ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/340] ACTION //bolt/tools/driver:llvm-boltdiff(//llvm/utils/gn/build/toolchain:unix)
[2/340] ACTION //bolt/tools/driver:perf2bolt(//llvm/utils/gn/build/toolchain:unix)
[3/340] ACTION //llvm/tools/llvm-ml:llvm-ml64(//llvm/utils/gn/build/toolchain:unix)
[4/340] 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'
[5/340] LINK ./bin/llvm-cxxmap
[6/340] LINK obj/llvm/unittests/CGData/CodeGenDataTests
[7/340] LINK obj/llvm/unittests/ExecutionEngine/JITLink/JITLinkTests
[8/340] LINK obj/llvm/unittests/DebugInfo/GSYM/DebugInfoGSYMTests
[9/340] LINK ./bin/llvm-xray
[10/340] LINK ./bin/llvm-cxxdump
[11/340] LINK obj/llvm/unittests/Target/WebAssembly/WebAssemblyTests
[12/340] LINK ./bin/llvm-ar
[13/340] LINK ./bin/llvm-rtdyld
[14/340] LINK obj/llvm/unittests/MC/MCTests
[15/340] LINK ./bin/llvm-mc
[16/340] LINK obj/llvm/unittests/Passes/PassBuilderBindings/PassesBindingsTests
[17/340] LINK ./bin/llvm-exegesis
[18/340] LINK obj/llvm/unittests/Target/TargetMachineCTests
[19/340] LINK ./bin/dsymutil
[20/340] LINK ./bin/llvm-dwp
[21/340] LINK ./bin/llvm-dwarfutil
[22/340] LINK obj/llvm/unittests/MIR/MIRTests
[23/340] LINK obj/llvm/unittests/MI/MITests
[24/340] LINK ./bin/llc
[25/340] LINK ./bin/opt
[26/340] LINK ./bin/llvm-reduce
[27/340] LINK obj/llvm/unittests/CodeGen/GlobalISel/GlobalISelTests
[28/340] LINK ./bin/llvm-opt-fuzzer
[29/340] LINK obj/lld/unittests/AsLibELF/LLDAsLibELFTests
[30/340] LINK ./bin/llvm-split
[31/340] SOLINK ./lib/libLTO.so
[32/340] LINK obj/lld/unittests/AsLibAll/LLDAsLibAllTests
[33/340] LINK obj/llvm/unittests/DebugInfo/DWARF/DebugInfoDWARFTests
[34/340] LINK obj/llvm/unittests/CodeGen/CodeGenTests
[35/340] LINK obj/llvm/unittests/DebugInfo/LogicalView/DebugInfoLogicalViewTests
[36/340] LINK ./bin/llvm-c-test
[37/340] LINK ./bin/lld
[38/340] LINK ./bin/clang
[39/340] LINK ./bin/lldb-test
[40/340] LINK ./bin/lldb-dap
[41/340] CXX obj/clang/lib/Tooling/Tooling.DependencyScanningTool.o
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.