CMakeMacroCreateFinalFile

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Sometimes it's faster (and the compiler might be able to optimize better) to include all source files of a project into one source file and compile only this one file instead of all files each one by one. This can be done with the macro CREATE_FINAL_FILE().

Usage is like this:

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SET(app_SRCS main.cpp app.cpp bar.c foo.c)
OPTION(ENABLE_FINAL "Enable final all-in-one compilation.")
IF(ENABLE_FINAL)
   CREATE_FINAL_FILE(_final.cpp ${_app_SRCS} )
   ADD_EXECUTABLE(foo _final.cpp)
ELSE(ENABLE_FINAL)
   ADD_EXECUTABLE(foo ${app_SRCS} )
ENDIF(ENABLE_FINAL)

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This example creates an executable named "foo" from the sources main.cpp, app.cpp, bar.c and foo.c. If the option "ENABLE_FINAL" is enabled, these for files will be included in the file "_final.cpp" and only this will be compiled. Otherwise the four source files are compiled one by one as you know it. And here comes the macro:

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MACRO(CREATE_FINAL_FILE _filename)
   FILE(WRITE ${_filename} "//autogenerated file\n")
   FOREACH (_current_FILE ${ARGN})
      FILE(APPEND ${_filename} "#include \"${_current_FILE}\"\n")
   ENDFOREACH (_current_FILE)
ENDMACRO(CREATE_FINAL_FILE _filename)

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