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=> Installing dependencies for llvm: cmake

You have to install it with -with-clang option: $ brew install -with-clang llvm LDFLAGS="$LDFLAGS -L/usr/local/opt/llvm37/lib/llvm-3.7/lib" The formula also notes: To link to libc++, something like the following is required:ĬXXFLAGS="$CXXFLAGS -nostdinc++ -I/usr/local/opt/llvm37/lib/llvm-3.7/include/c++/v1" It is then available under: /usr/local/bin/clang++-3.7 Thus, to get a bottled clang++ 3.7 you have to install the llvm package from Homebrew Versions: $ brew tap homebrew/versions In addition to that: the llvm package is relatively old - currently it has llvm 3.6 - where 3.7 was released 6 months ago. The extra -with-clang yields a full package compile because there is only one prebuild ('bottled') llvm package available (without clang++). When installing it, you have to add -with-clang to the command line (e.g. The llvm package in Homebrew doesn't include clang++, by default. Thus, it is sufficient to build C++11/C++14 software with common dependencies like Boost (e.g. However, the clang that comes with recent XCode (which is available in CI environments like Travis-CI, Version 9 is the default, 10 available, too) isn't that outdated anymore as it used to be (Apple uses an fantasy version scheme for clang that doesn't match upstream clang version numbers but cmake detects e.g. LDFLAGS='-L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib' \īut this -with-toolchain induced build takes a very long time and is thus unsuitable in a continuous integration (CI) environment. One can build it via: brew install -with-toolchain llvmĪnd then use it via e.g.: $ PATH="/usr/local/opt/llvm/bin:$PATH" \ Thus, it isn't part of the prebuilt ('bottled') package.

The stock Homebrew llvm package still doesn't include clang/clang++, by default. As of 2018, the Homebrew Versions repository ('tap') is out of service.