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

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Message-ID: <54F185C0.1040706@huawei.com>
Date:	Sat, 28 Feb 2015 17:09:20 +0800
From:	He Kuang <hekuang@...wei.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	<acme@...nel.org>, <aaro.koskinen@....fi>, <wangnan0@...wei.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: fix building error

Well, I've tested and it worked.

On 2015/2/28 10:49, Namhyung Kim wrote:
> Hi He,
>
> On Fri, Feb 27, 2015 at 06:05:37PM +0800, He Kuang wrote:
>> When build with ARCH=x86_64/i386, 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 | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/tools/perf/config/Makefile.arch b/tools/perf/config/Makefile.arch
>> index ff95a68..05af152 100644
>> --- a/tools/perf/config/Makefile.arch
>> +++ b/tools/perf/config/Makefile.arch
>> @@ -29,3 +29,11 @@ ifeq ($(LP64), 1)
>>   else
>>     IS_64_BIT := 0
>>   endif
>> +
>> +ifeq ($(ARCH), x86_64)
>> +  override ARCH := x86
>> +endif
>> +
>> +ifeq ($(ARCH), i386)
>> +  override ARCH := x86
>> +endif
> It seems like we need a same sed script to be applied to ARCH then.
> How about this?
>
>
> diff --git a/tools/perf/config/Makefile.arch b/tools/perf/config/Makefile.arch
> index ff95a68741d1..e29de6e3597d 100644
> --- a/tools/perf/config/Makefile.arch
> +++ b/tools/perf/config/Makefile.arch
> @@ -1,28 +1,15 @@
> +ifndef ARCH
> +ARCH := $(shell uname -m 2>/dev/null || echo not)
> +endif
>   
> -uname_M := $(shell uname -m 2>/dev/null || echo not)
> -
> -RAW_ARCH := $(shell echo $(uname_M) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
> +ARCH := $(shell echo $(ARCH) | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
> +                                  -e s/sun4u/sparc64/ \
>                                     -e s/arm.*/arm/ -e s/sa110/arm/ \
>                                     -e s/s390x/s390/ -e s/parisc64/parisc/ \
>                                     -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
>                                     -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
>                                     -e s/tile.*/tile/ )
>   
> -# Additional ARCH settings for x86
> -ifeq ($(RAW_ARCH),i386)
> -  ARCH ?= x86
> -endif
> -
> -ifeq ($(RAW_ARCH),x86_64)
> -  ARCH ?= x86
> -
> -  ifneq (, $(findstring m32,$(CFLAGS)))
> -    RAW_ARCH := x86_32
> -  endif
> -endif
> -
> -ARCH ?= $(RAW_ARCH)
> -
>   LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
>   ifeq ($(LP64), 1)
>     IS_64_BIT := 1


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