Why is __unix__ defined, and not __WINDOWS__ ?

[Hans-Bernhard Bröker]

Am 12.05.2019 um 20:22 schrieb Agner Fog:

> I have noticed that the gcc and clang compilers have defined the
> preprocessing macro __unix__, but not __WINDOWS__, _WIN32, or _WIN64
> when compiling a windows executable.
> 
> Why is this?

Because it's correct that way.  Cygwin runs on Windows, but it _is_ not
Windows.

> A C/C++ program will check for these macros if it wants to know which
> operating system you are compiling for, and this will give the wrong
> result.

No.  It gives the correct result.

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