bug#26926: [PATCH] gnu: update Mes to 0.6.

[ludo@gnu.org (Ludovic Courtès)]

Hi Jan!

Jan Nieuwenhuizen <janneke@gnu.org> skribis:

> Mes 0.6 for Guix.  Nyacc is now unbundled.  Mescc works with vanilla
> Nyacc.  Mescc behaves more like a regular C compiler and now passes
> 33/55 tests of the tinycc test2 test suite.

Woow, really impressive progress.

> Mescc can also be used as a Nyacc C compiler backend for Guile (x86 only).

I got stuck in a meta-circular attempt to understand the meaning of this
sentence.  What does this mean in very explicit terms?  :-)

> From f84c29fa5947051033d022dcb02496d8f8e14d28 Mon Sep 17 00:00:00 2001
> From: Jan Nieuwenhuizen <janneke@gnu.org>
> Date: Sun, 14 May 2017 11:35:30 +0200
>
>
 ^ extra line :-)

> * gnu/packages/mes.scm (mes): Update to 0.6.

[...]

> +         ,@(if (or (equal? (%current-system) "x86_64-linux")
> +                   (equal? (%current-target-system) "x86_64-linux"))

Note that %current-system is a “system type” like “x86_64-linux”
whereas %current-target-system is a GNU triplet like
“x86_64-linux-pc-gnu”.  Thus, the second line should be

  (string-prefix? (%current-target-system) "x86_64-linux")

OK with this change!

I’ve added you as a member of the group on Savannah so you can push it
yourself.  :-)

Please read ‘HACKING’ for the details.  Before pushing, can you reply to
this message and sign your reply with the OpenPGP key that you’ll use
to sign commits?  Also please upload your OpenPGP key to Savannah.

Thank you!

Ludo’.