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This doesn't actually have any effect unless you also change the predefined value of __cplusplus, as it's currently 201703L. But if somebody does want to do that, the new headers will get processed now. libstdc++-v3/ChangeLog: * doc/doxygen/user.cfg.in (INPUT): Add <latch> and <semaphore>.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.