ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/3] COPY ../../libcxx/include/map include/c++/v1/map
[2/3] COPY ../../libcxx/include/__tree include/c++/v1/__tree
[3/3] COPY ../../libcxx/include/set include/c++/v1/set