[PATCH] i386: disable sse in rtld-divdi3.os

[Aurelien Jarno]

When compiling the GNU libc on i386 using GCC 6 and for a CPU with SSE
support (e.g. -march=pentium4, -march=core2, -march=haswell, ...) the
rtld-divdi3.os file ends up with SSE instructions using the XMM
registers. This makes the elf/tst-ld-sse-use test to fail:

  function __udivdi3 in rtld-divdi3.os modifies xmm/ymm/zmm

Modify sysdeps/i386/Makefile to compile this file with -mno-sse -mno-mmx
-mfpmath=387 like it is already done for other files used by ld.so.

Changelog:
	* sysdeps/i386/Makefile [$(subdir) == csu] (CFLAGS-rtld-divdi3.os):
	New. Set to -mno-sse -mno-mmx -mfpmath=387.
---
 ChangeLog             | 5 +++++
 sysdeps/i386/Makefile | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 234a3cc..efb5ef4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2016-07-14  Aurelien Jarno  <aurelien@aurel32.net>
+
+	* sysdeps/i386/Makefile [$(subdir) == csu] (CFLAGS-rtld-divdi3.os):
+	New. Set to -mno-sse -mno-mmx -mfpmath=387.
+
 2016-07-13  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
 	* bits/termios.h (TABDLY): Change macro to include TAB3 bit too.
diff --git a/sysdeps/i386/Makefile b/sysdeps/i386/Makefile
index 6c91842..33e74df 100644
--- a/sysdeps/i386/Makefile
+++ b/sysdeps/i386/Makefile
@@ -98,3 +98,6 @@ $(objpfx)tst-ld-sse-use.out: ../sysdeps/i386/tst-ld-sse-use.sh $(objpfx)ld.so
 	$(BASH) $< $(objpfx) '$(NM)' '$(OBJDUMP)' '$(READELF)' > $@; \
 	$(evaluate-test)
 endif
+ifeq ($(subdir),csu)
+CFLAGS-rtld-divdi3.os += -mno-sse -mno-mmx -mfpmath=387
+endif
-- 
2.8.1