I just checked and it still supports --HEAD as an option. The other options do seem to be gone, but it looks like it builds with --with-cocoa --with-modules --with-libsvg, though it would be necessary to look at the details of the recipe to confirm. I would expect it is built with the same options as the binary cask version.
Tim Cross <theophilusx@gmail.com> writes:
> If you go with the vanilla emacs homebrew recipe, you can add a command
> line option to have it build from the current repo HEAD. This is not a
> bad option if you want to run latest bleeding edge. I don't tend to do
> that because I prefer the stability of a released version when on the
> mac.
Just a FYI, as of two years ago it appears that Homebrew's vanilla emacs
formula hard codes --without-ns and does not support --HEAD. See
https://github.com/Homebrew/homebrew-core/pull/36070
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