Cross compilation for Mobian

[Gumur]

As a heavy emacs user and early adopter of both the pinephone and the keyboard cover that I've ordered as soon as it was made available, I'd really like to get a build of the latest emacs tree (with PGTK and nativecomp patches, which should really help with both performance and mobile compatibility) going, especially with the keyboard on its way.

I have extensive experience with building emacs itself, both with and without the patches, for amd64. I have no idea how to setup a cross compiler toolchain to build a arm64 package for the pinephone on my amd64 server, though, especially with the gcc toolchain which is supposedly harder to setup for cross compilation.

I'm also looking to setup the whole thing as a repo with a weekly or daily build job, if the repo setup doesn't require too much maintenance, which I'd gladly share if anyone's interested.

Does anyone have any pointers?

Among others:

https://jensd.be/1126/linux/cross-compil...-or-ubuntu