Re: [Mingw-cross-env-list] Qt built with mingw does not define Q_WS_WIN

[Mark Brand]

> After Qt was successfully built, I tried to build my Qt app with it.  
> I have code that needs to work different on Windows, and I check it with:
>
>   #ifndef Q_WS_WIN
>   // Unix-only code...
>   #endif
>
> However, the Q_WS_WIN macro is not defined and compilation fails.  I'm 
> trying to build the project with:
>
>   i686-pc-mingw32-qmake
>   make
>
> This results in the following.  Note that the definition of "memicmp" 
> is what Q_WS_WIN is needed for.

It might make sense to check for MinGW since that that is what does or 
does not provide memicmp. It's not really specific to Qt.

#ifdef __MINGW32__

This raises the interesting question of whether Q_WS_WIN should be 
defined in Qt in mingw-cross-env. We have not missed it yet. The Qt 
documentation says about it only "Defined on Windows."  What "on 
Windows" means is open to some interpretation, particularly when cross 
building. I don't know what the answer is.

There is similar ambiguity in the meaning of qmake's "-win32/-unix" 
options that requires some strange workarounds for cross-building Qt you 
can see in src/qt.mk.

-Mark