[CMake] problem on windows with $ENV{something}

[Alexander Neundorf]

Hi, 
 
it seems there's an issue with using $ENV{something} under windows, as 
can be read here and followups: 
http://mail.kde.org/pipermail/kde-buildsystem/2006-February/001083.html 
 
The problems is that if the environment variable contains backslahes (and 
maybe spaces), it breaks the dependency scanning of cmake, i.e. 
dependencies are not scanned. This has been reported for nmake. 
 
A workaround is to replace all backslahes to forward slashes using 
string(regex replace ...) 
 
Is this a bug or a feature ? 
 
Bye 
Alex 
 

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