problems compiling gcc 2.95.[12] for sparc64-linux using --with-cpu=sparc

[Ben Collins <bcollins at debian dot org>]

I've been trying to get the latest gcc to compile for sparc64-linux using
a default of --with-cpu=sparc, so I have a normal sparc32 compiler with
the ability to compile with -m64. cc1 seems to be working fine and without
problems, however cc1plus creates really bad problems (this is all with
-m32, I don't really need -m64 for cc1plus).

When I link with the generated libstdc++ I get missing symbols reported to
the affect of "bad_alloc table" and "exception table(?)". I've tried
tracking this down for a good few weeks, and I have no idea where it even
begins to happen. By logic, I assume it is a (mis)define in
config/sparc/linux64.h, but which one, and how is evading my search.

Note, these problems don't show up if I compile a straight sparc-linux
compiler (which should produce the same code as sparc64-linux with -m32)
and the cc1plus problems still show up when using known good libstdc++
libraries (but in the compiled objects, not the library).

Help appreciated,
 Ben