On latest clang trunk, the code

const char *text = ("Content of this directory moved to " +
							                    xdg_data_home + "/openspades")
							                     .c_str();

in https://github.com/yvt/openspades/blob/master/Sources/Gui/Main.cpp#L428

causes the warning

warning: object backing the pointer will be destroyed at the end of the full-expression [-Wdan