ninja: Entering directory `out/gn'
[1/3] COPY ../../libcxx/include/__cxx03/sstream include/c++/v1/__cxx03/sstream
[2/3] COPY ../../libcxx/include/__cxx03/__atomic/atomic.h include/c++/v1/__cxx03/__atomic/atomic.h
[3/3] COPY ../../libcxx/include/__cxx03/__atomic/atomic_base.h include/c++/v1/__cxx03/__atomic/atomic_base.h