qt5base-lts/mkspecs/features/unix/no_direct_extern_access.prf

clang {
    QMAKE_CFLAGS += -fno-direct-access-external-data
    QMAKE_CXXFLAGS += -fno-direct-access-external-data
} else {
    QMAKE_CFLAGS += -mno-direct-extern-access
    QMAKE_CXXFLAGS += -mno-direct-extern-access
}