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bug#41994: Emacs on Apple ARM devices

From: Stefan Kangas
Subject: bug#41994: Emacs on Apple ARM devices
Date: Fri, 14 Aug 2020 02:17:18 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

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.

This series of patches was submitted 8 weeks ago, but never got a reply
at the time.

Could someone with more knowledge about this please help review it?

Best regards,
Stefan Kangas

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