ninja: Entering directory `out/gn'
[1/4] COPY ../../libcxx/include/__tree include/c++/v1/__tree
[2/4] COPY ../../libcxx/include/__cxx03/vector include/c++/v1/__cxx03/vector
[3/4] CXX stage2_unix/obj/libcxx/src/experimental/cxx_experimental.time_zone.o
[4/4] AR lib/libc++experimental.a