[bug#42888] [PATCH] gnu: rust: Fix install phase for non-x86_64 platforms.

[Pierre Langlois]

Hi Jakub,

Jakub Kądziołka writes:

> On Sun, Aug 16, 2020 at 03:42:38PM +0100, Pierre Langlois wrote:
>> 
>> Pierre Langlois writes:
>> 
>> > Hello Guix!
>> >
>> > In an optimistic attempt to eventually have Icecat on a Pinebook Pro, I
>> > thought I'd try and get rust building on aarch64. Here's a fix for the
>> > post-install phase that had an x86 triplet hardcoded. With this we're
>> > able to start off the bootstrap chain!
>> >
>> > That being said, each step takes ~5 hours on this machine so this is
>> > going to take a while :-), it's currently working on 1.23.
>> >
>> > So, I suppose this should go into either core-updates or staging? WDYT?
>> 
>> Whoops, I forgot the copyright line on that file.
>> 
>
> Pierre,
>
> thanks for your patch! I was working on a similar change before, but
> when I tried it, it failed even earlier in the bootstrap chain. It
> might've been QEMU weirdness, though, a la #42448.
>
>> @@ -612,9 +613,10 @@ jemalloc = \"" jemalloc "/lib/libjemalloc_pic.a" "\"
>>                         (cargo-out (assoc-ref outputs "cargo")))
>>                     (for-each
>>                       (lambda (file) (delete-manifest-file out file))
>> -                     '("install.log"
>> +                     `("install.log"
>>                         "manifest-rust-docs"
>> -                       "manifest-rust-std-x86_64-unknown-linux-gnu"
>> +                       ,,(string-append "manifest-rust-std-"
>> +                                        (nix-system->gnu-triplet-for-rust))
>>                         "manifest-rustc"))
>>                     (for-each
>>                       (lambda (file) (delete-manifest-file cargo-out file))
>
> If I understand the code correctly, this quasiquote is unnecessary, as
> the host-side code will evaluate to a string that can be inserted as-is,
> without another unquote on the build side.
>
> Fixing this would mean that the patch can go on master, since it would
> now only trigger rebuilds on architectures that are already broken.

Ooooh yeah, that'll be much better, I've attached a patch that does just
that. I can confirm it doesn't trigger a full rebuild, nice!

> I wish you best of luck on your quest for Rust on ARM boards. This has
> been a long-standing issue, and it'd be nice to have it fixed. Let me
> know if you need any help - I packaged the last few versions, so I got
> quite familiar with the various failure modes of the build process. I'm
> NieDzejkob on IRC, if you prefer.

haha, thanks :-), I haven't got very far with it yet, the build failed
at 1.23 with a test case failure. Something to do with receiving the
wrong signal on an expected crash. I'm optimistic though!

I don't have the build log around anymore, but we can see if the CI has
the same problem. I haven't spent much time investigating, instead
thinking I'm better off trying to get the patches that allow
bootstrapping from 1.29 working. I was planning on looking into that.

Otherwise we can skip any tests that don't pass and carry on, I suspect
it's normal behaviour on that platform and the tests need updating.  I
think aarch64 is officially supported now but it's probably quite
recent.

Thanks,
Pierre

0001-gnu-rust-Fix-install-phase-for-non-x86_64-platforms.patch
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