Hi Jeff,

>>> Thanks for the patch.  I'll let you and Jason decide which style solution
>>> is preferred.
>> This also breaks bootstrap on Darwin at least, so an early solution would be
>> welcome (the fix here allows bootstrap to continue, testing on-going).
>> thanks,
>
> I'm using it in the automated tester as well -- without all the *-elf
> targets would fail to build libgcc.

things are even worse on targets that lack constructor priority support,
like Solaris 11.3 and Mac OS X 10.7/Darwin 11:

In file included from /vol/gcc/src/hg/master/local/libgcc/unwind-dw2-fde-dip.c:97:
/vol/gcc/src/hg/master/local/libgcc/unwind-dw2-fde.c:54:1: error: destructor priorities are not supported
   54 | release_registered_frames (void) __attribute__ ((destructor (110)));
      | ^~~~~~~~~~~~~~~~~~~~~~~~~

This is already checked for in libgcc/configure, and the situation
handled in libgcc/config/i386/cpuinfo.c.  The following patch unbroke
bootstrap on both affected targets and I saw no apparent regressions.
However, I cannot tell if the destructor priority is actually required
for correctness.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University