[Libunwind-devel] Problems with libunwind and shared library

[Anteru]

Hi,

I'm trying to integrate libunwind into my code, but I'm running into a 
very weird issue with GCC.

My platform is GCC 4.8.2, Ubuntu 14.04, x86_64, using libunwind from the 
Ubuntu repositories (1.1-2.2ubuntu3.)

The setup I have is as follows: I have a shared library core.so, which 
is linking dynamically against libunwind.so. I have another executable 
test, which links against core.so. What happens now is that any 
exception thrown from core.so leads to a segfault in the test 
executable, with a callstack starting at __cxa_throw.

If I link libunwind.a statically into core.so, I get a similar error, 
but in this case I can see _Unwind_Resume from core.so (i.e. from the 
statically linked libunwind) on the callstack (and I get the complete 
callstack.) Notice that I don't actually use any of the libunwind 
functions, I merely link.

Interestingly, the exact same code works just fine when compiled using 
Clang. What's going on here? How can I resolve this issue?

Cheers,
  Anteru