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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Help getting started debugging Emacs on macOS Sierra
Date: Fri, 11 Aug 2017 17:18:04 +0300
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To: Itai Berli <itai.berli@gmail.com>
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> From: Itai Berli <itai.berli@gmail.com>
> Date: Fri, 11 Aug 2017 16:17:12 +0300
> Cc: Emacs developers <emacs-devel@gnu.org>
> 
> And what is the difference between gdb and gud-gdb?

They invoke 2 different interfaces between Emacs and GDB.  Depending
on what version of GDB you have there, "M-x gdb" might not be the best
choice, because it needs GDB 7.0 or later.

There's also this comment in gdb-mi.el, which is what "M-x gdb" uses:

  ;;; macOS:

  ;; GDB in Emacs on macOS works best with FSF GDB as Apple have made
  ;; some changes to the version that they include as part of macOS.
  ;; This requires GDB version 7.0 or later as earlier versions do not
  ;; compile on macOS.