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

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|10.1.0                      |11.0
           Severity|normal                      |enhancement
            Summary|Cannot bootstrap with Xcode |GCC support for Apple
                   |12 Beta on aarch64, macOS   |Silicon (Arm64) on macOS
                   |11.0/Darwin, Apple Silicon  |requested

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #5)
> I asked about this on the mailing lists here:
> https://gcc.gnu.org/pipermail/gcc/2020-June/232922.html
> Iain Sandoe and Mike Stump had some hints about how to proceed; cc-ing them

It requires more or less a complete port (the amount of work depending on how
divergent the ABI and/or ISA is/are from the ones currently supported by GCC). 
We haven't begun to poke at this seriously yet.

Using the assembler / linker from LLVM upstream or Xcode is presumably possible
(in the same way that we can for X86 and PPC).

As Andrew says, it's a (IMO very) significant undertaking;  to get a port into
GCC11 would require the work to be complete and accepted by ≈ Dec 2020. 
Ideally, someone would work on it full-time for their day job to achieve that
;)

(of course, that won't stop us trying - but you should set expectations
realistically - spare time work is unlikely to achieve GCC11)

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