GCC      Apple LLVM    MSVC
back end         GCC      LLVM             MSVC
c front end      gcc      clang           MSVC
c++ front end    g++      clang++       MSVC

$ clang++ --version
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.5.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin