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Re: PATCH: Add __frame_state_for for gcc 3.0.1
On Thu, Jul 05, 2001 at 12:30:51PM -0700, H . J . Lu wrote:
> I created a testcase and added some traces in frame-dwarf2.c. It turns
> out that when a pre-GCC 3.0 program throws an exception inside libc.so
> compiled with gcc 3.0, _Unwind_Find_FDE in
>
> f = _Unwind_Find_FDE (pc_target, &bases);
> if (f == 0)
> return 0;
>
> will return 0. That is _Unwind_Find_FDE cannot find the frame if you
> have mixed g++ v2 and g++ v3 frames. Do we really want to modify
> _Unwind_Find_FDE to support such a thing? I think the best we can
> do may be detect such a condition and issue a fatal error message.
It IMHO must work (although one cannot mix pre-G++ 3.0 and G++ 3.0 C++
libraries together, one should be able to mix G++ 3.0 C++ libraries with
pre-GCC 3.0 C libraries and vice versa, and C libraries can have unwinding
info). So it needs to be debugged why it cannot find it.
I'll try to allocate some time for this stuff next week unless it is fixed
by then, earliest on Wednesday. I'm sorry I cannot help with this earlier.
Jakub