linux-kernel - Re: [PATCH] perf: fix building error in x86

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Date:	Fri, 13 Feb 2015 14:31:06 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Hekuang <hekuang@...wei.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org, wangnan0@...wei.com
Subject: Re: [PATCH] perf: fix building error in x86_64

On Thu, Feb 12, 2015 at 04:56:44PM +0800, Hekuang wrote:
> 
> 在 2015/2/12 16:07, Namhyung Kim 写道:
> >Hi,
> >
> >On Wed, Feb 11, 2015 at 10:01:08AM +0800, He Kuang wrote:
> >>When build with ARCH=x86_64, perf failed to compile with following error:
> >>
> >>tests/builtin-test.o:(.data+0x158): undefined reference to `test__perf_time_to_tsc'
> >>collect2: error: ld returned 1 exit status
> >>Makefile.perf:632: recipe for target 'perf' failed
> >>...
> >>
> >>Which is caused commit c6e5e9fbc3ea1 ("perf tools: Fix building error
> >>in x86_64 when dwarf unwind is on"), ARCH test in Makefile.perf
> >>conflicts with tests/builtin-test.c's __x86_64__.
> >>To x86/x86_64 platform, ARCH should always override to x86 while
> >>IS_64_BIT stands for the actual architecture.
> >>
> >>Signed-off-by: He Kuang <hekuang@...wei.com>
> >>---
> >>  tools/perf/config/Makefile.arch | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >>diff --git a/tools/perf/config/Makefile.arch b/tools/perf/config/Makefile.arch
> >>index ff95a68..8c6214d 100644
> >>--- a/tools/perf/config/Makefile.arch
> >>+++ b/tools/perf/config/Makefile.arch
> >>@@ -14,7 +14,7 @@ ifeq ($(RAW_ARCH),i386)
> >>  endif
> >>  ifeq ($(RAW_ARCH),x86_64)
> >>-  ARCH ?= x86
> >>+  override ARCH := x86
> >Hmm.. wouldn't it (again) break cross build then?
> >
> >Thanks,
> >Namhyung
> >
> 
> 
> I've tested both 'make ARCH=x86' and 'make ARCH=x86_64' cases after a
> 'make clean'.
> 
> The issue was first caused by IS_X86_64 flag wrongly cleared when
> ARCH=x86, which is already fixed by separating IS_64_BIT and ARCH in
> commit c6e5e9fbc3ea1 ("perf tools: Fix building error in x86_64 when
> dwarf unwind is on").
> 
> The only problem here is we should let ARCH override to x86, to keep
> compatible with 'ifeq ($(ARCH),x86)'.
> >>    ifneq (, $(findstring m32,$(CFLAGS)))
> >>      RAW_ARCH := x86_32

Have you tried a cross build like 'make ARCH=arm' also?

Thanks,
Namhyung
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