RFC: powerpc-multilibs: remove -mcpu=601 and -Dmpc8260 multilibs

[Till Straumann]

I don't know who made that (IMHO a bit unfortunate) change.
The BSP should IMO use -D__ppc_generic -msoft-float.

All BSPs that use a classic PPC should get away with
-D__ppc_generic with or w/o -msoft-float, depending
on whether the CPU has or doesn't have a FPU.
If the CPU has AltiVec then -maltivec, -mabi=altivec
should be added. I.e., for classic PPCs only three
multilibs are really needed:

generic PPC instructions with FPU
generic PPC instructions with FPU and ALtiVec
generic PPC instructions w/o FPU and w/o AltiVec

For booke-type CPUs another (or multiple other) multilib(s)
(than the generic PPC one) is/are necessary.

T.


On 02/21/2011 06:24 PM, Joel Sherrill wrote:
> On 02/21/2011 11:21 AM, Till Straumann wrote:
>> FYI: users of the mvme2100 BSP should make sure
>> the -Dmpc8260 multilib is no longer needed.
> The mvme2100 is an mpc8240. It uses these flags:
>
> CPU_CFLAGS = -mcpu=603e -Dppc603e
>
> So it should not be impacted.
>
> --joel
>> T.
>>
>>
>> On 02/21/2011 05:24 PM, Ralf Corsepius wrote:
>>> On 02/18/2011 03:13 PM, Ralf Corsepius wrote:
>>>> Hi,
>>>>
>>>> When looking into Sebastian's proposal to change the powerpc
>>>> multilibs[1], I believe to have identified the
>>>>
>>>> * -mcpu=601 [2]
>>>> and
>>>> * -Dmpc8260 [3]
>>>>
>>>> multilibs as unused.
>>>>
>>>> Am I missing something or does this apply? The latter would mean these
>>>> multilibs can be removed.
>>> I removed these 2 multilibs in rtems4.11's latest toolchain update.
>>>
>>> Please speak up ASAP, should I have broken something.
>>>
>>> Shouldn't I hear something by the end of this week, I'll likely also
>>> remove these multilibs from the rtems4.10 toolchains, as well.
>>>
>>> Ralf
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>