ninja: Entering directory `out/gn'
[1/3] COPY ../../libcxx/include/__flat_map/flat_map.h include/c++/v1/__flat_map/flat_map.h
[2/3] COPY ../../libcxx/include/__flat_map/flat_multimap.h include/c++/v1/__flat_map/flat_multimap.h
[3/3] COPY ../../libcxx/include/__flat_set/flat_set.h include/c++/v1/__flat_set/flat_set.h