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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?
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