RFA: fix gcc.dg/torture/builtin-noret-2.c for sh-elf

[Zack Weinberg]

Joern Rennecke <joern.rennecke@superh.com> writes:

> Zack Weinberg wrote:
>> 
>> Joern Rennecke <joern.rennecke@superh.com> writes:
>> 
>> >
>> >       * gcc.dg/torture/builtin-noret-2.c (_exit): Make weak.
>> 
>> #pragma weak is not recognized on all targets where weak symbols are
>> meaningful.  I think you can use attribute weak instead, but please
>> check that that won't cause an error on a target without weak symbols.
>
> It causes an extra warning on sh-coff:	
[snip]

Hrm.  The #pragma is recognized if HANDLE_SYSV_PRAGMA, one of the
ASM_WEAKEN_* macros, and SUPPORTS_WEAK are all set.  This strikes me
as silly.  We should recognize #pragma weak whenever weak symbols are
meaningful.  Would you be willing to prepare a patch to that effect?

Another note on your original patch: whatever ends up being done, I
think _Exit needs the same treatment.

zw