Fixing GDB in Emacs on Mac OS 10.8 (Mountain Lion)

Getting a new GDB

With the update to Mountain Lion, Emacs can no longer correctly interact with gdb. The easiest way to solve this is to install a newer version of GDB.
First, you must install HomeBrew (https://github.com/mxcl/homebrew). HomeBrew is a package manager for OSX that installs programs from source (similar to ports on BSD). You can install HomeBrew by running
```
$ ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)"
```
Pay attention to what brew tells you. You may need to follow some additional instructions to get brew working. When in doubt, ask brew:
```
$ brew doctor
```

Install a newer gdb:

$ brew install https://raw.github.com/Homebrew/homebrew-dupes/master/gdb.rb

You're going to have to change your paths to make your machine prefer the newer gdb to the one that came preinstalled. Edit /etc/paths and make sure /usr/local/bin is at the top of the file (if not, remove it from elsewhere and put it on the first line)

Since gdb has to have more privilege than most programs to manipulate other running programs, it has to be signed.
Follow the instructions under "Creating a Certificate" at http://sourceware.org/gdb/wiki/BuildingOnDarwin#Creating_a_certificate. Call it gdb-cert.
Now run:
```
$ codesign -s gdb-cert gdb
```

Author: Rafe Kettler

Date: 2012-11-14 18:22:02 EST

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