ninja: Entering directory `out/gn'
[1/521] LINK obj/llvm/unittests/ProfileData/ProfileDataTests
[2/521] LINK ./bin/llvm-profdata
[3/521] LINK ./bin/llvm-ctxprof-util
[4/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.AArch64InstPrinterTest.o
[5/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.DecomposeStackOffsetTest.o
[6/521] AR lib/liblldbPluginClangCommon.a
[7/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.MCInstrAnalysisTest.o
[8/521] AR lib/liblldbDataFormatters.a
[9/521] 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_PSTL_BACKEND_LIBDISPATCH= _LIBCPP_PSTL_BACKEND_SERIAL= _LIBCPP_PSTL_BACKEND_STD_THREAD=1 _LIBCPP_ABI_NAMESPACE=__1 _LIBCPP_HAS_TIME_ZONE_DATABASE=
Traceback (most recent call last):
  File "/Users/thakis/src/llvm-project/out/gn/../../llvm/utils/gn/build/write_cmake_config.py", line 122, in <module>
    sys.exit(main())
  File "/Users/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_PICOLIBC'
[10/521] AR lib/liblldbCommands.a
[11/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.AddressingModes.o
[12/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.AArch64RegisterInfoTest.o
[13/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.Immediates.o
[14/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.AArch64SVESchedPseudoTest.o
[15/521] CXX obj/llvm/tools/llvm-exegesis/lib/AArch64/AArch64.Target.o
[16/521] CXX obj/llvm/unittests/tools/llvm-exegesis/AArch64/LLVMExegesisAArch64Tests.TargetTest.o
[17/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.InstSizes.o
[18/521] CXX obj/llvm/unittests/Target/AArch64/AArch64Tests.MatrixRegisterAliasing.o
ninja: build stopped: subcommand failed.
Command '['ninja', '-C', 'out/gn']' returned non-zero exit status 1.