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* [gcc r12-9961] libstdc++: use -D_GNU_SOURCE when building libbacktrace
@ 2023-11-06 23:13 Ian Lance Taylor
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From: Ian Lance Taylor @ 2023-11-06 23:13 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:56909c9d4842925749cd9e061ef4afa0501f85e9
commit r12-9961-g56909c9d4842925749cd9e061ef4afa0501f85e9
Author: Ian Lance Taylor <iant@golang.org>
Date: Mon Nov 6 15:12:41 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 04f2153fce3..321065aff72 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -4924,7 +4924,7 @@ 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 "$glibcxx_cv_atomic_int" = "yes"; then
@@ -4952,8 +4952,11 @@ AC_DEFUN([GLIBCXX_ENABLE_BACKTRACE], [
have_dl_iterate_phdr=no
else
# When built as a GCC target library, we can't do a link test.
+ ac_save_CPPFLAGS="$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 c07e2756974..b371f422ff3 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -77316,7 +77316,7 @@ 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 "$glibcxx_cv_atomic_int" = "yes"; then
@@ -77399,6 +77399,8 @@ done
have_dl_iterate_phdr=no
else
# When built as a GCC target library, we can't do a link test.
+ ac_save_CPPFLAGS="$CPPFLAGS"
+ CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <link.h>
@@ -77412,6 +77414,7 @@ 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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2023-11-06 23:13 [gcc r12-9961] libstdc++: use -D_GNU_SOURCE when building libbacktrace Ian Lance Taylor
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