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Use -std=gnu11 instead of -std=gnu99
- From: Joseph Myers <joseph at codesourcery dot com>
- To: <libc-alpha at sourceware dot org>
- Date: Tue, 27 Oct 2015 17:10:11 +0000
- Subject: Use -std=gnu11 instead of -std=gnu99
- Authentication-results: sourceware.org; auth=none
Now that GCC 4.7 or later is required to build glibc, this patch moves
the build from using -std=gnu99 to -std=gnu11 (option added in 4.7).
This allows use of C11 features from GCC's headers, such as new
float.h macros and max_align_t.
Tested for x86_64 and x86 (testsuite; installed stripped shared
libraries are unchanged by the patch on x86_64, while I see some
slight code reordering of no significance on x86).
2015-10-27 Joseph Myers <joseph@codesourcery.com>
* Makeconfig (CFLAGS): Use -std=gnu11 instead of -std=gnu99.
* Makefile ($(objpfx)c++-types-check.out): Filter out -std=gnu11
instead of -std=gnu99.
* configure.ac (systemtap): Test with -std=gnu11 instead of
-std=gnu99.
* configure: Regenerated.
* math/gen-auto-libm-tests.c: Use -std=gnu11 instead of -std=gnu99
in compilation command in comment.
diff --git a/Makeconfig b/Makeconfig
index c0f5e64..3c5d71e 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -882,7 +882,7 @@ CPPFLAGS = $(config-extra-cppflags) $(CPPUNDEFS) $(CPPFLAGS-config) \
$(foreach lib,$(libof-$(basename $(@F))) \
$(libof-$(<F)) $(libof-$(@F)),$(CPPFLAGS-$(lib))) \
$(CPPFLAGS-$(<F)) $(CPPFLAGS-$(@F)) $(CPPFLAGS-$(basename $(@F)))
-override CFLAGS = -std=gnu99 -fgnu89-inline $(config-extra-cflags) \
+override CFLAGS = -std=gnu11 -fgnu89-inline $(config-extra-cflags) \
$(filter-out %frame-pointer,$(+cflags)) $(+gccwarn-c) \
$(sysdep-CFLAGS) $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) \
$(CFLAGS-$(@F)) $(tls-model) \
diff --git a/Makefile b/Makefile
index 8ab0dbc..1d800e3 100644
--- a/Makefile
+++ b/Makefile
@@ -256,7 +256,7 @@ ifneq ($(CXX),no)
vpath c++-types.data $(+sysdep_dirs)
$(objpfx)c++-types-check.out: c++-types.data scripts/check-c++-types.sh
- scripts/check-c++-types.sh $< $(CXX) $(filter-out -std=gnu99 $(+gccwarn-c),$(CFLAGS)) $(CPPFLAGS) > $@; \
+ scripts/check-c++-types.sh $< $(CXX) $(filter-out -std=gnu11 $(+gccwarn-c),$(CFLAGS)) $(CPPFLAGS) > $@; \
$(evaluate-test)
endif
diff --git a/configure b/configure
index 8f4bb72..49ea581 100755
--- a/configure
+++ b/configure
@@ -3580,7 +3580,7 @@ if ${libc_cv_sdt+:} false; then :
$as_echo_n "(cached) " >&6
else
old_CFLAGS="$CFLAGS"
- CFLAGS="-std=gnu99 $CFLAGS"
+ CFLAGS="-std=gnu11 $CFLAGS"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <sys/sdt.h>
diff --git a/configure.ac b/configure.ac
index ad5f3cc..e5c8d46 100644
--- a/configure.ac
+++ b/configure.ac
@@ -353,7 +353,7 @@ AC_ARG_ENABLE([systemtap],
if test "x$systemtap" != xno; then
AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
old_CFLAGS="$CFLAGS"
- CFLAGS="-std=gnu99 $CFLAGS"
+ CFLAGS="-std=gnu11 $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
void foo (int i, void *p)
{
diff --git a/math/gen-auto-libm-tests.c b/math/gen-auto-libm-tests.c
index 03ec6c4..2b7bb5a 100644
--- a/math/gen-auto-libm-tests.c
+++ b/math/gen-auto-libm-tests.c
@@ -18,7 +18,7 @@
/* Compile this program as:
- gcc -std=gnu99 -O2 -Wall -Wextra gen-auto-libm-tests.c -lmpc -lmpfr -lgmp \
+ gcc -std=gnu11 -O2 -Wall -Wextra gen-auto-libm-tests.c -lmpc -lmpfr -lgmp \
-o gen-auto-libm-tests
(use of current MPC and MPFR versions recommended) and run it as:
--
Joseph S. Myers
joseph@codesourcery.com