Rust fails to build with custom llvm

[andrewrynhard]

I am getting the following error when compiling for darwin with nix:

error: linking with `cc` failed: exit code: 1
note: "cc" "-m64" "-L" "/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib" "x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib/rustc_llvm-1bf6e69c.0.o" "-o" "x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib/librustc_llvm-1bf6e69c.dylib" "x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib/rustc_llvm-1bf6e69c.metadata.o" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib" "-l" "std-1bf6e69c" "-L" "x86_64-apple-darwin/rt" "-L" "/nix/store/lzpl4l44nrcn3k1d9yl48jwhcylb71c6-llvm-3.7.0/lib" "-L" "/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib" "-L" "/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/.rust/lib/x86_64-apple-darwin" "-L" "/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/lib/x86_64-apple-darwin" "-Wl,-force_load,x86_64-apple-darwin/rt/librustllvm.a" "-l" "LLVMInterpreter" "-l" "LLVMMCJIT" "-l" "LLVMExecutionEngine" "-l" "LLVMRuntimeDyld" "-l" "LLVMAsmParser" "-l" "LLVMLinker" "-l" "LLVMBitWriter" "-l" "LLVMipo" "-l" "LLVMVectorize" "-l" "LLVMPowerPCDisassembler" "-l" "LLVMPowerPCCodeGen" "-l" "LLVMPowerPCAsmParser" "-l" "LLVMPowerPCDesc" "-l" "LLVMPowerPCInfo" "-l" "LLVMPowerPCAsmPrinter" "-l" "LLVMMipsDisassembler" "-l" "LLVMMipsCodeGen" "-l" "LLVMMipsAsmParser" "-l" "LLVMMipsDesc" "-l" "LLVMMipsInfo" "-l" "LLVMMipsAsmPrinter" "-l" "LLVMAArch64Disassembler" "-l" "LLVMAArch64CodeGen" "-l" "LLVMAArch64AsmParser" "-l" "LLVMAArch64Desc" "-l" "LLVMAArch64Info" "-l" "LLVMAArch64AsmPrinter" "-l" "LLVMAArch64Utils" "-l" "LLVMARMDisassembler" "-l" "LLVMARMCodeGen" "-l" "LLVMARMAsmParser" "-l" "LLVMARMDesc" "-l" "LLVMARMInfo" "-l" "LLVMARMAsmPrinter" "-l" "LLVMX86Disassembler" "-l" "LLVMX86AsmParser" "-l" "LLVMX86CodeGen" "-l" "LLVMSelectionDAG" "-l" "LLVMAsmPrinter" "-l" "LLVMCodeGen" "-l" "LLVMTarget" "-l" "LLVMScalarOpts" "-l" "LLVMProfileData" "-l" "LLVMInstCombine" "-l" "LLVMInstrumentation" "-l" "LLVMTransformUtils" "-l" "LLVMipa" "-l" "LLVMAnalysis" "-l" "LLVMX86Desc" "-l" "LLVMObject" "-l" "LLVMMCParser" "-l" "LLVMBitReader" "-l" "LLVMMCDisassembler" "-l" "LLVMX86Info" "-l" "LLVMX86AsmPrinter" "-l" "LLVMMC" "-l" "LLVMX86Utils" "-l" "LLVMCore" "-l" "LLVMSupport" "-l" "ncurses" "-l" "pthread" "-l" "z" "-l" "m" "-l" "c++" "-l" "System" "-l" "c" "-l" "m" "-dynamiclib" "-Wl,-dylib" "-Wl,-install_name,@rpath/librustc_llvm-1bf6e69c.dylib" "-Wl,-rpath,@loader_path/" "-Wl,-rpath,/usr/local/lib/rustlib/x86_64-apple-darwin/lib" "-l" "compiler-rt"
note: ld: warning: directory not found for option '-L/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/.rust/lib/x86_64-apple-darwin'
ld: warning: directory not found for option '-L/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/lib/x86_64-apple-darwin'
Undefined symbols for architecture x86_64:
  "_ffi_type_double", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_type_pointer", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_type_sint16", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_type_void", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_type_sint64", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_prep_cif", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_type_sint32", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_type_sint8", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_type_float", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
  "_ffi_call", referenced from:
      llvm::Interpreter::callExternalFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) in libLLVMInterpreter.a(ExternalFunctions.cpp.o)
ld: symbol(s) not found for architecture x86_64
clang-3.6: error: linker command failed with exit code 1 (use -v to see invocation)

error: aborting due to previous error
/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4/rustc-1.4.0-src.tar.gz/mk/target.mk:164: recipe for target 'x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib/stamp.rustc_llvm' failed
make: *** [x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib/stamp.rustc_llvm] Error 101
make: *** Waiting for unfinished jobs....
note: keeping build directory ‘/private/var/folders/5d/pqjr3mqj0gqclvqx29wxzhfr0000gn/T/nix-build-rustc-1.4.0.drv-4’
builder for ‘/nix/store/akqi1g0783qpf18gjn463a13xc8iz4wd-rustc-1.4.0.drv’ failed with exit code 2
cannot build derivation ‘/nix/store/bhz2vwccya3mc0zxjvjpapzclk6dj3x9-rust-env.drv’: 1 dependencies couldn't be built
error: build of ‘/nix/store/bhz2vwccya3mc0zxjvjpapzclk6dj3x9-rust-env.drv’ failed

Here are the flags used to build rust:

configure flags: --prefix=/nix/store/0jjmq3629x5b7q5x88xaah83y59rc2q2-rustc-1.4.0 --release-channel=stable --enable-local-rust --local-rust-root=$snapshot --enable-rpath --default-linker=/nix/store/2bf6xr0v5mxlfx0lawgk6lcnw5dibk1a-clang-wrapper-3.6.2/bin/cc --default-ar=/nix/store/chh2vjk1i08fhfrmj2da38b0akcl1sgs-cctools-binutils-darwin/bin/ar --enable-clang --llvm-root=/nix/store/lzpl4l44nrcn3k1d9yl48jwhcylb71c6-llvm-3.7.0 --datadir=/nix/store/0jjmq3629x5b7q5x88xaah83y59rc2q2-rustc-1.4.0/share --infodir=/nix/store/0jjmq3629x5b7q5x88xaah83y59rc2q2-rustc-1.4.0/share/info

Is this an issue related to LD_LIBRARY_PATH and/or LIBRARY_PATH? My understanding is that nix uses a custom llvm. Has anyone built rust without the apple provided llvm?

[sanxiyn]

Closing as a duplicate of #34486, because that issue has more information. Thanks!