This is related to the super annoying small popup you get on Intel Macs when JIT is enabled.

Check this thread for context: Popup appears for a fraction of a second whenever a mix task is run (verifying shm-id-F8BD8E...)

Disabling the JIT is a workaround to avoid the popup. A proper fix will come in OTP 27 which is I think due in May 2024.

@LostKobrakai @dimitarvp thank you as always! I read the changelog to identify that this isn’t wanted behavior but couldn’t find anything but maybe I was too tired

So, thanks a lot for solving this mystery for me

FYI, in OTP 27 can Allow explicit enabling the JIT on Intel Macs by bjorng · Pull Request #8219 · erlang/otp · GitHub, here are my steps to enable JIT for my macOS/intel case.

Step 1

brew uninstall --ignore-dependencies erlang

Step 2

brew edit erlang

Add --enable-jit option to configure

    args = %W[
      --enable-dynamic-ssl-lib
      --enable-jit
      --enable-hipe
      --enable-shared-zlib
      --enable-smp-support
      --enable-threads
      --enable-wx
      --with-odbc=#{Formula["unixodbc"].opt_prefix}
      --with-ssl=#{Formula["openssl@3"].opt_prefix}
      --without-javac
    ]

Step 3

export HOMEBREW_NO_INSTALL_FROM_API=1
brew install erlang --build-from-source

brew install ignores locally edited casks and formulae if
HOMEBREW_NO_INSTALL_FROM_API is not set, so we temporarily export the env argument, reinstall erlang via brew installer and my local erlang formulae file occurred conflict with the above edited "--enable-jit", resolve the conflict by rerun brew edit erlang and save it.

The above steps enable JIT for my case macOS Sonama(intel) with Erlang/OTP 27.2.1

➜  ~ erl -eval 'io:format("~p~n", [erlang:system_info(emu_flavor)]), halt().'
Erlang/OTP 27 [erts-15.2.1] [source] [64-bit] [smp:16:16] [ds:16:16:10] [async-threads:1] [jit:ns] [dtrace]

jit