`man isinf`
>In glibc 2.01 and earlier, isinf() returns a nonzero value
> (actually: 1) if x is positive infinity or negative infinity.
> (This is all that C99 requires.)"

whereas: C: return non-zero values for infinite values
 (be it +Infinity or -Infinity)

Can we have similar behaviour for Mingw-w64?
I recompiled libreplot for MS Windows and got a runtime problem due to
code relying specifically on behaviour of glibc > 2.01.

current math.h: `#define isinf(x) (fpclassify(x) == FP_INFINITE)`

-- 
Kuldeep Singh Dhaka

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