ninja: Entering directory `out/gn'
[1/511] 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'
[2/511] CXX obj/llvm/unittests/IR/IRTests.DominatorTreeBatchUpdatesTest.o
[3/511] CXX obj/clang/lib/Analysis/Analysis.Dominators.o
[4/511] CXX obj/llvm/unittests/Analysis/AnalysisTests.DomTreeUpdaterTest.o
[5/511] CXX obj/llvm/lib/CodeGen/CodeGen.MachinePostDominators.o
[6/511] CXX obj/llvm/lib/CodeGen/CodeGen.MachineDominators.o
[7/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPlanUncountableExitTest.o
[8/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPlanPatternMatchTest.o
[9/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlanVerifier.o
[10/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlanUtils.o
[11/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPlanHCFGTest.o
[12/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPlanVerifierTest.o
[13/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPDomTreeTest.o
[14/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPlanSlpTest.o
[15/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlanUnroll.o
[16/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlanAnalysis.o
[17/511] CXX obj/llvm/lib/IR/IR.Dominators.o
[18/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPPostDomFrontierTest.o
[19/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlanConstruction.o
[20/511] CXX obj/clang/lib/StaticAnalyzer/Checkers/Checkers.DebugCheckers.o
[21/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlanRecipes.o
[22/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlan.o
[23/511] CXX obj/llvm/unittests/Transforms/Vectorize/VectorizeTests.VPlanTest.o
[24/511] CXX obj/clang/lib/StaticAnalyzer/Core/Core.BugReporterVisitors.o
[25/511] CXX obj/clang/unittests/Analysis/ClangAnalysisTests.CFGDominatorTree.o
[26/511] CXX obj/bolt/lib/Core/Core.BinaryFunction.o
[27/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.VPlanTransforms.o
[28/511] CXX obj/llvm/lib/Transforms/Vectorize/Vectorize.LoopVectorize.o
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.