qt-everywhere-src-5.15.1/qtbase/mkspecs/features/unix/bsymbolic_functions.prf

dll {
    QMAKE_LFLAGS_SHLIB += $$QMAKE_LFLAGS_BSYMBOLIC_FUNC

    !isEmpty(QMAKE_DYNAMIC_LIST_FILE):QMAKE_LFLAGS_SHLIB += $$QMAKE_LFLAGS_DYNAMIC_LIST$$QMAKE_DYNAMIC_LIST_FILE
}