From b1e0d8b70fa31821ebca3965f2ef8619d7c5e316 Mon Sep 17 00:00:00 2001
From: Jean Delvare <jdelvare@suse.de>
Date: Tue, 2 Oct 2012 16:42:36 +0200
Subject: kbuild: Fix gcc -x syntax

The correct syntax for gcc -x is "gcc -x assembler", not
"gcc -xassembler". Even though the latter happens to work, the former
is what is documented in the manual page and thus what gcc wrappers
such as icecream do expect.

This isn't a cosmetic change. The missing space prevents icecream from
recognizing compilation tasks it can't handle, leading to silent kernel
miscompilations.

Besides me, credits go to Michael Matz and Dirk Mueller for
investigating the miscompilation issue and tracking it down to this
incorrect -x parameter syntax.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Cc: Bernhard Walle <bernhard@bwalle.de>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
---
 tools/perf/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'tools/perf/Makefile')

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 77f124fe57ad..d9776568e8cd 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -62,7 +62,7 @@ ifeq ($(ARCH),x86_64)
 	ARCH := x86
 	IS_X86_64 := 0
 	ifeq (, $(findstring m32,$(EXTRA_CFLAGS)))
-		IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -xc - | tail -n 1)
+		IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -x c - | tail -n 1)
 	endif
 	ifeq (${IS_X86_64}, 1)
 		RAW_ARCH := x86_64
-- 
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