On Fri, May 20, 2016 at 10:59:05AM +0800, Hekuang wrote: > 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:
we will need to extend LIBUNWIND_DIR or add variable, to be able to detect this from arbitrary directory jirka
