[CMake] Setting new file extensions

[Filipe Sousa]

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I'm trying to add a new file extension through
CMAKE_CXX_SOURCE_FILE_EXTENSIONS but it doesn't work because the global
generator reads the variable before I had a chance to set the variable

SET(CMAKE_CXX_SOURCE_FILE_EXTENSIONS
  ${CMAKE_CXX_SOURCE_FILE_EXTENSIONS} moc)

Is there another way to do this?

- --
Filipe Sousa
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