Comment 1 for bug 1336912

actually when I tried to rebuild libunwind by myself I found that there are a lot of warnings printed during packaging process. Like:

dpkg-shlibdeps: warning: symbol lzma_index_buffer_decode used by debian/libunwind8/usr/lib/i386-linux-gnu/libunwind-x86.so.8.0.1 found in none of the libraries
(about 20 such warnings)

Looks like lzma compression for symbols is a relatively new feature and not fully tested on all architectures. I created a fix which solves problem and removes all warnings on x86 platform. Sorry, I do not have x86_64 to test how it works there