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libstdc++: use -D_GNU_SOURCE when building libbacktrace

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PR libbacktrace/111315
	PR libbacktrace/112263
	* acinclude.m4: Set -D_GNU_SOURCE in BACKTRACE_CPPFLAGS and when
	grepping link.h for dl_iterate_phdr.
	* configure: Regenerate.
This commit is contained in:
Ian Lance Taylor 2023-11-06 15:09:18 -08:00
parent 471fb6ee43
commit 2b64e4a540
2 changed files with 8 additions and 2 deletions
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5
libstdc++-v3/acinclude.m4
View file

@ -5443,7 +5443,7 @@ AC_DEFUN([GLIBCXX_ENABLE_BACKTRACE], [
# Most of this is adapted from libsanitizer/configure.ac
BACKTRACE_CPPFLAGS=
BACKTRACE_CPPFLAGS="-D_GNU_SOURCE"
# libbacktrace only needs atomics for int, which we've already tested
if test "$glibcxx_cv_atomic_int" = "yes"; then
@ -5471,8 +5471,11 @@ AC_DEFUN([GLIBCXX_ENABLE_BACKTRACE], [
have_dl_iterate_phdr=no
else
# When built as a GCC target library, we can't do a link test.
ac_save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
[have_dl_iterate_phdr=no])
CPPFLAGS="$ac_save_CPPFLAGS"
fi
if test "$have_dl_iterate_phdr" = "yes"; then
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_DL_ITERATE_PHDR=1"

5
libstdc++-v3/configure vendored
View file

@ -73299,7 +73299,7 @@ fi
# Most of this is adapted from libsanitizer/configure.ac
BACKTRACE_CPPFLAGS=
BACKTRACE_CPPFLAGS="-D_GNU_SOURCE"
# libbacktrace only needs atomics for int, which we've already tested
if test "$glibcxx_cv_atomic_int" = "yes"; then
@ -73382,6 +73382,8 @@ done
have_dl_iterate_phdr=no
else
# When built as a GCC target library, we can't do a link test.
ac_save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <link.h>
@ -73395,6 +73397,7 @@ else
fi
rm -f conftest*
CPPFLAGS="$ac_save_CPPFLAGS"
fi
if test "$have_dl_iterate_phdr" = "yes"; then
BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_DL_ITERATE_PHDR=1"