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SubjectRe: objtool warning "uses BP as a scratch register" with clang-9
> > $ clang-9 -c  crc32.i  -O2   ; objtool check  crc32.o
> > crc32.o: warning: objtool: fn1 uses BP as a scratch register

Yes, I see it too. https://godbolt.org/z/N56HW1

> Do you still see this warning with -fno-omit-frame-pointer (assuming
> clang has that option)?

Using this makes the warning go away. Running objtool with --no-fp
also gets rid of it.

I.H.

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