1 CONFIG(release, debug|release) {

     2     QMAKE_CFLAGS *= $$QMAKE_CFLAGS_LTCG

     3     QMAKE_CXXFLAGS *= $$QMAKE_CXXFLAGS_LTCG

     4     QMAKE_LFLAGS *= $$QMAKE_LFLAGS_LTCG

     5 }