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Subject:	Re: Why is __unix__ defined, and not __WINDOWS__ ?
To:	cygwin AT cygwin DOT com
References:	<5fbb6229-da17-c056-19b9-9819c684a8ad AT agner DOT org>
From:	=?UTF-8?Q?Hans-Bernhard_Br=c3=b6ker?= <HBBroeker AT t-online DOT de>
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Date:	Sun, 12 May 2019 21:53:48 +0200
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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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