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Re: PATCH: Add __frame_state_for for gcc 3.0.1
On Thu, Jul 05, 2001 at 09:32:41AM -0700, H . J . Lu wrote:
> I think the current gcc default to -shared-libgcc for DSOs and
> -static-libgcc for executables. It is ok for non-C++/Java
> executables. But -shared-libgcc may be needed for C++/Java
> executables.
Why? They'd be linked against libstdc++.so.3 or libgcj, which were compiled
with the default -shared-libgcc.
> > I think the important part of the patch now is really the missing DW_EH_PE_*
> > handling stuff.
>
> I can always abort -). Does it only happen when a pre-G++ 3.0
> binary throw an exception inside libc.so?
If just libc.so was compiled using GCC 3.0 in a pre-GCC 3.0 program and it
throws an exception through qsort or the likes, it will abort. That's
undesirable.
> Here is a minor update which exports _Unwind_Find_FDE and
> adds the conditional support for gcc 3.0.
The question is whether version of gcc glibc was compiled with should
influence what symbols are exported from glibc. If it is possible, then fine
(but you probably could remove the %ifdefs from Versions file, if the symbol
does not exist, glibc will not export it.
If it should not, then we need to take gcc 2.95.x's frame.c and hack in _bases
variants and _Unwind_Find_FDE access interface.
Jakub