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

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Date:	Mon, 29 Dec 2014 16:56:07 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org, lizefan@...wei.com,
	acme@...nel.org, jolsa@...nel.org
Subject: Re: [PATCH] perf: fix building error in x86_64 when dwarf unwind is
 on

Hi Wang,

(Adding Arnaldo and Jiri to CC)

On Sat, Dec 27, 2014 at 09:26:11AM +0800, Wang Nan wrote:
> When build with 'make ARCH=x86' and dwarf unwind is on, there is a
> compiling error:
> 
>    CC       /home/wn/perf/arch/x86/util/unwind-libdw.o
>    CC       /home/wn/perf/arch/x86/tests/regs_load.o
>  arch/x86/tests/regs_load.S: Assembler messages:
>  arch/x86/tests/regs_load.S:65: Error: operand type mismatch for `push'
>  arch/x86/tests/regs_load.S:72: Error: operand type mismatch for `pop'
>  make[1]: *** [/home/wn/perf/arch/x86/tests/regs_load.o] Error 1
>  make[1]: INTERNAL: Exiting with 25 jobserver tokens available; should be 24!
>  make: *** [all] Error 2
>  ...
> 
> Which is caused by incorrectly undefine macro HAVE_ARCH_X86_64_SUPPORT.
> 'config/Makefile.arch' tests __x86_64__ only when 'ARCH=x86_64'. However,
> with 'ARCH=x86', the underlying compile may also be x86_64, which causes
> mismatching.

Hmm.. how did you compile this?  I guess ARCH=x86 requires -m32 flag
to the gcc, did you pass it (like via EXTRA_CFLAGS=-m32)?

I'm confused by 'underlying compile may also be x86_64' part..

Thanks,
Namhyung


> 
> This patch fixes it by checking __x86_64__ in both case of
> 'ARCH=x86_64' and 'ARCH=x86'.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> ---
>  tools/perf/config/Makefile.arch | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/perf/config/Makefile.arch b/tools/perf/config/Makefile.arch
> index 851cd01..303a096 100644
> --- a/tools/perf/config/Makefile.arch
> +++ b/tools/perf/config/Makefile.arch
> @@ -15,6 +15,8 @@ endif
>  
>  ifeq ($(ARCH),x86_64)
>    override ARCH := x86
> +endif
> +ifeq ($(ARCH),x86)
>    IS_X86_64 := 0
>    ifeq (, $(findstring m32,$(CFLAGS)))
>      IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -x c - | tail -n 1)
> -- 
> 1.8.4
> 
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