[CMake] Creating custom file before building/compiling with cmake

["Roman Wüger" <norulez@me.com> at mac.com]

Hello,

i need to create a file called "ApplicationVersion.xml" before the main source file (main.cpp) would be compiled.
The file should contain some application details and the current Date/Time and SVN Revision.

How can I create such file before the source file are compiled?
How can I get the current Date/Time and the SVN Revision?

Thanks in advance

Best Regards
NoRulez
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