# move Objective C and C++ files from SOURCES to OBJECTIVE_SOURCES

for(source, SOURCES) {
    contains(source,.*\\.m$) {
        warning(Objective-C source \'$$source\' found in SOURCES but should be in OBJECTIVE_SOURCES)
        SOURCES -= $$source
        OBJECTIVE_SOURCES += $$source
    } else {
        contains(source,.*\\.mm$) {
            warning(Objective-C++ source \'$$source\' found in SOURCES but should be in OBJECTIVE_SOURCES)
            SOURCES -= $$source
            OBJECTIVE_SOURCES += $$source
 	}
    }
}

# move C and C++ files from OBJECTIVE_SOURCES to SOURCES

for(source, OBJECTIVE_SOURCES) {
    contains(source,.*\\.c$) {
        warning(C source \'$$source\' found in SOURCES but should be in SOURCES)
        OBJECTIVE_SOURCES -= $$source
        SOURCES += $$source
    } else {
      	contains(source,.*\\.cc$) {
            warning(C++ source \'$$source\' found in SOURCES but should be in SOURCES)
            OBJECTIVE_SOURCES -= $$source
            SOURCES += $$source
        } else {
    	    contains(source,.*\\.cpp$) {
	        warning(C++ source \'$$source\' found in SOURCES but should be in SOURCES)
		OBJECTIVE_SOURCES -= $$source
		SOURCES += $$source
            }
        }
    }
}

# split Objective C and C++ sources into their own variables

for(source, OBJECTIVE_SOURCES) {
    contains(source,.*\\.mm$) {
        OBJECTIVE_CXX_SOURCES += $$source
    } else {
        contains(source,.*\\.m$) {
            OBJECTIVE_C_SOURCES += $$source
        } else {
            warning(Source \'$$source\' was found in OBJECTIVE_SOURCES but its file extension is not a typical objective C (\'.m\') or C++ (\'.mm\') extension; assuming Objective C.)
            OBJECTIVE_C_SOURCES += $$source
	}
    }
}