Re: ppc64le: SLOF failed to rebuild: error: unrecognized argument in option '-mtune=generic'

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* Richard W. M. Jones:

> On Fri, Jan 21, 2022 at 10:43:16AM +0100, Florian Weimer wrote:
>> * Tom Hughes via devel:
>> 
>> > On 21/01/2022 09:08, Richard W.M. Jones wrote:
>> >
>> >> https://koji.fedoraproject.org/koji/taskinfo?taskID=81468000
>> >> This seems like a compiler bug or a bug in the standard switches
>> >> being
>> >> added by RPM on ppc64le.  SLOF itself does not appear to add or adjust
>> >> the -mtune flag.
>> >
>> > That's not even a ppc64le build, it's an x86_64 build using a cross
>> > compiler from the gcc-powerpc64-linux-gnu package - that is actually
>> > still 11.2 and hasn't been upgraded to 12 yet.
>> >
>> > I don't know where -mtune=generic comes from but a normal ppc64le
>> > build uses -mcpu=power8 -mtune=power8 as it's defaults.
>> 
>> It's probably a result of implicit %set_build_flags.
>> 
>> %undefine _auto_set_build_flags
>> 
>> should fix it.
>
> Yes that works!
>
> But I don't quite understand what "implicit build flags" means here.
> It's not using %configure.

Rawhide was changed to call %set_build_flags automatically:

  %set_build_flags for %build, %check, and %install phases
  <https://fedoraproject.org/wiki/Changes/SetBuildFlagsBuildCheck>

Thanks,
Florian
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