By doing so you're telling the operating system that gdb is authorized to attach to other processes for debugging purposes. You need to create a certificate and sign gdb. You'll get an error message like 'please check gdb is codesigned'. The result should be gdb version 7 or higher. Open your terminal, and run the following command: You need xcode command line tools to install Homebrew. See a Stackoverflow discussion for instructions on how to install the command line tools regardless of whether you have Xcode installed. Xcode is quite a big install, so if you do not want to install it, you can get away with just installing the Xcode command line tools. Xcode is a free integrated development environment similar to Eclipse designed by Apple and mainly intended for iOS development or targeting the clang compiler. Homebrew requires that you have either Xcode or the Xcode command line tools installed on your Mac. Instead of having to download, configure, and install something yourself, all you need to do is run one command, and Homebrew will take care of the rest for you. It's like Ubuntu's apt-get, where one can install packages easily from repositories. Homebrew 'installs the stuff that you need that Apple don't'. When you follow it, ignore anything about installing Ruby that is, stop after setting up git. If you want an additional guide on all of the following steps (except for installing GCC), the one by Moncef Belyamani is quite helpful. We'll be installing GCC 4.8.1 and GDB through a tool called Homebrew. This section is intended to get you quickly started with C++ programming on your Mac.

How to install c compiler in mac