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 --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 04f2153fce3b6c54f82be1da7f1292f4c4c7a4da..321065aff726c1630842aedc22d07b0c4036c165 100644 (file)
--- 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 c07e27569743cbcbf4f7c89a288c92091d446e93..b371f422ff3d46ecb0d148093174d6659aa38fee 100755 (executable)
--- 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"