Hi, I'm reporting this against MinGW 8 on Debian Testing. The math.h header doesn't define MATH_ERRNO and MATH_ERREXCEPT, which are convenience macros always to be defined as 1 or 2 respectively.
math_errhandling should be an identifier for an integer—not necessarily a macro —that is one of the constants, or the bitwise or of both, according to how errors are raised for math functions. If Windows is non-conforming and sets neither errno nor raises floating-point exceptions as required for math functions, then math_errhandling should be 0; this at least matches up with how GCC behaves in __FAST_MATH__ mode, and lets programs Do The Right Thing.
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