ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/325] AR lib/libclangOptions.a
[2/325] AR lib/libclangFrontend.a
[3/325] AR lib/libclangCrossTU.a
[4/325] AR lib/libclangDriver.a
[5/325] AR lib/libclangToolingDependencyScanning.a
[6/325] AR lib/libclangStaticAnalyzerCore.a
[7/325] AR lib/liblldbCore.a
[8/325] AR lib/libclangTooling.a
[9/325] ACTION //llvm/utils/llvm-lit:llvm-lit(//llvm/utils/gn/build/toolchain:unix)
FAILED: bin/llvm-lit 
python3 ../../llvm/utils/gn/build/write_cmake_config.py -o bin/llvm-lit ../../llvm/utils/llvm-lit/llvm-lit.in LLVM_SOURCE_DIR=../../../llvm Python3_EXECUTABLE=/usr/bin/env\ python3 BUILD_MODE=. LLVM_LIT_CONFIG_MAP=\#\ Takes\ a\ path\ that\'s\ relative\ to\ __file__\ and\ makes\ it\ absolute.\\ndef\ path\(p\):\\n\ \ \ \ return\ os.path.abspath\(os.path.join\(__file__,\ \'..\',\ p\)\)\ if\ p\ else\ \'\'\\n\\nmap_config\(\\n\ \ \ \ path\(r\'../../../bolt/test/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/bolt/test/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../bolt/test/Unit/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/bolt/test/Unit/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../clang-tools-extra/test/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/clang-tools-extra/test/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../clang-tools-extra/test/Unit/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/clang-tools-extra/test/Unit/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../clang-tools-extra/clangd/test/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/clang-tools-extra/clangd/test/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../clang-tools-extra/clangd/unittests/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/clang-tools-extra/clangd/unittests/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../clang/test/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/clang/test/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../clang/test/Unit/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/clang/test/Unit/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../lld/test/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/lld/test/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../lld/test/Unit/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/lld/test/Unit/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../lldb/test/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/lldb/test/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../lldb/test/API/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/lldb/test/API/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../lldb/test/Shell/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/lldb/test/Shell/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../lldb/test/Unit/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/lldb/test/Unit/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../llvm/test/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/llvm/test/lit.site.cfg.py\'\)\)\\nmap_config\(\\n\ \ \ \ path\(r\'../../../llvm/test/Unit/lit.cfg.py\'\),\\n\ \ \ \ path\(r\'../gen/llvm/test/Unit/lit.site.cfg.py\'\)\)
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 72, 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 70, in repl
    return values[key]
           ~~~~~~^^^^^
KeyError: 'LLVM_WINDOWS_PREFER_FORWARD_SLASH'
[10/325] AR lib/libclangCodeGen.a
[11/325] AR lib/libclangStaticAnalyzerCheckers.a
[12/325] LINK ./bin/clang-offload-bundler
[13/325] LINK ./bin/clang-apply-replacements
[14/325] LINK obj/clang-tools-extra/unittests/clang-apply-replacements/ClangApplyReplacementsTests
[15/325] LINK obj/clang/unittests/Format/FormatTests
[16/325] LINK obj/clang/unittests/DependencyScanning/ClangDependencyScanningTests
[17/325] LINK obj/clang/unittests/Lex/LexTests
[18/325] LINK obj/clang/unittests/Support/ClangSupportTests
[19/325] LINK ./bin/diagtool
[20/325] LINK ./bin/clang-query
[21/325] LINK obj/clang-tools-extra/unittests/clang-doc/ClangDocTests
[22/325] LINK obj/clang-tools-extra/unittests/clang-change-namespace/ClangChangeNamespaceTests
[23/325] LINK ./bin/clang-doc
[24/325] LINK obj/clang-tools-extra/unittests/clang-move/ClangMoveTests
[25/325] LINK ./bin/clang-include-fixer
[26/325] LINK obj/clang/unittests/Serialization/SerializationTests
[27/325] LINK ./bin/clang-refactor
[28/325] LINK ./bin/pp-trace
[29/325] LINK obj/clang/unittests/Analysis/Scalable/ClangScalableAnalysisTests
[30/325] LINK ./bin/clang-reorder-fields
[31/325] LINK obj/clang-tools-extra/unittests/clang-include-fixer/find-all-symbols/FindAllSymbolsTests
[32/325] LINK ./bin/clang-diff
[33/325] LINK obj/clang/unittests/Tooling/Syntax/SyntaxTests
[34/325] LINK ./bin/find-all-symbols
[35/325] LINK ./bin/clang-extdef-mapping
[36/325] LINK obj/clang/unittests/CrossTU/CrossTUTests
[37/325] LINK obj/clang/unittests/AST/ByteCode/InterpTests
[38/325] LINK obj/clang-tools-extra/unittests/clang-include-fixer/ClangIncludeFixerTests
[39/325] LINK ./bin/modularize
[40/325] LINK ./bin/clang-move
[41/325] LINK ./bin/clang-installapi
[42/325] LINK obj/clang/unittests/Sema/SemaTests
[43/325] LINK obj/clang/unittests/ASTMatchers/ASTMatchersTests
[44/325] LINK obj/clang/unittests/Rewrite/RewriteTests
[45/325] LINK obj/clang/unittests/Analysis/ClangAnalysisTests
[46/325] LINK obj/clang/unittests/Index/IndexTests
[47/325] LINK obj/clang-tools-extra/unittests/clang-query/ClangQueryTests
[48/325] LINK obj/clang/unittests/ASTMatchers/Dynamic/DynamicASTMatchersTests
[49/325] LINK ./bin/clang-change-namespace
[50/325] LINK obj/clang/unittests/AST/ASTTests
[51/325] LINK obj/clang/unittests/Analysis/FlowSensitive/ClangAnalysisFlowSensitiveTests
[52/325] LINK obj/clang/unittests/Driver/ClangDriverTests
[53/325] SOLINK ./lib/libclang.so
[54/325] LINK obj/clang/unittests/Tooling/ToolingTests
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.