Remove obsolete Tru64 UNIX V5.1B support

[Rainer Orth]

Douglas Rupp <rupp@gnat.com> writes:

> On 3/5/2012 9:28 AM, Richard Henderson wrote:
>> On 03/05/2012 09:14 AM, Rainer Orth wrote:
>>> * In the alpha backend, there are a couple of cases that might be
>>>    osf-specific, but I cannot tell for certain:
>>>
>>>    macro				  osf5.h        alpha.h
>>>
>>>    TARGET_AS_CAN_SUBTRACT_LABELS	  1		TARGET_GAS
>>>
>>>    I cannot tell if !TARGET_GAS configurations exist, especially Alpha VMS.
>>>    Also, in alpha.h there are some references to mips-tfile, which is
>>>    gone with osf.  If there are no non-gas configrations remaining, that
>>>    stuff can go, too.
>> Given that GAS supports VMS, I suspect that all targets are now GAS.
>> I'll let the adacore folks answer that for certain howeverl.
>>
> All Alpha/VMS targets use GAS.

Fine.  Given that the BSDs have no option but to use gas (and all of
them include MASK_GAS in config.gcc (target_cpu_default), the
!TARGET_GAS support can go.

I'll either do this in a followup patch or leave it to the alpha
maintainers.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University