[Bug bootstrap/96168] Cannot bootstrap with Xcode 12 Beta on aarch64, macOS 11.0/Darwin, Apple Silicon

[gcczilla at cpellegrino dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96168

--- Comment #1 from Claudia Pellegrino <gcczilla at cpellegrino dot de> ---
For those who want to run the shell script out of the box without any
modifications, the following requirements apply:

- You’re on Apple Silicon hardware.

- You’re running macOS 11.0 Beta 1 or newer.

- The gcc 10.1.0 source tarball has been extracted into a `gcc-10.1.0`
subdirectory of the current working directory.

- Homebrew is installed and works.

The Homebrew requirement is just for convenience; the attached shell script
installs gcc’s dependencies for you, including GNU make.
For in-detail guidance how to install Homebrew, consult https://brew.sh and
https://github.com/Homebrew/brew/issues/7857. Alternatively, install the
dependencies on your own but be aware that patches are needed for Apple
Silicon, which the Homebrew formulae already include.