ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/6850] COPY ../../libcxxabi/include/__cxxabi_config.h include/c++/v1/__cxxabi_config.h
[2/6850] COPY ../../libcxxabi/include/cxxabi.h include/c++/v1/cxxabi.h
[3/6850] ACTION //libcxx/include:write_modulemap(//llvm/utils/gn/build/toolchain:unix)
[4/6850] ACTION //clang-tools-extra/clangd/test:lit_site_cfg(//llvm/utils/gn/build/toolchain:unix)
FAILED: gen/clang-tools-extra/clangd/test/lit.site.cfg.py 
python3 ../../llvm/utils/gn/build/write_cmake_config.py -o gen/clang-tools-extra/clangd/test/lit.site.cfg.py ../../clang-tools-extra/clangd/test/lit.site.cfg.py.in LIT_SITE_CFG_IN_HEADER=\#\#\ Autogenerated\ from\ //clang-tools-extra/clangd/test/lit.site.cfg.py.in,\ do\ not\ edit LLVM_LIBS_DIR= SHLIBDIR=/usr/local/google/home/thakis/src/llvm-project/out/gn/lib CMAKE_CURRENT_BINARY_DIR=/usr/local/google/home/thakis/src/llvm-project/out/gn/obj/clang-tools-extra/clangd/test CMAKE_CURRENT_SOURCE_DIR=/usr/local/google/home/thakis/src/llvm-project/clang-tools-extra/clangd/test CURRENT_TOOLS_DIR= CLANGD_BUILD_DEXP=1 CLANGD_ENABLE_REMOTE=0 CLANGD_TIDY_CHECKS=1 LLVM_HOST_TRIPLE=x86_64-unknown-linux-gnu LLVM_INCLUDE_BENCHMARKS= LLVM_LIT_TOOLS_DIR= LLVM_TOOLS_DIR=/usr/local/google/home/thakis/src/llvm-project/out/gn/bin LLVM_TARGET_TRIPLE=x86_64-unknown-linux-gnu Python3_EXECUTABLE=python3 CLANGD_BUILD_XPC=0 LLVM_ENABLE_ZLIB=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 126, 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 76, in main
    in_line = var_re.sub(repl, in_line)
  File "/usr/local/google/home/thakis/src/llvm-project/out/gn/../../llvm/utils/gn/build/write_cmake_config.py", line 74, in repl
    return values[key]
           ~~~~~~^^^^^
KeyError: 'CLANG_PLUGIN_SUPPORT'
[5/6850] CXX obj/llvm/lib/Support/Support.DXILABI.o
[6/6850] CXX obj/llvm/lib/Support/Support.UnicodeNameToCodepointGenerated.o
[7/6850] CXX obj/llvm/lib/Support/Support.UnicodeCharSetsGenerated.o
[8/6850] CXX obj/llvm/lib/Support/Support.Unicode.o
[9/6850] CXX obj/llvm/lib/Extensions/Extensions.Extensions.o
[10/6850] CXX obj/llvm/lib/Support/Support.UnicodeNameToCodepoint.o
[11/6850] CXX obj/llvm/lib/Plugins/Plugins.PassPlugin.o
[12/6850] CXX obj/llvm/lib/Support/Support.KnownFPClass.o
[13/6850] ACTION //libcxx/include:copy_headers(//llvm/utils/gn/build/toolchain:unix)
[14/6850] CXX obj/llvm/utils/TableGen/Basic/Basic.RuntimeLibcallsEmitter.o
[15/6850] CXX obj/clang/utils/TableGen/clang-tblgen.NeonEmitter.o
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.