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To:	cygwin AT cygwin DOT com
From:	Agner Fog <agner AT agner DOT org>
Subject:	Why is __unix__ defined, and not __WINDOWS__ ?
Message-ID:	<5fbb6229-da17-c056-19b9-9819c684a8ad@agner.org>
Date:	Sun, 12 May 2019 20:22:36 +0200
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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?

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.




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