perf tools, x86: Fix 32-bit compile on 64-bit system

Builds for 32-bit perf binaries on a 64-bit host currently fail
with this error:

 [...]
 bench/../../../arch/x86/lib/memcpy_64.S: Assembler messages:
 bench/../../../arch/x86/lib/memcpy_64.S:29: Error: bad register name `%rdi'
 bench/../../../arch/x86/lib/memcpy_64.S:34: Error: invalid instruction suffix for `movs'
 bench/../../../arch/x86/lib/memcpy_64.S:50: Error: bad register name `%rdi'
 bench/../../../arch/x86/lib/memcpy_64.S:61: Error: bad register name `%rdi'
 ...

The problem is the detection of the host arch without considering passed in
flags. This change fixes 32-bit builds via:

make EXTRA_CFLAGS=-m32

and 64-bit builds still reference the memcpy_64.S.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/1310420304-21452-1-git-send-email-dsahern@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 940257b5774ec209d09e3b2d4fbee647ff86dd71..c16836611d223d17041cdca5dfa0dc67aaf4d1fc 100644 (file)
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -52,7 +52,10 @@ ifeq ($(ARCH),i386)
 endif
 ifeq ($(ARCH),x86_64)
        ARCH := x86
-       IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -xc - | tail -n 1)
+       IS_X86_64 := 0
+       ifeq (, $(findstring m32,$(EXTRA_CFLAGS)))
+               IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -xc - | tail -n 1)
+       endif
        ifeq (${IS_X86_64}, 1)
                RAW_ARCH := x86_64
                ARCH_CFLAGS := -DARCH_X86_64