build error

[aiiiii96]

When I make -j4 in llvm-project/build, i met these errors:

[ 96%] Linking CXX shared library ../../../../lib/libclang.so

/usr/bin/ld: ../../lib/libLLVMAArch64CodeGen.a(AArch64TargetMachine.cpp.o): in function `llvm::AArch64TargetMachine::AArch64TargetMachine(llvm::Target const&, llvm::Triple const&, llvm::StringRef, llvm::StringRef, llvm::TargetOptions const&, llvm::Optionalllvm::Reloc::Model, llvm::Optionalllvm::CodeModel::Model, llvm::CodeGenOpt::Level, bool, bool)':
........

undefined reference to llvm::LiveRegMatrix::unassign(llvm::LiveInterval&)' /usr/bin/ld: /home/ai/Desktop/morpher/llvm-project/llvm/lib/CodeGen/RegAllocGreedy.cpp:2975: undefined reference to llvm::LiveRegMatrix::assign(llvm::LiveInterval&, unsigned int)'
/usr/bin/ld: ../../../../lib/libLLVMCodeGen.a(RegAllocBase.cpp.o): in function llvm::RegAllocBase::allocatePhysRegs()': /home/ai/Desktop/morpher/llvm-project/llvm/lib/CodeGen/RegAllocBase.cpp:142: undefined reference to llvm::LiveRegMatrix::assign(llvm::LiveInterval&, unsigned int)'
collect2: error: ld returned 1 exit status
make[2]: *** [tools/clang/tools/libclang/CMakeFiles/libclang.dir/build.make:549: lib/libclang.so.10] Error 1
make[1]: *** [CMakeFiles/Makefile2:37816: tools/clang/tools/libclang/CMakeFiles/libclang.dir/all] Error 2
make: *** [Makefile:152: all] Error 2