------- Comment #16 from amylaar at gcc dot gnu dot org 2009-03-08 14:37
-------
(In reply to comment #9)
> The darwin -m64 failures are then the same problem, cross-jumping of noreturn
> calls between different level of stack depths.
> I've been wrong about DW_CFA_GNU_args_size being useless for cfa.reg !=
> STACK_POINTER_REGNUM, while such directives won't ever be used by the libgcc
> unwinder, they might be used by debuggers to set correct value of stack
> pointer,
> and therefore such directives aren't useless and so we should avoid
> crossjumping
> in that case.
It is a valid size optimization, so if the unwinder doesn't need the directive
to be always correct, we should do this optimization for -Os unless you also
specify -O1. Optimization levels above -O1 are known to give imperfect debug
information. And -O1 defaults to -fno-crossjumping .
--
amylaar at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amylaar at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37022
