[Bug target/55061] libbacktrace build fails during bootstrap on powerpc-apple-darwin9

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55061

--- Comment #17 from Ian Lance Taylor <ian at airs dot com> 2012-10-25 17:41:26 UTC ---
Thanks for attaching the config.log.  The config.log suggests that this
program:

int
main ()
{
  return _Unwind_GetIPInfo ();
}

both compiles and links when using GCC 4.0.1 on Darwin.  That would be a
surprising result, as it does not link when using the FSF GCC 4.0.1:
_Unwind_GetIPInfo is undefined.  Apparently with GCC 4.0.1 on Darwin
_Unwind_GetIPInfo is defined somewhere.

Can you verify that?  If that is correct, then the configure script needs to
check not only that _Unwind_GetIPInfo is available at link time, but also that
it is declared in unwind.h.