Wrong detection of intsafe.h at MinGW (with GCC 4.8.1)#34
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It was reported in https://github.com/modelica/ModelicaStandardLibrary/issues/3556 that the following lines https://github.com/nemequ/portable-snippets/blob/f596f8b0a4b8a6ea1166c2361a5cb7e6f802c5ea/safe-math/safe-math.h#L22-L28 are not protable enough for MinGW with GCC 4.8.1 (not exclusively to that version). The issue probably is, that old GCC 4.8.1 has no `__has_include` why it then sets `PSNIP_SAFE_HAVE_INTSAFE_H` in the else branch since MinGW defines `_WIN32`. AFAIK, there is no intsafe.h on MinGW yet.
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