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Food for thought: If you have a codebase which can't use -fno-math-errno, because it relies on errno values from math functions, it may be a more effective long-term strategy to work on modernizing your codebase, eliminating the dependencies on errno, rather than going through the trouble of adding even more complexity to compilers to keep errno support limping along. Of course, whether this

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