Support Sun as visibility syntax

[Rainer Orth]

Eric Botcazou <ebotcazou@adacore.com> writes:

>> I wouldn't call this conventional wisdom, but just another case of
>> inconsistencies between ports.  E.g. i?86-*-solaris2* uses tm_defines
>> for TARGET_GNU_LD=1 and TARGET_BI_ARCH=1, m68k*-*-openbsd* for
>> OBSD_OLD_GAS, mips-sgi-irix[56]* for IRIX_USING_GNU_LD, and many more.
>> I'm just trying to get away from the huge number of single-line headers
>> which can just as well be handled by tm_defines.
>
> Do whatever you like with other macros but, again, not for USE_GAS.  There is 
> at least one thing consistent in config.gcc, it's that no ports define it.
> Since you aren't maintainer of all the ports, defining it for Solaris will 
> introduce an inconsistency where there is none.

If your happyness depends on it, I'll do so.  I still believe that
intra-port consistency is important here and will probably file a PR for
replacing single-line headers with tm_defines.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University