clang: error: linker command failed due to signal (use -v to see invocation)

~/Documents/llvm-project/build$ ninja

After over 2,000 files compiled.

[25/1074] Linking CXX executable bin/llvm-lto
FAILED: bin/llvm-lto
: && /usr/bin/clang++ -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -std=c++11 -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fdiagnostics-color -g -Wl,-allow-shlib-undefined -Wl,-rpath-link,/home/nnelson/Documents/llvm-project/build/./lib tools/llvm-lto/CMakeFiles/llvm-lto.dir/llvm-lto.cpp.o -o bin/llvm-lto -Wl,-rpath,“$ORIGIN/…/lib” lib/libLLVMAArch64AsmParser.a lib/libLLVMAMDGPUAsmParser.a lib/libLLVMARMAsmParser.a lib/libLLVMBPFAsmParser.a lib/libLLVMHexagonAsmParser.a lib/libLLVMLanaiAsmParser.a lib/libLLVMMipsAsmParser.a lib/libLLVMMSP430AsmParser.a lib/libLLVMPowerPCAsmParser.a lib/libLLVMSparcAsmParser.a lib/libLLVMSystemZAsmParser.a lib/libLLVMWebAssemblyAsmParser.a lib/libLLVMX86AsmParser.a lib/libLLVMAArch64CodeGen.a lib/libLLVMAMDGPUCodeGen.a lib/libLLVMARMCodeGen.a lib/libLLVMBPFCodeGen.a lib/libLLVMHexagonCodeGen.a lib/libLLVMLanaiCodeGen.a lib/libLLVMMipsCodeGen.a lib/libLLVMMSP430CodeGen.a lib/libLLVMNVPTXCodeGen.a lib/libLLVMPowerPCCodeGen.a lib/libLLVMSparcCodeGen.a lib/libLLVMSystemZCodeGen.a lib/libLLVMWebAssemblyCodeGen.a lib/libLLVMX86CodeGen.a lib/libLLVMXCoreCodeGen.a lib/libLLVMAArch64Desc.a lib/libLLVMAMDGPUDesc.a lib/libLLVMARMDesc.a lib/libLLVMBPFDesc.a lib/libLLVMHexagonDesc.a lib/libLLVMLanaiDesc.a lib/libLLVMMipsDesc.a lib/libLLVMMSP430Desc.a lib/libLLVMNVPTXDesc.a lib/libLLVMPowerPCDesc.a lib/libLLVMSparcDesc.a lib/libLLVMSystemZDesc.a lib/libLLVMWebAssemblyDesc.a lib/libLLVMX86Desc.a lib/libLLVMXCoreDesc.a lib/libLLVMAArch64Info.a lib/libLLVMAMDGPUInfo.a lib/libLLVMARMInfo.a lib/libLLVMBPFInfo.a lib/libLLVMHexagonInfo.a lib/libLLVMLanaiInfo.a lib/libLLVMMipsInfo.a lib/libLLVMMSP430Info.a lib/libLLVMNVPTXInfo.a lib/libLLVMPowerPCInfo.a lib/libLLVMSparcInfo.a lib/libLLVMSystemZInfo.a lib/libLLVMWebAssemblyInfo.a lib/libLLVMX86Info.a lib/libLLVMXCoreInfo.a lib/libLLVMBitReader.a lib/libLLVMBitWriter.a lib/libLLVMCore.a lib/libLLVMIRReader.a lib/libLLVMLTO.a lib/libLLVMMC.a lib/libLLVMObject.a lib/libLLVMSupport.a lib/libLLVMTarget.a -lpthread lib/libLLVMAArch64Utils.a lib/libLLVMAMDGPUUtils.a lib/libLLVMMIRParser.a lib/libLLVMARMUtils.a lib/libLLVMHexagonAsmParser.a lib/libLLVMHexagonDesc.a lib/libLLVMHexagonInfo.a lib/libLLVMLanaiAsmParser.a lib/libLLVMLanaiDesc.a lib/libLLVMLanaiInfo.a lib/libLLVMMCDisassembler.a lib/libLLVMGlobalISel.a lib/libLLVMX86Utils.a lib/libLLVMAsmPrinter.a lib/libLLVMDebugInfoDWARF.a lib/libLLVMSelectionDAG.a lib/libLLVMObjCARCOpts.a lib/libLLVMPasses.a lib/libLLVMCodeGen.a lib/libLLVMTarget.a lib/libLLVMipo.a lib/libLLVMBitWriter.a lib/libLLVMIRReader.a lib/libLLVMAsmParser.a lib/libLLVMScalarOpts.a lib/libLLVMVectorize.a lib/libLLVMLinker.a lib/libLLVMAggressiveInstCombine.a lib/libLLVMInstCombine.a lib/libLLVMInstrumentation.a lib/libLLVMTransformUtils.a lib/libLLVMAnalysis.a lib/libLLVMObject.a lib/libLLVMBitReader.a lib/libLLVMMCParser.a lib/libLLVMMC.a lib/libLLVMDebugInfoCodeView.a lib/libLLVMDebugInfoMSF.a lib/libLLVMProfileData.a lib/libLLVMCore.a lib/libLLVMBinaryFormat.a lib/libLLVMRemarks.a lib/libLLVMSupport.a -lz -lrt -ldl -ltinfo -lpthread -lm lib/libLLVMDemangle.a && :
clang: error: unable to execute command: Killed
clang: error: linker command failed due to signal (use -v to see invocation)

I’d first try to see if it was caused by an out-of-memory error. How much memory does your machine have?

Try ninja -j1 and see if the problem persists.