Re: [PATCH v1 4/5] powerpc: Remove cpu-as-y completely

[Christophe Leroy]

Le 20/02/2023 à 07:00, Michael Ellerman a écrit :
> Christophe Leroy <christophe.leroy@xxxxxxxxxx> writes:
>> cpu-as-y is there to force assembler building options.
>> But there is no need for that. Gcc is passed the necessary
>> options and it automatically pass the appropriate option to
>> GAS.
>>
>> GCC is given -maltivec when relevant, so no need
>> for -Wa,-maltivec in addition
>>
>> And -Wa,-many is wrong as it will hide innapropriate
>> instructions. Better to detect them and handle them on a
>> case by case basis.
>> -Wa,-many was added by commit 960e30029863 ("powerpc/Makefile:
>> Fix PPC_BOOK3S_64 ASFLAGS") in order to fix an issue with
>> clang and the passed -Wa,-mpower4 option. But we have now
>> removed it expecting the compiler to automatically pass the
>> proper options and instructions based on -mcpu=power4
> 
> I wanted to apply this one, but it caused a lot of breakage for big
> endian Book3S-64 builds - where we build for power4 but have lots of
> code that uses >= power5 instructions.
> 
> I'll try and get those all fixed and pick this up for the next merge
> window.
> 

ping ?