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Re: librsvg & Rust

From: Marius Bakke
Subject: Re: librsvg & Rust
Date: Fri, 15 Mar 2019 14:39:01 +0100
User-agent: Notmuch/0.28.2 ( Emacs/26.1 (x86_64-pc-linux-gnu)

Ludovic Courtès <address@hidden> writes:

>>> Also, is the new librsvg API-compatible with the old one?  IIUC it still
>>> provides a C API, right?  Does guile-rsvg still work, for example?
>> I have not noticed any regressions since the switch.  The guile-rsvg
>> tests pass, at least!
> One test would be to do ‘guix system vm-image --full-boot’ or something,
> to generate the derivation that builds the GRUB background image, which
> uses Guile-RSVG.

OK, good to know.  The background image is fine (I'm using this branch
on real hardware).

>>> What do other distros do?  Debian kept ‘librsvg-c’ around, primarily so
>>> that architectures where Rust isn’t supported yet could still work:
>>> <>.
>> I wanted to ask about this: is Rust supported on all the platforms we
>> support at the moment?
> According to Efraim and Danny, we have a problem at the moment.
> Presumably that can be worked around?

Right, Rust currently only works on x86_64.  In order to get this branch
started, let us either:

* Revert back to 2.40.20, or
* Conditionally use the new version on supported platforms

For the latter, I imagine something along the lines of...

(define-public librsvg
  (if (string-prefix? "x86_64" (or (%current-target-system)


>> While depending on Rust for GTK/GNOME is unfortunate, I do think it's
>> inevitable.
> Yeah.
>> By the way, the next version of librsvg will require Rust 1.33 or
>> thereabouts.
> Oh so we’re lagging already?

I was referring to the 2.46 series, but indeed 2.44.13 also fails with
Rust 1.27 (we're at 2.44.12).

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