[CMake] howto "compile always"

[Alexander Neundorf]

Hi, 
 
how can I enforce that a special source file is compiled always new ? 
I tried  
ADD_CUSTOM_TARGET(recompile_always ALL touch sourcefile.cpp) 
 
and this kindof works, but it touches sourcefile.cpp *after* my executable
has been 
built. Is there a way to have it touched before everything else ? 
 
Bye 
Alex 
 

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