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

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Date:	Thu, 12 Feb 2015 17:07:18 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	He Kuang <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

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


>  
>    ifneq (, $(findstring m32,$(CFLAGS)))
>      RAW_ARCH := x86_32
> -- 
> 2.2.0.33.gc18b867
> 
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