[tip:x86/urgent] x86/build: Don't add -maccumulate-outgoing-args w/o compiler support

[tip-bot for Nick Desaulniers <tipbot@zytor.com>]

Commit-ID:  4a1bec4605838fd7872ec41677585e241e256785
Gitweb:     http://git.kernel.org/tip/4a1bec4605838fd7872ec41677585e241e256785
Author:     Nick Desaulniers <nick.desaulniers@gmail.com>
AuthorDate: Mon, 8 May 2017 20:29:46 -0700
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 May 2017 08:16:45 +0200

x86/build: Don't add -maccumulate-outgoing-args w/o compiler support

Clang does not support this machine dependent option.

Older versions of GCC (pre 3.0) may not support this option, added in
2000, but it's unlikely they can still compile a working kernel.

Signed-off-by: Nick Desaulniers <nick.desaulniers@gmail.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170509032946.20444-1-nick.desaulniers@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 4430dd4..5851411 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -179,7 +179,8 @@ ifdef CONFIG_JUMP_LABEL
 endif
 
 ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
-	KBUILD_CFLAGS += -maccumulate-outgoing-args
+	# This compiler flag is not supported by Clang:
+	KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,)
 endif
 
 # Stackpointer is addressed different for 32 bit and 64 bit x86