构建万花筒llvm时，架构x86_64的未定义符号：“ std :: terminate（）”

Question

I'm doing the kaleidoscope tutorial. I'm on step two.

https://github.com/westymatt/creole

But I get this error when building with clang++

clang++ -Wno-c++11-extensions -g -std=c++11  -I/usr/local/Cellar/llvm/3.6.1/include    -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS src/lexer.cc src/parser.cc -L/usr/local/Cellar/llvm/3.6.1/lib/ -lLLVMX86Disassembler -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMCodeGen -lLLVMScalarOpts -lLLVMProfileData -lLLVMInstCombine -lLLVMTransformUtils -lLLVMipa -lLLVMAnalysis -lLLVMTarget -lLLVMX86Desc -lLLVMObject -lLLVMMCParser -lLLVMBitReader -lLLVMMCDisassembler -lLLVMX86Info -lLLVMX86AsmPrinter -lLLVMMC -lLLVMX86Utils -lLLVMCore -lLLVMSupport -lc++ -O0 -o creole
Undefined symbols for architecture x86_64:
  "std::terminate()", referenced from:
      ___clang_call_terminate in lexer-608bbc.o
      ___clang_call_terminate in parser-09b617.o
ld: symbol(s) not found for architecture x86_64

Answer 1

std::terminate is located inside libc++ on OSX (which I assume you're using because of the "Cellar" in your path there). You appear to be explicitly linking against libc++ which means that the ordering is likely going wrong on your link line.

I can't duplicate this using the actual tutorial sources from top of tree (I don't have 3.6.1 checked out), but I'd suggest you follow the example Makefiles in there. The link line for a given part of the tutorial looks like:

clang++ -Wl,-dead_strip -rdynamic -Wl,-rpath -Wl,@executable_path/../lib -L/Users/echristo/builds/build-llvm/Debug+Asserts/lib -L/Users/echristo/builds/build-llvm/Debug+Asserts/lib -m64 -o /Users/echristo/builds/build-llvm/Debug+Asserts/examples/Kaleidoscope-Ch4 /Users/echristo/builds/build-llvm/examples/Kaleidoscope/Chapter4/Debug+Asserts/toy.o \\ -lLLVMX86Disassembler -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMCodeGen -lLLVMScalarOpts -lLLVMProfileData -lLLVMInstCombine -lLLVMInstrumentation -lLLVMTransformUtils -lLLVMipa -lLLVMX86Desc -lLLVMMCDisassembler -lLLVMX86Info -lLLVMX86AsmPrinter -lLLVMX86Utils -lLLVMMCJIT -lLLVMExecutionEngine -lLLVMTarget -lLLVMAnalysis -lLLVMRuntimeDyld -lLLVMObject -lLLVMMCParser -lLLVMBitReader -lLLVMMC -lLLVMCore -lLLVMSupport -lz -lpthread -ledit -lcurses -lm

which should give you an idea of what it'll look like.

From looking at your sources on github it looks like you've gone to a "include the output of llvm-config on the command line" which isn't very reliable as components may change, etc.

clang++ -g -O3 toy.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core` -o toy

from the tutorial should be enough to compile your simple example. Just replace toy.cpp with both of your example files since you split it up.

Answer 2

I got this error, while I was linking my code with my static lib built with ARC but there were some Objective C file with .mm extension. When I rename them with .m, worked fine.

Answer 3

根据这一点，您需要确保函数的实现都具有相应的声明。