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Hello, Our current handling of -fno-math-errno (and this -ffast-math) in Clang is broken on systems for which libm functions do actually set errno. This is because, when -fno-math-errno is in effect, libm functions like sqrt, sin, cos, etc. are marked as readnone. As a result, these calls can be reordered with respect to other calls that set errno, and can clobber errno before it can be read. For