ninja: Entering directory `out/gn'
[1/403] ACTION //clang/tools/driver:clangxx(//llvm/utils/gn/build/toolchain:unix)
[2/403] ACTION //clang/tools/driver:clang-cl(//llvm/utils/gn/build/toolchain:unix)
[3/403] ACTION //clang/tools/driver:clang-cpp(//llvm/utils/gn/build/toolchain:unix)
[4/403] ACTION //libcxx/include:write_config_site(//llvm/utils/gn/build/toolchain:unix)
FAILED: include/c++/v1/__config_site 
python3 ../../llvm/utils/gn/build/write_cmake_config.py -o include/c++/v1/__config_site ../../libcxx/include/__config_site.in _LIBCPP_ABI_FORCE_ITANIUM= _LIBCPP_ABI_FORCE_MICROSOFT= _LIBCPP_ABI_VERSION=1 _LIBCPP_ASSERTION_SEMANTIC_DEFAULT=_LIBCPP_ASSERTION_SEMANTIC_HARDENING_DEPENDENT _LIBCPP_EXTRA_SITE_DEFINES= _LIBCPP_HAS_FILESYSTEM=1 _LIBCPP_HAS_THREADS=1 _LIBCPP_HAS_MONOTONIC_CLOCK=1 _LIBCPP_HAS_MUSL_LIBC= _LIBCPP_HAS_THREAD_API_PTHREAD= _LIBCPP_HAS_THREAD_API_EXTERNAL= _LIBCPP_HAS_THREAD_API_WIN32= _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS= _LIBCPP_HAS_VENDOR_AVAILABILITY_ANNOTATIONS= _LIBCPP_NO_VCRUNTIME= _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION= _LIBCPP_HAS_RANDOM_DEVICE=1 _LIBCPP_HAS_LOCALIZATION=1 _LIBCPP_HAS_UNICODE=1 _LIBCPP_HAS_WIDE_CHARACTERS=1 _LIBCPP_HAS_TERMINAL=1 _LIBCPP_INSTRUMENTED_WITH_ASAN= _LIBCPP_ABI_DEFINES= _LIBCPP_HARDENING_MODE_DEFAULT=_LIBCPP_HARDENING_MODE_NONE _LIBCPP_LIBC_PICOLIBC= _LIBCPP_LIBC_NEWLIB= _LIBCPP_PSTL_BACKEND_LIBDISPATCH= _LIBCPP_PSTL_BACKEND_SERIAL= _LIBCPP_PSTL_BACKEND_STD_THREAD=1 _LIBCPP_ABI_NAMESPACE=__1 _LIBCPP_HAS_TIME_ZONE_DATABASE=1
Traceback (most recent call last):
  File "/usr/local/google/home/thakis/src/llvm-project/out/gn/../../llvm/utils/gn/build/write_cmake_config.py", line 122, in <module>
    sys.exit(main())
             ~~~~^^
  File "/usr/local/google/home/thakis/src/llvm-project/out/gn/../../llvm/utils/gn/build/write_cmake_config.py", line 75, in main
    if values[var] == "0":
       ~~~~~~^^^^^
KeyError: '_LIBCPP_LIBC_LLVM_LIBC'
[5/403] ACTION //compiler-rt/test/asan:lit_site_cfg(//llvm/utils/gn/build/toolchain:stage2_unix)
[6/403] ACTION //llvm/include/llvm/Config:TargetExegesis.def(//llvm/utils/gn/build/toolchain:stage2_unix)
[7/403] ACTION //llvm/include/llvm/Config:Targets(//llvm/utils/gn/build/toolchain:stage2_unix)
[8/403] ACTION //compiler-rt/test:lit_common_configured(//llvm/utils/gn/build/toolchain:stage2_unix)
[9/403] ACTION //compiler-rt/test/builtins:builtins_mode_cfg(//llvm/utils/gn/build/toolchain:stage2_unix)
[10/403] ACTION //llvm/include/llvm/Config:TargetMCAs.def(//llvm/utils/gn/build/toolchain:stage2_unix)
[11/403] ACTION //compiler-rt/test/hwasan:lit_site_cfg(//llvm/utils/gn/build/toolchain:stage2_unix)
[12/403] ACTION //compiler-rt/test/lsan:asan_mode_cfg(//llvm/utils/gn/build/toolchain:stage2_unix)
[13/403] ACTION //llvm/include/llvm/Config:AsmPrinters.def(//llvm/utils/gn/build/toolchain:stage2_unix)
[14/403] ACTION //llvm/include/llvm/Config:AsmParsers.def(//llvm/utils/gn/build/toolchain:stage2_unix)
[15/403] ACTION //llvm/include/llvm/Config:Targets.def(//llvm/utils/gn/build/toolchain:stage2_unix)
[16/403] ACTION //llvm/include/llvm/Config:Disassemblers.def(//llvm/utils/gn/build/toolchain:stage2_unix)
[17/403] ACTION //llvm/include/llvm/Support:write_extension_def(//llvm/utils/gn/build/toolchain:stage2_unix)
[18/403] ACTION //llvm/include/llvm/Config:llvm-config(//llvm/utils/gn/build/toolchain:stage2_unix)
[19/358] ACTION //llvm/include/llvm/Support:write_vcsrevision(//llvm/utils/gn/build/toolchain:stage2_unix)
[20/358] ACTION //llvm/include/llvm/Config:abi-breaking(//llvm/utils/gn/build/toolchain:stage2_unix)
[21/222] LINK obj/clang/unittests/libclang/CrashTests/libclangCrashTests
[22/222] LINK obj/clang/unittests/libclang/libclangTests
[23/222] ACTION //compiler-rt/lib/ubsan:version_script(//llvm/utils/gn/build/toolchain:stage2_unix)
[24/222] ACTION //compiler-rt/lib/hwasan:version_script(//llvm/utils/gn/build/toolchain:stage2_unix)
[25/222] LINK ./bin/c-index-test
[26/222] LINK ./bin/lldb
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.