➜  build git:(master) ✗ brew install cmake llvm@7
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> New Formulae
spirv-cross
==> Updated Formulae
annie                         librsvg                       openconnect                   postgresql@9.5                postgresql@9.6                pyside                        qt

Warning: cmake 3.13.4 is already installed and up-to-date
To reinstall 3.13.4, run `brew reinstall cmake`
Warning: llvm 7.0.1 is already installed and up-to-date
To reinstall 7.0.1, run `brew reinstall llvm`
➜  build git:(master) ✗ brew outdated llvm@7 || brew upgrade llvm@7
➜  build git:(master) ✗ cmake .. -DCMAKE_PREFIX_PATH=/usr/local/opt/llvm@7/
Configuring zig version 0.3.0+356cfa08
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/john.schmidt/repos/zig/build
➜  build git:(master) ✗ make install
[  0%] Built target embedded_blake
[ 16%] Built target embedded_lld_lib
[ 64%] Built target embedded_softfloat
[ 68%] Built target embedded_lld_wasm
[ 69%] Building CXX object CMakeFiles/zig_cpp.dir/src/zig_clang.cpp.o
In file included from /Users/john.schmidt/repos/zig/src/zig_clang.cpp:35:
/Users/john.schmidt/repos/zig/src/zig_clang.h:243:37: error: 'ZigClangSourceManager_getSpellingLoc' has C-linkage specified, but returns user-defined type 'clang::SourceLocation' which is incompatible with C
      [-Werror,-Wreturn-type-c-linkage]
ZIG_EXTERN_C ZigClangSourceLocation ZigClangSourceManager_getSpellingLoc(const ZigClangSourceManager *,
                                    ^
/Users/john.schmidt/repos/zig/src/zig_clang.cpp:147:81: error: static_assert with no message is a C++17 extension [-Werror,-Wc++17-extensions]
static_assert(sizeof(ZigClangABISourceLocation) == sizeof(clang::SourceLocation));
                                                                                ^
                                                                                , ""
2 errors generated.
make[2]: *** [CMakeFiles/zig_cpp.dir/src/zig_clang.cpp.o] Error 1
make[1]: *** [CMakeFiles/zig_cpp.dir/all] Error 2
make: *** [all] Error 2