```ruby
require 'formula'

class ArmNoneEabiGcc < Formula

  homepage 'https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads'
  version '7-2018-q2-update'

  url 'https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-mac.tar.bz2'
  sha256 'c1c4af5226d52bd1b688cf1bd78f60eeea53b19fb337ef1df4380d752ba88759'

  def install
    (prefix/"gcc").install Dir["./*"]
    Dir.glob(prefix/"gcc/bin/*") { |file| bin.install_symlink file }
  end
end
```

Update ARM gcc to `8-2018-q4-major`
user
```ruby
require 'formula'

class ArmNoneEabiGcc < Formula

  homepage 'https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads'
  version '8-2018-q4-major'

  url 'https://armkeil.blob.core.windows.net/developer/Files/downloads/gnu-rm/8-2018q4/gcc-arm-none-eabi-8-2018-q4-major-mac.tar.bz2'
  sha256 '0b528ed24db9f0fa39e5efdae9bcfc56bf9e07555cb267c70ff3fee84ec98460'

  def install
    (prefix/"gcc").install Dir["./*"]
    Dir.glob(prefix/"gcc/bin/*") { |file| bin.install_symlink file }
  end
end
```
assistant