PATCH: Put libunwind.a in libgcc_s.so: versioning of _Unwind_*() symbols

[David Mosberger]

>>>>> On Wed, 21 Apr 2004 10:13:06 -0700, "H. J. Lu" <hjl@lucon.org> said:

  HJ> The unwinder in gcc is C++ ABI-compliant.

No, it isn't.  Not as long as it defines ABI-defined symbols as
versioned symbols.  That means anything that got linked against
libgcc_s will never be able to use the ABI-defined symbols from
another library (such as libunwind).

>>>>> On Wed, 21 Apr 2004 10:13:06 -0700, "H. J. Lu" <hjl@lucon.org> said:
  HJ> The unwinder in gcc is C++ ABI-compliant. But it doesn't mean
  HJ> you can mix 2 unwind libraries together. As soon as you did

  HJ> # g++ -shared ...

  HJ> you may already have linked part of whatever unwind library gcc
  HJ> is using into the resulting shared library. It won't be easy to
  HJ> use another unwind library after that.

Nonsense.  LD_PRELOAD=/usr/lib/libunwind.so would do just fine.

The problem isn't even libunwind-specific, as my example from
yesterday evening showed.

	--david