I think it would be useful to add:

if env['platform'] == 'osx':
    arch_suffix = env['macos_arch']

Hi there !
I wonder why to make a difference for macos arch parameter ?
Arch is not dependant on the os. In a next future we can imagine having windows arm build.
Also engine build does not add platform specific arch argument : https://docs.godotengine.org/fr/stable/development/compiling/compiling_for_osx.html

At least the same architecture can be called by different names on different OSes. arm64 for Mac, arm64v8 for Android and so on.
Also on different OSes we have different special cases: fat binaries with multiply archs for Mac or iOS (we called it universal). As far as I know Windows or Android have no universal binaries (even in the same architecture class: for example x86 and x86_64 for Win)
So having many architectures may be justified.

At least the same architecture can be called by different names on different OSes. arm64 for Mac, arm64v8 for Android and so on.
Also on different OSes we have different special cases: fat binaries with multiply archs for Mac or iOS (we called it universal). As far as I know Windows or Android have no universal binaries (even in the same architecture class: for example x86 and x86_64 for Win)
So having many architectures may be justified.

This is a good reason Indeed :D

Hello, any update on this?

Thanks for the great work!

What's the difference with #584 ?
That PR from @Faless seems to do the same thing? (= Adding support for arm64)

What's the difference with #584 ?

It is the same as #584 and #587 combined.

It is the same as #584 and #587 combined.

Yeah, my bad, I didn't notice this PR at the time or I would have merged this instead of making a new one 😞