ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/728] 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'
[2/728] ACTION //clang/include/clang/Options:Options(//llvm/utils/gn/build/toolchain:unix)
[3/728] ACTION //llvm/tools/llvm-exegesis/lib/X86:X86GenExegesis(//llvm/utils/gn/build/toolchain:unix)
[4/728] ACTION //llvm/lib/Target/X86:X86GenCallingConv(//llvm/utils/gn/build/toolchain:unix)
[5/728] ACTION //llvm/lib/Target/X86:X86GenRegisterBank(//llvm/utils/gn/build/toolchain:unix)
[6/728] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenRegisterInfo(//llvm/utils/gn/build/toolchain:unix)
[7/727] ACTION //llvm/lib/Target/X86:X86GenPostLegalizeGICombiner(//llvm/utils/gn/build/toolchain:unix)
[8/727] ACTION //llvm/lib/Target/X86:X86GenPreLegalizeGICombiner(//llvm/utils/gn/build/toolchain:unix)
[9/727] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenMnemonicTables(//llvm/utils/gn/build/toolchain:unix)
[10/727] ACTION //llvm/lib/Target/X86:X86GenInstrMapping(//llvm/utils/gn/build/toolchain:unix)
[11/727] CXX obj/clang/lib/Basic/Targets/Basic.X86.o
[12/727] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenAsmWriter1(//llvm/utils/gn/build/toolchain:unix)
[13/727] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenAsmWriter(//llvm/utils/gn/build/toolchain:unix)
[14/727] ACTION //llvm/lib/Target/X86/Disassembler:X86GenDisassemblerTables(//llvm/utils/gn/build/toolchain:unix)
[15/727] ACTION //llvm/lib/Target/X86/AsmParser:X86GenAsmMatcher(//llvm/utils/gn/build/toolchain:unix)
[16/727] ACTION //llvm/lib/Target/X86:X86GenFoldTables(//llvm/utils/gn/build/toolchain:unix)
[17/727] ACTION //llvm/lib/Target/X86:X86GenFastISel(//llvm/utils/gn/build/toolchain:unix)
[18/727] ACTION //llvm/lib/Target/X86:X86GenGlobalISel(//llvm/utils/gn/build/toolchain:unix)
[19/727] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenSubtargetInfo(//llvm/utils/gn/build/toolchain:unix)
[20/727] ACTION //llvm/lib/Target/X86:X86GenDAGISel(//llvm/utils/gn/build/toolchain:unix)
[21/727] CXX obj/clang/lib/Basic/Basic.Targets.o
[22/727] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenInstrInfo(//llvm/utils/gn/build/toolchain:unix)
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.