INFO:2026-01-15T12:27:43Z:root:pulling...
From github.com:llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   1457732b667f..ab6b6c95e08f  main       -> origin/main
Switched to branch 'main'
Your branch is behind 'origin/main' by 3 commits, and can be fast-forwarded.
  (use "git pull" to update your local branch)
HEAD is now at ab6b6c95e08f [X86][GISEL] Enable Combines for constants and undef (#175711)
INFO:2026-01-15T12:27:46Z:root:syncing...
Deleted branch merge (was 1457732b667f).
Switched to a new branch 'merge'
branch 'merge' set up to track 'origin/main'.
INFO:2026-01-15T12:27:47Z:root:building
ninja: Entering directory `out/gn'
[1/679] 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'
[2/679] ACTION //llvm/tools/llvm-exegesis/lib/X86:X86GenExegesis(//llvm/utils/gn/build/toolchain:unix)
[3/679] ACTION //llvm/lib/Target/X86:X86GenCallingConv(//llvm/utils/gn/build/toolchain:unix)
[4/679] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenRegisterInfo(//llvm/utils/gn/build/toolchain:unix)
[5/678] ACTION //llvm/lib/Target/X86:X86GenRegisterBank(//llvm/utils/gn/build/toolchain:unix)
[6/678] ACTION //llvm/lib/Target/X86:X86GenPreLegalizeGICombiner(//llvm/utils/gn/build/toolchain:unix)
[7/678] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenMnemonicTables(//llvm/utils/gn/build/toolchain:unix)
[8/678] ACTION //llvm/lib/Target/X86:X86GenInstrMapping(//llvm/utils/gn/build/toolchain:unix)
[9/678] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenAsmWriter(//llvm/utils/gn/build/toolchain:unix)
[10/678] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenAsmWriter1(//llvm/utils/gn/build/toolchain:unix)
[11/678] ACTION //llvm/lib/Target/X86/Disassembler:X86GenDisassemblerTables(//llvm/utils/gn/build/toolchain:unix)
[12/678] ACTION //llvm/lib/Target/X86:X86GenFoldTables(//llvm/utils/gn/build/toolchain:unix)
[13/678] ACTION //llvm/lib/Target/X86/AsmParser:X86GenAsmMatcher(//llvm/utils/gn/build/toolchain:unix)
[14/678] CXX obj/llvm/lib/CodeGen/CodeGen.CFIInstrInserter.o
[15/678] ACTION //llvm/lib/Target/X86:X86GenFastISel(//llvm/utils/gn/build/toolchain:unix)
[16/678] ACTION //llvm/lib/Target/X86:X86GenGlobalISel(//llvm/utils/gn/build/toolchain:unix)
[17/678] ACTION //llvm/lib/Target/X86:X86GenDAGISel(//llvm/utils/gn/build/toolchain:unix)
[18/678] ACTION //llvm/lib/Target/X86/MCTargetDesc:X86GenSubtargetInfo(//llvm/utils/gn/build/toolchain:unix)
[19/678] 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.