nemanjai added a comment.
This patch appears to be perfectly fine. However, it triggers a large number of
warnings. Namely, there's a large number of `warning: ISO C forbids an empty
translation unit [-Wpedantic]` warnings produced.
The reason is that all the code in the file is wrapped with an `if !_ARCH_PPC`
macro. I assume that we do not want `compiler_rt` to expose builtins that
assume an 80-bit `long double` (which is the behaviour we get now). So it seems
to me that files that define such builtins should simply be removed from the
`powerpc64_SOURCES` and they should `#error` on PPC.
Also, I'm getting lots of warnings from `compiler-rt/lib/builtins/atomic.c`
such as `warning: implicit declaration of function '__c11_atomic_fetch_or'
[-Wimplicit-function-declaration]`. It would appear that the `__c11_atomic_*`
family of builtins isn't exposed by the build compiler (and should presumably
be declared in a header if file is being built with a compiler that doesn't
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