ninja: Entering directory `out/gn'
[0/1] Regenerating ninja files
[1/454] ACTION //llvm/include/llvm/TargetParser:ARMTargetParserDef(//llvm/utils/gn/build/toolchain:unix)
[2/454] ACTION //llvm/lib/Target/ARM:ARMGenMCPseudoLowering(//llvm/utils/gn/build/toolchain:unix)
[3/454] ACTION //llvm/lib/Target/ARM:ARMGenSDNodeInfo(//llvm/utils/gn/build/toolchain:unix)
[4/453] 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'
[5/453] ACTION //llvm/lib/Target/ARM/Utils:ARMGenSystemRegister(//llvm/utils/gn/build/toolchain:unix)
[6/453] ACTION //llvm/lib/Target/ARM:ARMGenRegisterBank(//llvm/utils/gn/build/toolchain:unix)
[7/453] ACTION //llvm/lib/Target/ARM/MCTargetDesc:ARMGenMCCodeEmitter(//llvm/utils/gn/build/toolchain:unix)
[8/453] ACTION //llvm/lib/Target/ARM:ARMGenCallingConv(//llvm/utils/gn/build/toolchain:unix)
[9/453] ACTION //llvm/lib/Target/ARM/MCTargetDesc:ARMGenRegisterInfo(//llvm/utils/gn/build/toolchain:unix)
[10/453] ACTION //llvm/lib/Target/ARM/Disassembler:ARMGenDisassemblerTables(//llvm/utils/gn/build/toolchain:unix)
[11/453] ACTION //llvm/lib/Target/ARM/MCTargetDesc:ARMGenAsmWriter(//llvm/utils/gn/build/toolchain:unix)
[12/453] ACTION //llvm/lib/Target/ARM/AsmParser:ARMGenAsmMatcher(//llvm/utils/gn/build/toolchain:unix)
[13/453] ACTION //llvm/lib/Target/ARM:ARMGenFastISel(//llvm/utils/gn/build/toolchain:unix)
[14/453] ACTION //llvm/lib/Target/ARM/MCTargetDesc:ARMGenSubtargetInfo(//llvm/utils/gn/build/toolchain:unix)
[15/453] ACTION //llvm/lib/Target/ARM:ARMGenGlobalISel(//llvm/utils/gn/build/toolchain:unix)
[16/453] ACTION //llvm/lib/Target/ARM:ARMGenDAGISel(//llvm/utils/gn/build/toolchain:unix)
[17/453] ACTION //llvm/lib/Target/ARM/MCTargetDesc:ARMGenInstrInfo(//llvm/utils/gn/build/toolchain:unix)
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.