ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/5] COPY ../../libcxxabi/include/__cxxabi_config.h include/c++/v1/__cxxabi_config.h
[2/5] COPY ../../libcxxabi/include/cxxabi.h include/c++/v1/cxxabi.h
[3/5] ACTION //libcxx/include:copy_headers(//llvm/utils/gn/build/toolchain:host)
[4/5] CXX obj/llvm/tools/llvm-reduce/llvm-reduce.ReducerWorkItem.o
[5/5] LINK ./bin/llvm-reduce