ninja: Entering directory `out/gn'
[1/5] COPY ../../libcxx/include/__mutex/mutex.h include/c++/v1/__mutex/mutex.h
[2/5] COPY ../../libcxx/include/__mutex/lock_guard.h include/c++/v1/__mutex/lock_guard.h
[3/5] COPY ../../libcxx/include/shared_mutex include/c++/v1/shared_mutex
[4/5] COPY ../../libcxx/include/__config include/c++/v1/__config
[5/5] COPY ../../libcxx/include/mutex include/c++/v1/mutex