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-rw-r--r--m4/acinclude.m412
1 files changed, 9 insertions, 3 deletions
diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
index 4455d261..f57a515e 100644
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
@@ -40,11 +40,15 @@ AC_DEFUN([GCC_STACK_PROTECT_CC],[
dnl GCC_FORTIFY_SOURCE_CC
dnl checks -D_FORTIFY_SOURCE with the C compiler, if it exists then updates
-dnl CFLAGS
+dnl CPPFLAGS
AC_DEFUN([GCC_FORTIFY_SOURCE_CC],[
AC_LANG_ASSERT(C)
if test "X$CC" != "X"; then
AC_MSG_CHECKING(for FORTIFY_SOURCE support)
+ fs_old_cppflags="$CPPFLAGS"
+ fs_old_cflags="$CFLAGS"
+ CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
+ CFLAGS="$CFLAGS -Werror"
AC_TRY_COMPILE([#include <features.h>], [
int main() {
#if !(__GNUC_PREREQ (4, 1) )
@@ -54,10 +58,12 @@ AC_DEFUN([GCC_FORTIFY_SOURCE_CC],[
}
], [
AC_MSG_RESULT(yes)
- CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
+ CFLAGS="$df_old_cflags"
], [
AC_MSG_RESULT(no)
- ])
+ CPPFLAGS="$df_old_cppflags"
+ CFLAGS="$df_old_cflags"
+ ])
fi
])