BUG: Fix order of Windows OS detection macros. #24813
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* BUG: Fix order of Windows OS detection macros.
- The order should be `__MINGW32__/__MINGW64__`, then `_WIN64`,
and then `_WIN32`.
64 bit MinGW compilers define `_MINGW32__`, `__MINGW64__`, `_WIN32`, and `_WIN64`.
32 bit MinGW compilers define `__MINGW32__`, and `_WIN32`.
64 bit MSVC compilation defines `_WIN32` and `_WIN64`.
32 bit MSVC compilation defines `_WIN32`.
- Fixes numpy#24761.
* Adjust the structure slightly and add comments.
- This is better than just relying on the order of evaluation in the whole
chain. Once Windows is detected (`_WIN32`), handle the possible known
Windows environments separately.
* Remove check for non-standard macros.
- `WIN32`, `__WIN32__`, `WIN64`, `__WIN64__` are not standard macros defined
by Window compilers.
It should be enough to check for `_WIN32` and `_WIN64` alone.
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Backport of #24762.
BUG: Fix order of Windows OS detection macros.
The order should be
__MINGW32__/__MINGW64__, then_WIN64, and then_WIN32.64 bit MinGW compilers define
_MINGW32__,__MINGW64__,_WIN32, and_WIN64. 32 bit MinGW compilers define__MINGW32__, and_WIN32. 64 bit MSVC compilation defines_WIN32and_WIN64. 32 bit MSVC compilation defines_WIN32.Fixes BUG: Order of OS detection macros (for Windows) seems faulty #24761.
Adjust the structure slightly and add comments.
_WIN32), handle the possible known Windows environments separately.Remove check for non-standard macros.
WIN32,__WIN32__,WIN64,__WIN64__are not standard macros defined by Window compilers.It should be enough to check for
_WIN32and_WIN64alone.