linux-kernel - [PATCH 09/17] perf tools: Fix x86 builds with ARCH specified on the command line

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Date:	Wed,  5 Sep 2012 20:08:49 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 09/17] perf tools: Fix x86 builds with ARCH specified on the command line

From: David Ahern <dsahern@...il.com>

e.g., compiling i386 on x86_64 using:
$ make -C tools/perf ARCH=i386

fails with:

    CC /tmp/pbuild/util/evsel.o
In file included from util/evsel.c:21:0:
util/perf_regs.h:5:23: fatal error: perf_regs.h: No such file or directory
compilation terminated.

Adding V=1 you see that the include argument for the arch is
'-Iarch/i386/include' is wrong. It is supposed to be -Iarch/x86/include
per the redefinition of ARCH in the Makefile.

According to the make manual,
http://www.gnu.org/software/make/manual/make.html#Override-Directive:
  "If a variable has been set with a command argument (see Overriding
   Variables), then ordinary assignments in the makefile are ignored. If
   you want to set the variable in the makefile even though it was set
   with a command argument, you can use an override directive ..."

Make it so.

Signed-off-by: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1346094354-74356-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Makefile |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 722ddee..939cf6d 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -64,12 +64,12 @@ AR = $(CROSS_COMPILE)ar
 
 # Additional ARCH settings for x86
 ifeq ($(ARCH),i386)
-	ARCH := x86
+	override ARCH := x86
 	NO_PERF_REGS := 0
 	LIBUNWIND_LIBS = -lunwind -lunwind-x86
 endif
 ifeq ($(ARCH),x86_64)
-	ARCH := x86
+	override ARCH := x86
 	IS_X86_64 := 0
 	ifeq (, $(findstring m32,$(EXTRA_CFLAGS)))
 		IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -xc - | tail -n 1)
-- 
1.7.1

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