qt5base-lts/mkspecs/features/win32/windows.prf

CONFIG -= console
contains(TEMPLATE, ".*app"){
    QMAKE_LFLAGS += \
        $$replace(QMAKE_LFLAGS_WINDOWS, @QMAKE_SUBSYSTEM_SUFFIX@, $$QMAKE_SUBSYSTEM_SUFFIX) \
        $$QMAKE_LFLAGS_EXE
    mingw:DEFINES += QT_NEEDS_QMAIN

    qt:for(entryLib, $$list($$unique(QMAKE_LIBS_QT_ENTRY))) {
        isEqual(entryLib, -lqtmain): {
            !contains(QMAKE_DEFAULT_LIBDIRS, $$QT.core.libs): \
                QMAKE_LIBS += -L$$QT.core.libs
            CONFIG(debug, debug|release): QMAKE_LIBS += $${entryLib}$${QT_LIBINFIX}d
            else: QMAKE_LIBS += $${entryLib}$${QT_LIBINFIX}
        } else {
            QMAKE_LIBS += $${entryLib}
        }
    }
}