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* [gcc r14-5173] libstdc++: use -D_GNU_SOURCE when building libbacktrace
@ 2023-11-06 23:11 Ian Lance Taylor
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From: Ian Lance Taylor @ 2023-11-06 23:11 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:2b64e4a54042fb8f75f1c1429eb1c13afb9fa118
commit r14-5173-g2b64e4a54042fb8f75f1c1429eb1c13afb9fa118
Author: Ian Lance Taylor <iant@golang.org>
Date: Mon Nov 6 15:09:18 2023 -0800
libstdc++: use -D_GNU_SOURCE when building libbacktrace
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.
Diff:
---
libstdc++-v3/acinclude.m4 | 5 ++++-
libstdc++-v3/configure | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 654b99e92d7..77569d5bb59 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -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"
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index a4b12de1f8a..155faf51922 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -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"
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