Big Sur / M1 Mac support

[jnordberg]

Trying to install the toolchain using homebrew on a m1 mac results in:

eosio.cdt: The intel architecture is required for this software.
Error: An unsatisfied requirement failed this build.

Alternatively trying to install it using a separate brew install that's run under rosetta 2 results in:

Error: An exception occurred within a child process:
  RuntimeError: Error, only supporting binary packages at this time

And finally building from source results in:

ld: framework not found Foundation

[kj4ezj]

Thank you for reaching out! Unfortunately, EOSIO has never officially supported the ARM architecture.

Formal M1 support would not only require a working build targeting ARM, but also M1 support by all of our test infrastructure and an M1-based buildfleet to be built out. In particular, Anka (a docker-like type 2 hypervisor we use for macOS virtualization in our CI system) is a key vendor who has yet to add ARM/M1 support.

We are paying close attention to the adoption of ARM in PCs and datacenters by Apple, OEMs, chipmakers, and cloud providers.

[bogniq]

The ld: framework not found Foundation error is related with #1005

[aclark-b1]

Duplicate of EOSIO/eos#9849