Why is __unix__ defined, and not __WINDOWS__ ?

[Lee]

On 5/12/19, Hans-Bernhard Bröker wrote:
> 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.

Or you can use a cross-compiler to create a 'native' windows
executable that doesn't require any of the cygwin dlls.

$ echo | gcc -dM -E -xc - | grep '#define _WIN32 '

$ echo | i686-w64-mingw32-gcc -dM -E -xc - | grep '#define _WIN32 '
#define _WIN32 1

Lee

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