Could not exec the linker `cc` error when running “cargo build”

Question

I just installed Rust on my Mac and rustc --version --verbose displays

rustc 1.0.0-nightly (91bdf23f5 2         


        

Answer 1

It looks like you have installed GCC and LLVM/clang via Homebrew. Checking out the shared macOS configurations, the linker defaults to cc. I have installed the macOS developer tools:

$ clang --version
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

$ cc --version
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

This is potentially something that Rust itself could fix, but you'd have to file a bug report / enhancement request. It's possible that you might be able to work around this by symlinking clang as cc, instead of just aliasing it, as aliases probably don't exist in the environment that Rust is calling out from.