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SubjectRe: [PATCH] perf: fix building error in x86_64 when dwarf unwind is on
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On 2014/12/29 16:14, Wang Nan wrote:
> On 2014/12/29 15:56, Namhyung Kim wrote:
>> 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..
>>
>
> I hit this problem when building perf with Yocto (https://www.yoctoproject.org/), which
> is a famous building system for embeded system.
>
> When building kernel, we can simply use 'make ARCH=x86' and select 'CONFIG_64BIT'
> in menuconfig to get a x86_64 kernel. As a result, there building framework
> like Yocto doesn't ever consider 'x86_64' as a valid ARCH option. See:
> https://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/classes/kernel-arch.bbclass
> Therefore, when building with such framework, it uses a x86_64 compiler and ARCH=x86.
>
>> 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@huawei.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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