Clang does not support the -fprofile-correction PGO flag #59
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See here https://github.com/llvm-mirror/clang/blob/master/test/Driver/clang_f_opts.c#L375
Is the case as of llvm 6 and before. It would be my belief that clang does this automatically.
zstd
is a package that contains a real world example of this warning.