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SubjectRe: [PATCH v4 2/6] perf tools: Promote proper messages for cross-platform unwind
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hi

在 2016/5/20 0:46, Jiri Olsa 写道:
> On Thu, May 19, 2016 at 11:47:38AM +0000, He Kuang wrote:
>
> SNIP
>
>> #endif /* ARCH_PERF_COMMON_H */
>> diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
>> index 1e46277..a86b864 100644
>> --- a/tools/perf/config/Makefile
>> +++ b/tools/perf/config/Makefile
>> @@ -345,6 +345,12 @@ ifeq ($(ARCH),powerpc)
>> endif
>>
>> ifndef NO_LIBUNWIND
>> + ifeq ($(feature-libunwind-x86), 1)
>> + LIBUNWIND_LIBS += -lunwind-x86
>> + $(call detected,CONFIG_LIBUNWIND_X86)
>> + CFLAGS += -DHAVE_LIBUNWIND_X86_SUPPORT
>> + endif
>> +
> how does one install that lirary?
>
> thanks,
> jirka

My work environment is on an old suse distribution, so it's
difficult to find libunwind-$arch rpm packages, so I build them
from source.

The git repository url is here:
http://git.savannah.gnu.org/r/libunwind.git(master)

Then flow the build step in README, first for i686:

$ ./autogen.sh
$ ./configure prefix=/xx/dst_i686 --target=i686-oe-linux
CC=x86_64-oe-linux-gcc
$ make && make install

Similar for aarch64:

$ make clean
$ ./configure prefix=/xx/dst_aarch64 --target=i686-oe-linux
CC=x86_64-oe-linux-gcc
$ make && make install

NOTICE: the contents in '--target' should be like
'i686-oe-linux', only give 'i686' cause strange build errors.

It looks like that libunwind don't support building for multiple
platforms at the same time, so I build them separately into
different directories.

Finally, copy the outputs into /usr/include and /usr/lib64, now
perf can detect them:

$ make VF=1 ARCH=x86_64 CROSS_COMPILE=x86_64-oe-linux-
EXTRA_CFLAGS="-m64"
...

... libunwind-x86: [ on ]
... libunwind-x86_64: [ OFF ]
... libunwind-arm: [ OFF ]
... libunwind-aarch64: [ on ]

Thanks.


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