bug#41994: Emacs on Apple ARM devices

[Alan Third]

On Fri, Aug 14, 2020 at 04:15:40PM +0200, Robert Pluim wrote:
> >>>>> On Fri, 14 Aug 2020 02:17:18 -0700, Stefan Kangas <stefan@marxist.se> 
> >>>>> said:
> 
>     Stefan> Roland Kaufmann <rlndkfmn+emacs@gmail.com> writes:
>     >> Code generation on Apple's ARM devices is mostly similar to MacOS, 
> except that
>     >> they expect a code signature section, which to avoid wasting too many 
> bytes, are
>     >> not aligned on page size as with code, but rather to nearest 16 bytes. 
> In
>     >> addition, the ARM compiler will also emit some relative pointer 
> relocation
>     >> records, which it seems can be safely ignored as sections aren't 
> rearranged.
>     >> 
>     >> This changeset implements those changes on the Mach-O dumper so that 
> Emacs can
>     >> be compiled for ARM devices. With the ongoing convergence between the 
> MacOS and
>     >> iOS platform, and the increasing importance of code-signing in later 
> MacOS
>     >> versions, I think it could be nice to mainline these changes.
>     >> 
>     >> Since these sections do not occur in current MacOS builds - otherwise 
> they would
>     >> generate errors for being unknown - the changes should not impact 
> existing
>     >> places where Emacs build, and it would not work on iOS without to 
> begin with.
>     >> 
>     >> Hat tip to Aaron Griffith for sharing his knowledge.
> 
>     Stefan> This series of patches was submitted 8 weeks ago, but never got a 
> reply
>     Stefan> at the time.
> 
>     Stefan> Could someone with more knowledge about this please help review 
> it?
> 
> Are these patches even still needed now that emacs-27 has a portable
> dumper?

That's what I was wondering (although to be honest I never even
noticed there were patches attached).

I suspect the patch to configure.ac might be needed even for the
pdumpder?
-- 
Alan Third