Re: [patch] Fix gdb.cp/gdb2495.exp regression with gcc-4.7

Jan Kratochvil
2012-01-02T14:20:04Z

On Mon, 02 Jan 2012 15:09:42 +0100, Pedro Alves wrote:
> I'm confused. Shouldn't this instead be handled in the unwind
> machinery? Is this subtraction you refer to the
> get_frame_address_in_block one? That already has special
> handling for something like this. Why doesn't it work?

This `- 1' is in inferior's:

gcc/libgcc/unwind-dw2.c:
uw_frame_state_for:
fde = _Unwind_Find_FDE (context->ra + _Unwind_IsSignalFrame (context) - 1,
&context->bases);

GDB can only change the address put on inferior stack and later picked up by
the inferior's exceptions unwinder.

Thanks,
Jan