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Re: [PATCH] Fix DW_CFA_set_loc handling
- From: Eric Botcazou <ebotcazou at adacore dot com>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: binutils at sources dot redhat dot com
- Date: Tue, 26 Sep 2006 14:56:40 +0200
- Subject: Re: [PATCH] Fix DW_CFA_set_loc handling
- References: <20060926123840.GA4556@sunsite.mff.cuni.cz>
Jakub,
> Recent http://gcc.gnu.org/PR22313 change (including gcc 4.1 branch) started
> (unnecessarily) using DW_CFA_set_loc at the start of all FDEs, but
> unfortunately linker .eh_frame optimizations didn't handle that well.
> If FDE encoding is pc relative or linker is changing it from absptr
> to pc relative, we need to adjust the DW_CFA_set_loc operand accordingly.
>
> Tested with make check on x86_64-linux, visual inspection of x86_64
> readelf -wf libc.so.6 (this was seriously broken before) and visual
> inspection of a hacked up test for absptr -> pcrel conversion.
This sounds a bit frightening, not everyone can afford to use binutils
mainline with the 4.1.x compiler. We already found a nasty fallout
http://gcc.gnu.org/ml/gcc-patches/2006-09/msg00285.html
so the change seems to be really destabilizing at this point.
Would you be OK to jointly ask Roger to back it out on the 4.1 branch?
--
Eric Botcazou