Define __sparcv8 in 64-bit-default Solaris/SPARC gcc with -m32

[Eric Botcazou]

> Eric, could you have another look if I'm missing something?

Note that this OPTION_DEFAULT_SPECS code is duplicated in linux64.h.

There is this comment:

   In the SPARC_BI_ARCH compiler we cannot pass %{!mcpu=*:-mcpu=%(VALUE)}
   here, otherwise say -mcpu=v7 would be passed even when -m64.
   CC1_SPEC above takes care of this instead.

Why does CC1_SPEC not work apparently?

> Otherwise, I'm going to commit the patch (it's necessary to enable
> SANITIZER_CAN_FAST_UNWIND on Solaris/SPARC and make use of
> libsanitizer/sanitizer_common/sanitizer_stacktrace_sparc.cc).

No, it will not be necessary, I have ported the implementation to 64-bit.

-- 
Eric Botcazou