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From github.com:llvm/llvm-project
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   a99a0023301e..1d03535c8f0e  main       -> origin/main
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HEAD is now at 1d03535c8f0e [X86][NewPM] Fill out X86CodeGenPassBuilder (#176061)
INFO:2026-01-15T23:30:28Z:root:syncing...
Deleted branch merge (was a99a0023301e).
Switched to a new branch 'merge'
branch 'merge' set up to track 'origin/main'.
INFO:2026-01-15T23:30:28Z:root:building
ninja: Entering directory `out/gn'
[1/4538] ACTION //libcxx/include:write_config_site(//llvm/utils/gn/build/toolchain:unix)
FAILED: include/c++/v1/__config_site 
python3 ../../llvm/utils/gn/build/write_cmake_config.py -o include/c++/v1/__config_site ../../libcxx/include/__config_site.in _LIBCPP_ABI_FORCE_ITANIUM= _LIBCPP_ABI_FORCE_MICROSOFT= _LIBCPP_ABI_VERSION=1 _LIBCPP_ASSERTION_SEMANTIC_DEFAULT=_LIBCPP_ASSERTION_SEMANTIC_HARDENING_DEPENDENT _LIBCPP_EXTRA_SITE_DEFINES= _LIBCPP_HAS_FILESYSTEM=1 _LIBCPP_HAS_THREADS=1 _LIBCPP_HAS_MONOTONIC_CLOCK=1 _LIBCPP_HAS_MUSL_LIBC= _LIBCPP_HAS_THREAD_API_PTHREAD= _LIBCPP_HAS_THREAD_API_EXTERNAL= _LIBCPP_HAS_THREAD_API_WIN32= _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS= _LIBCPP_HAS_VENDOR_AVAILABILITY_ANNOTATIONS= _LIBCPP_NO_VCRUNTIME= _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION= _LIBCPP_HAS_RANDOM_DEVICE=1 _LIBCPP_HAS_LOCALIZATION=1 _LIBCPP_HAS_UNICODE=1 _LIBCPP_HAS_WIDE_CHARACTERS=1 _LIBCPP_HAS_TERMINAL=1 _LIBCPP_INSTRUMENTED_WITH_ASAN= _LIBCPP_ABI_DEFINES= _LIBCPP_HARDENING_MODE_DEFAULT=_LIBCPP_HARDENING_MODE_NONE _LIBCPP_LIBC_PICOLIBC= _LIBCPP_LIBC_NEWLIB= _LIBCPP_PSTL_BACKEND_LIBDISPATCH= _LIBCPP_PSTL_BACKEND_SERIAL= _LIBCPP_PSTL_BACKEND_STD_THREAD=1 _LIBCPP_ABI_NAMESPACE=__1 _LIBCPP_HAS_TIME_ZONE_DATABASE=1
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 75, in main
    if values[var] == "0":
       ~~~~~~^^^^^
KeyError: '_LIBCPP_LIBC_LLVM_LIBC'
[2/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.GISelChangeObserver.o
[3/4538] CXX obj/llvm/lib/CodeGen/CodeGen.EdgeBundles.o
[4/4538] CXX obj/llvm/lib/CodeGen/CodeGen.AllocationOrder.o
[5/4538] CXX obj/llvm/lib/CodeGen/CodeGen.DeadMachineInstructionElim.o
[6/4538] CXX obj/llvm/lib/CodeGen/CodeGen.DetectDeadLanes.o
[7/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.LegalizerInfo.o
[8/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.MachineFloatingPointPredicateUtils.o
[9/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.GIMatchTableExecutor.o
[10/4538] CXX obj/llvm/lib/CodeGen/CodeGen.ExpandReductions.o
[11/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CallBrPrepare.o
[12/4538] CXX obj/llvm/lib/CodeGen/CodeGen.EHContGuardTargets.o
[13/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CFGuardLongjmp.o
[14/4538] CXX obj/llvm/lib/CodeGen/CodeGen.ExpandPostRAPseudos.o
[15/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CSEInfo.o
[16/4538] CXX obj/llvm/lib/CodeGen/CodeGen.ExecutionDomainFix.o
[17/4538] CXX obj/llvm/lib/CodeGen/CodeGen.BreakFalseDeps.o
[18/4538] CXX obj/llvm/lib/CodeGen/CodeGen.BasicBlockMatchingAndInference.o
[19/4538] CXX obj/llvm/lib/CodeGen/CodeGen.BasicBlockPathCloning.o
[20/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CodeGenCommonISel.o
[21/4538] CXX obj/llvm/lib/CodeGen/CodeGen.FEntryInserter.o
[22/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CalcSpillWeights.o
[23/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CFIFixup.o
[24/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CallingConvLower.o
[25/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CSEMIRBuilder.o
[26/4538] CXX obj/llvm/lib/CodeGen/CodeGen.BranchRelaxation.o
[27/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CombinerHelperArtifacts.o
[28/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CombinerHelperCompares.o
[29/4538] CXX obj/llvm/lib/CodeGen/CodeGen.BasicBlockSections.o
[30/4538] CXX obj/llvm/lib/CodeGen/CodeGen.ExpandMemCmp.o
[31/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CriticalAntiDepBreaker.o
[32/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CombinerHelperVectorOps.o
[33/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CombinerHelperCasts.o
[34/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.Combiner.o
[35/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.Localizer.o
[36/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.InlineAsmLowering.o
[37/4538] CXX obj/llvm/lib/CodeGen/CodeGen.EarlyIfConversion.o
[38/4538] CXX obj/llvm/lib/CodeGen/CodeGen.DFAPacketizer.o
[39/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CFIInstrInserter.o
[40/4538] CXX obj/llvm/lib/CodeGen/CodeGen.Analysis.o
[41/4538] CXX obj/llvm/lib/CodeGen/CodeGen.AggressiveAntiDepBreaker.o
[42/4538] CXX obj/llvm/lib/CodeGen/CodeGen.DwarfEHPrepare.o
[43/4538] CXX obj/llvm/lib/CodeGen/CodeGen.AtomicExpandPass.o
[44/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.InstructionSelect.o
[45/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.MachineIRBuilder.o
[46/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.LoadStoreOpt.o
[47/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CallLowering.o
[48/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.GISelValueTracking.o
[49/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.RegBankSelect.o
[50/4538] CXX obj/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.WinException.o
[51/4538] CXX obj/llvm/lib/CodeGen/CodeGen.ExpandIRInsts.o
[52/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.Utils.o
[53/4538] CXX obj/llvm/lib/CodeGen/CodeGen.BranchFolding.o
[54/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CodeGenTargetMachineImpl.o
[55/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.Legalizer.o
[56/4538] CXX obj/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.DwarfCompileUnit.o
[57/4538] CXX obj/llvm/lib/CodeGen/MIRParser/MIRParser.MIParser.o
[58/4538] CXX obj/llvm/lib/CodeGen/CodeGen.ComplexDeinterleavingPass.o
[59/4538] CXX obj/llvm/lib/CodeGen/CodeGen.BasicTargetTransformInfo.o
[60/4538] CXX obj/bolt/lib/Target/AArch64/AArch64.AArch64MCPlusBuilder.o
[61/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.LegalizerHelper.o
[62/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.IRTranslator.o
[63/4538] CXX obj/llvm/lib/CodeGen/GlobalISel/GlobalISel.CombinerHelper.o
[64/4538] CXX obj/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.DwarfDebug.o
[65/4538] CXX obj/llvm/lib/CodeGen/CodeGen.CodeGenPrepare.o
[66/4538] CXX obj/clang/lib/CodeGen/CodeGen.BackendUtil.o
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.