[powerpc:next-test 54/220] arch/powerpc/kernel/vdso32/vgettimeofday.c:13:5: warning: no previous prototype for function '__c_kernel_clock_gettime64'

[Nick Desaulniers]

On Mon, Dec 7, 2020 at 4:23 AM Michael Ellerman <mpe at ellerman.id.au> wrote:
>
> So is clang defining __powerpc64__ even for 32-bit code?
>
> And the answer appears to be yes:
>
>   $ clang --version
>   Ubuntu clang version 11.0.0-2
>   Target: powerpc64le-unknown-linux-gnu
>
>   $ clang -m32 -dM -E - < /dev/null | grep powerpc
>   #define __powerpc64__ 1
>   #define __powerpc__ 1
>
> Compare to gcc:
>
>   $ gcc --version
>   gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0
>
>   $ gcc -m32 -dM -E - < /dev/null | grep powerpc
>   #define __powerpc__ 1
>   #define powerpc 1
>   #define __powerpc 1
>
>
> Which is fairly problematic, because we use the presence/absence of
> __powerpc64__ to determine if we're building 64-bit/32-bit code in
> several places.
>
> Not sure what the best approach for fixing that is.

Thanks for the triage; we should fix our preprocessor:
https://bugs.llvm.org/show_bug.cgi?id=48427
-- 
Thanks,
~Nick Desaulniers