Use -std=gnu11 instead of -std=gnu99.

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).

	* 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.

1 files changed, 9 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index a9cfb3b397..54471b2423 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
 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.
+
 	* sysdeps/nptl/configure.ac: Remove file.
 	* sysdeps/nptl/configure: Remove generated file.
 	* configure.ac (libc_cv_forced_unwind): Do not substitute.