no; then
: ${enable_largefile="no"}
if test "$plugins" = yes; then
AC_MSG_WARN([
plugin support disabled; require large-file support which is incompatible with GDB.])
plugins=no
fi
fi
#
# Explicitly undef _FILE_OFFSET_BITS if enable_largefile=no for the
# benefit of g++ 9+ which predefines it on Solaris.
if test "$enable_largefile" = no; then
LARGEFILE_CPPFLAGS="-U_FILE_OFFSET_BITS"
AC_SUBST(LARGEFILE_CPPFLAGS)
fi
;;
esac