What is the proper way to use brew's clang(++)?

[eleanordoesntcode]

Output of brew config

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Output of brew doctor

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Description of issue

The question is in the title. I've got a formula that I'm currently rewriting for the new version of the software (ProjectM). I've realised that Apple's clang++ (which is on version 16) is too old for some features used, but by using Homebrew's clang++ (version 19.1.3), it worked. I'm now asking myself: what would be the proper way of explicitely requiring this compiler for the build, properly? As a sidenote: the build process uses cmake.

[p-linnane]

depends_on "llvm" => :build

[eleanordoesntcode]

Thanks! Wasn't sure whether this would use it in the build, since llvm is keg-only iirc.

[Bo98]

Adding ENV.llvm_clang to the start of your build will make it prioritise LLVM Clang, e.g. https://github.com/Homebrew/homebrew-core/blob/3f3347f2ed06e0716917c776e07defddde4fbef2/Formula/c/c-blosc2.rb#L31.