ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/404] COPY ../../libcxxabi/include/cxxabi.h include/c++/v1/cxxabi.h
[2/404] COPY ../../libcxxabi/include/__cxxabi_config.h include/c++/v1/__cxxabi_config.h
[3/404] CXX obj/clang-tools-extra/clang-doc/markdown/markdown.Markdown.o
FAILED: obj/clang-tools-extra/clang-doc/markdown/markdown.Markdown.o 
../../../chrome/src/third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF obj/clang-tools-extra/clang-doc/markdown/markdown.Markdown.o.d -o obj/clang-tools-extra/clang-doc/markdown/markdown.Markdown.o -c ../../clang-tools-extra/clang-doc/markdown/Markdown.cpp  -I../../llvm/include -Igen/llvm/include -I../../clang/include -Igen/clang/include -O3 -fdiagnostics-color -Wall -Wextra -Wno-unused-parameter -Wdelete-non-virtual-dtor -Wstring-conversion -no-canonical-prefixes -Werror=date-time -fdebug-compilation-dir=. --sysroot=../../sysroot -Wpoison-system-directories -fPIC -Wcovered-switch-default -fno-strict-aliasing -std=c++17 -fvisibility-inlines-hidden -fno-exceptions -fno-rtti
clang++: error: no such file or directory: '../../clang-tools-extra/clang-doc/markdown/Markdown.cpp'
clang++: error: no input files
[4/404] AR lib/libclangSema.a
[5/404] ACTION //libcxx/include:copy_headers(//llvm/utils/gn/build/toolchain:unix)
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.