Pierre Langlois <pierre.langlois@gmx.com> writes:

> [[PGP Signed Part:Undecided]]
> Hi Guix!
>
> Good news everyone, I managed to get a aarch64 build of Rust by updating
> mrustc to 0.10!  Sadly, i686 is still unsupported, due to the build
> using too much memory, it must be the same for other 32-bit architectures.
>
> I tested this on a pinebookpro which only has 4G of RAM, I had to attach
> 16G of swap for the initial rust@1.39 build to succeed, then the whole
> rust chain took about 5 days!  I also tested on my x86_64 desktop.
>
> Here's the patch! After it we should be able to follow-up and enable
> Gnome and friends.
>
> That being said, I wasn't entirely sure where this patch should go,
> ideally it would be good to have a staging branch rather than
> core-updates, WDYT?  Maybe we can do this along with a rust version
> update?
>
> PS: I also tried to build rust 1.54 with the new mrustc update, to
> shorten the chain, but I've not had any successes with it yet.
>
> [[End of PGP Signed Part]]
> From 555b3b21ead25d09b56e6287d5542da1abfb13c4 Mon Sep 17 00:00:00 2001
> From: Pierre Langlois <pierre.langlois@gmx.com>
> Date: Sat, 26 Mar 2022 13:21:17 +0000
> Subject: [PATCH] gnu: mrustc: Update to 0.10.
>
> And enable rust for aarch64-linux!
>
> * gnu/packages/rust.scm (%mrustc-commit): Update hash.
> (%mrustc-source): Update to 0.10.
> (rust-1.39)[arguments]: Move and adapt the substitute* that prevent
> fetching sources.  Patch /bin/sh in run_rustc/rustc_proxy.sh.
> [supported-systems]: Add aarch64-linux.
> ---
>  gnu/packages/rust.scm | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/gnu/packages/rust.scm b/gnu/packages/rust.scm
> index 26d6df7a94..7a841e4326 100644
> --- a/gnu/packages/rust.scm
> +++ b/gnu/packages/rust.scm
> @@ -124,9 +124,9 @@ (define* (rust-bootstrapped-package base-rust version checksum)
>  ;;; to be used in source form.  The latest support for bootstrapping from
>  ;;; 1.39.0 is not yet released so use the latest commit (see:
>  ;;; https://github.com/thepowersgang/mrustc/issues/185).

Oh, I forgot to adapt this comment, the last sentence can be removed now
there's a release.  Attached a fixed patch.