ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/304] ACTION //bolt/tools/driver:llvm-boltdiff(//llvm/utils/gn/build/toolchain:unix)
[2/304] ACTION //bolt/tools/driver:perf2bolt(//llvm/utils/gn/build/toolchain:unix)
[3/304] LINK obj/clang/unittests/libclang/CrashTests/libclangCrashTests
[4/304] ACTION //llvm/tools/llvm-ml:llvm-ml64(//llvm/utils/gn/build/toolchain:unix)
[5/304] LINK obj/clang/unittests/libclang/libclangTests
[6/304] 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'
[7/304] LINK ./bin/llvm-cxxmap
[8/304] LINK obj/llvm/unittests/CGData/CodeGenDataTests
[9/304] LINK ./bin/llvm-mca
[10/304] LINK ./bin/llvm-nm
[11/304] LINK obj/llvm/unittests/ExecutionEngine/JITLink/JITLinkTests
[12/304] LINK obj/llvm/unittests/DebugInfo/GSYM/DebugInfoGSYMTests
[13/304] LINK ./bin/llvm-cxxdump
[14/304] LINK ./bin/llvm-xray
[15/304] LINK obj/llvm/unittests/tools/llvm-cfi-verify/CFIVerifyTests
[16/304] LINK ./bin/llvm-rtdyld
[17/304] LINK ./bin/llvm-cfi-verify
[18/304] LINK ./bin/llvm-ar
[19/304] LINK obj/llvm/unittests/MC/MCTests
[20/304] LINK obj/llvm/unittests/tools/llvm-exegesis/AArch64/LLVMExegesisAArch64Tests
[21/304] LINK obj/llvm/unittests/Passes/PassBuilderBindings/PassesBindingsTests
[22/304] LINK ./bin/llvm-exegesis
[23/304] LINK ./bin/c-index-test
[24/304] LINK obj/clang/unittests/Sema/SemaTests
[25/304] LINK obj/clang/unittests/Index/IndexTests
[26/304] LINK ./bin/llvm-ir2vec
[27/304] LINK ./bin/dsymutil
[28/304] LINK ./bin/llc
[29/304] LINK ./bin/clang-extdef-mapping
[30/304] LINK obj/clang/unittests/Rewrite/RewriteTests
[31/304] LINK ./bin/llvm-reduce
[32/304] LINK obj/clang/unittests/Tooling/Syntax/SyntaxTests
[33/304] LINK ./bin/llvm-split
[34/304] LINK obj/llvm/unittests/MI/MITests
[35/304] LINK obj/lld/unittests/AsLibELF/LLDAsLibELFTests
[36/304] LINK obj/clang/unittests/StaticAnalyzer/StaticAnalysisTests
[37/304] LINK ./bin/llvm-c-test
[38/304] LINK obj/llvm/unittests/DebugInfo/DWARF/DebugInfoDWARFTests
[39/304] LINK ./bin/opt
[40/304] LINK ./bin/llvm-opt-fuzzer
[41/304] LINK obj/llvm/unittests/DebugInfo/LogicalView/DebugInfoLogicalViewTests
[42/304] SOLINK ./lib/libLTO.so
[43/304] LINK obj/llvm/unittests/CodeGen/CodeGenTests
[44/304] LINK obj/llvm/unittests/MIR/MIRTests
[45/304] LINK ./bin/lld
[46/304] LINK obj/llvm/unittests/CodeGen/GlobalISel/GlobalISelTests
[47/304] LINK obj/lld/unittests/AsLibAll/LLDAsLibAllTests
[48/304] LINK ./bin/clang-tidy
[49/304] LINK obj/clang/unittests/Interpreter/ExceptionTests/ClangReplInterpreterExceptionTests
[50/304] LINK obj/clang/unittests/Tooling/ToolingTests
[51/304] LINK obj/clang/unittests/Interpreter/ClangReplInterpreterTests
[52/304] LINK ./bin/lldb-test
[53/304] LINK ./bin/clang
[54/304] LINK ./bin/lldb-dap
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.