mkspecs/features/qmake_use.prf


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suffix =
for(ever) {
    QMAKE_USE$${suffix} = $$unique(QMAKE_USE$${suffix})
    for (name, QMAKE_USE$${suffix}) {
        nu = $$upper($$name)
        debug: \
            libs = $$eval(QMAKE_LIBS_$${nu}_DEBUG)
        else: \
            libs = $$eval(QMAKE_LIBS_$${nu}_RELEASE)
        libs += $$eval(QMAKE_LIBS_$$nu)
        cflags = $$eval(QMAKE_CFLAGS_$${nu})

        isEmpty(libs):isEmpty(cflags): \
            error("Library '$$name' is not defined.")

        LIBS$${suffix} += $$libs
        QMAKE_CFLAGS += $$cflags
        QMAKE_CXXFLAGS += $$cflags
    }
    !isEmpty(suffix): break()
    suffix = "_PRIVATE"
}