How I installed GCC ARM on my Mac 10.9 Mac Book Pro

install and add gcc arm to PATH.sh

# Download the file manually from here https://launchpad.net/gcc-arm-embedded
# Note: `curl` command doesn't work
# I downloaded this one: "gcc-arm-none-eabi-4_7-2013q3-20130916-mac.tar.bz2"

# double click it to unzip it

# Make a place to install it to
mkdir /usr/local/gcc_arm

# Move the unzipped stuff there.
mv ~/Downloads/gcc-arm-none-eabi-4_7-2013q3 /usr/local/gcc_arm/

# Check out all the purdy binaries, you'll need to build firmware.
ls /usr/local/gcc_arm/gcc-arm-none-eabi-4_7-2013q3/bin/
# arm-none-eabi-addr2line		arm-none-eabi-gcc-4.7.4		arm-none-eabi-ld.bfd
# ...
# arm-none-eabi-gcc ...

# Peep your current PATH
echo $PATH
# /usr/local/heroku/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:<BLA BLA BLA>

# Change your PATH by appending the "bin" folder of the folder
# NOTE: You should also add this line to ~/.bashrc or ~/.bash_profile (in your home directory)
# so you don't have to remember to do this every time you want to compile firmware.
export PATH="$PATH:/usr/local/gcc_arm/gcc-arm-none-eabi-4_7-2013q3/bin/"

# Check to ensure the gcc-arm firmware compiler is available (so `make clean dependents all` will work.)
arm-none-eabi-gcc --version
# arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 4.7.4 20130913 (release) [ARM/embedded-4_7-branch revision 202601]

There are a number of solutions in this thread, but the official download from brew and ARM with :
brew cask install gcc-arm-embedded

is by far the simplest and easiest.

The correct command to install gcc-arm-embedded is: brew install homebrew/cask/gcc-arm-embedded

The install works great. However when it is done the compile is unusable due to MacOS security. Is there a way to bypass the new security in Catalina?

@curtisembedded open Security & Privacy, in the general tab allow gcc-arm-none-eabi to run

brew cask install gcc-arm-embedded

This works even in 2020. Nice one.

brew cask install gcc-arm-embedded
Works Fine in MacBook Pro 2020

brew install --cask gcc-arm-embedded

Had to use this one since I got the error Calling brew cask install is disabled!

Is this 32-bit only?

+1 to brew cask install gcc-arm-embedded. Thank you!

Works as expected on Mac M1 (cask installed from a Rosetta brew - i.e. arch was i386 to ensure placing in /usr/local/bin and not in /opt/homebrew/bin).

brew cask no more works after 2022.
Instead, use brew install gcc-arm-embedded --cask to install.
Thanks @jeremyheiler anyway.

thank you