With --disable-optimization, _FORTIFY_SOURCE=3 produces compiler
warnings/errors:
/usr/include/features.h:422:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
422 | # warning _FORTIFY_SOURCE requires compiling with optimization (-O)
Before enabling it for --enable-maintainer-mode, check the compiler
doesn't fail when using the flag.
---
acinclude.m4 | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/acinclude.m4 b/acinclude.m4
index 9f2dc302e..168117840 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -65,7 +65,6 @@ AC_DEFUN([COMPILER_FLAGS], [
with_cflags="$with_cflags -DG_DISABLE_DEPRECATED"
with_cflags="$with_cflags -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_28"
with_cflags="$with_cflags -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_32"
- with_cflags="$with_cflags -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3"
fi
AC_SUBST([WARNING_CFLAGS], $with_cflags)
])
@@ -136,6 +135,21 @@ AC_DEFUN([MISC_FLAGS], [
misc_cflags="$misc_cflags --coverage"
misc_ldflags="$misc_ldflags --coverage"
fi
+ if (test "$USE_MAINTAINER_MODE" = "yes"); then
+ AC_CACHE_CHECK([whether ${CC-cc} accepts -D_FORTIFY_SOURCE=3],
+ ac_cv_prog_cc_fortify_source_3, [
+ echo '#include <errno.h>' > fortify.c
+ if test -z "`${CC-cc} ${CFLAGS} ${misc_cflags} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -c fortify.c 2>&1`"; then
+ ac_cv_prog_cc_fortify_source_3=yes
+ else
+ ac_cv_prog_cc_fortify_source_3=no
+ fi
+ rm -f fortify.c fortify.o
+ ])
+ if test "${ac_cv_prog_cc_fortify_source_3}" = "yes"; then
+ misc_cflags="$misc_cflags -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3"
+ fi
+ fi
misc_cflags="$misc_cflags -ffunction-sections -fdata-sections"
misc_ldflags="$misc_ldflags -Wl,--gc-sections"
AC_SUBST([MISC_CFLAGS], $misc_cflags)
--
2.48.1
