Bug#980963: dpkg: Please add ARC architecture

[Guillem Jover]

Hi!

On Sun, 2021-01-24 at 23:36:52 +0300, Alexey Brodkin wrote:
> Package: dpkg
> Version: 1.19.7ubuntu3-1~202101232134~ubuntu20.04.1
> Severity: wishlist
> Tags: patch

> ARC architecture seem to match requirements for being added to the dpkg
> (https://wiki.debian.org/Teams/Dpkg/FAQ#Q._Can_we_add_support_for_new_dpkg_architectures.3F):
> 
>  * GNU triplet is there since 2013,
>    see: https://git.savannah.gnu.org/cgit/config.git/commit/?id=986360de6e412cbed27dbe2dbfb64ddbd18e7370
>  * Binutils, GCC & uClibc support ARC for many years now,
>    glibc 2.32 finally gained ARC support, see https://lists.gnu.org/archive/html/info-gnu/2020-08/msg00002.html 

Sorry, didn't reply up to now due to the freeze, this not looking
ready yet (as glibc is not even in Debian), but mostly because it
slipped my mind, but that kind of blocks progress on your side.
So let's see. :)

Or, were you looking to get this included for bullseye? (I think this
would not qualify, but, I think we might have done exceptions in such
cases in the past.)

Is the ABI fully stabilized now?

> >From 96523e18473b56743bf2f7d308c2d786f337e52e Mon Sep 17 00:00:00 2001
> From: Alexey Brodkin <abrodkin at synopsys.com>
> Date: Sun, 24 Jan 2021 00:34:52 +0300
> Subject: [PATCH] Add ARC architecture

> diff --git a/data/cputable b/data/cputable
> index 9f2a8e0e4..114a66ecb 100644
> --- a/data/cputable
> +++ b/data/cputable
> @@ -20,6 +20,8 @@ i386		i686		(i[34567]86|pentium)	32	little
>  ia64		ia64		ia64			64	little
>  alpha		alpha		alpha.*			64	little
>  amd64		x86_64		(amd64|x86_64)		64	little
> +arc		arc		arc.*			32	little
> +arceb		arc		arceb.*			32	big
>  armeb		armeb		arm.*b			32	big
>  arm		arm		arm.*			32	little
>  arm64		aarch64		aarch64			64	little

This looked incorrect, as it ends up not being a bijective relation,
so the lines need to be swapped. The problem is that the comments do
not explain this nor the test suite checks. So I improved both with the
attached patches, which I'll commit into master once I open it up for
1.21.x.

Also just to make sure, the GNU triplets are:

  arc-linux-gnu
  arceb-linux-gnu

No ABI modifiers (stuff like “eabi”) for the libc part (“gnu“) right?

Thanks,
Guillem
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