我正在尝试构建 LLVM 并将其与 libc++ 链接，但我无法让它工作。我下载了最新版本（LLVM 3.2）。
$ CXXFLAGS=-stdlib=libc++ LDFLAGS=-stdlib=libc++ ../llvm-3.2.src/configure
$ make
llvm[0]: Constructing LLVMBuild project information.
llvm[1]: Compiling APFloat.cpp for Release+Asserts build
llvm[1]: Compiling APInt.cpp for Release+Asserts build
(etcetera)
llvm[1]: Building Release+Asserts Archive Library libLLVMTableGen.a
llvm[2]: Compiling FileCheck.cpp for Release+Asserts build
llvm[2]: Linking Release+Asserts executable FileCheck (without symbols)
Undefined symbols for architecture x86_64:
"std::string::find_last_not_of(char, unsigned long) const", referenced from:
llvm::SMDiagnostic::print(char const*, llvm::raw_ostream&, bool) const in libLLVMSupport.a(SourceMgr.o)
"std::string::copy(char*, unsigned long, unsigned long) const", referenced from:
llvm::sys::Path::makeUnique(bool, std::string*) in libLLVMSupport.a(Path.o)
"std::string::find(char const*, unsigned long, unsigned long) const", referenced from:
llvm::sys::getDefaultTargetTriple() in libLLVMSupport.a(Host.o)
"std::string::find(char, unsigned long) const", referenced from:
llvm::sys::Program::FindProgramByName(std::string const&) in libLLVMSupport.a(Program.o)
(followed by a bunch of other related linker errors)
在Gist上完成输出。
LLVM 可以使用 libstdc++ 编译和链接，但不能使用 libc++。我不知道为什么它不会与 libc++ 链接；其他程序只是链接正常。我正在运行 OS X Mountain Lion，而 libc++ 位于/usr/lib/libc++.1.dylib. 使用的编译器是Apple clang 版本 4.0 (tags/Apple/clang-421.0.60) (基于 LLVM 3.1svn)。