From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Subject: Re: gold linker and collect2: fatal error: cannot find 'ld'
Date: Mon, 20 May 2019 17:35:29 +0200
Message-ID: <87k1elqgu6.fsf@gnu.org>
References: <20190317160616.cyv5z7lbsrvbajur@thebird.nl>
	<20190318152849.n3jzwrbyfd7fd3db@thebird.nl> <87lg109r2p.fsf@gnu.org>
	<87a7g6hakd.fsf@ambrevar.xyz> <87bm03x9is.fsf@ambrevar.xyz>
	<87o941w5zf.fsf@ambrevar.xyz> <871s0xvtim.fsf@ambrevar.xyz>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([209.51.188.92]:55040)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <ludo@gnu.org>) id 1hSkKB-0003yh-Sp
	for guix-devel@gnu.org; Mon, 20 May 2019 11:35:40 -0400
In-Reply-To: <871s0xvtim.fsf@ambrevar.xyz> (Pierre Neidhardt's message of
	"Fri, 17 May 2019 20:13:37 +0200")
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel/>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: "Guix-devel" <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
To: Pierre Neidhardt <mail@ambrevar.xyz>
Cc: guix-devel@gnu.org

Hi Pierre,

Pierre Neidhardt <mail@ambrevar.xyz> skribis:

> So it seems that the following change to make-ld-wrapper triggers a
> rebuild of the world on every "guix build".  Any idea why?  Ludo?

=E2=80=9CEverything=E2=80=9D depends on =E2=80=98ld-wrapper=E2=80=99 (see c=
ommencement.scm), so you have
to come up with changes that do not modify the default =E2=80=98ld-wrapper=
=E2=80=99.

>                              (ld  ,(if target
> -                                      `(string-append bin "/" ,target "-=
ld")
> -                                      '(string-append bin "/ld")))
> +                                      `(string-append bin "/" ,target "-=
" ,linker-name)
> +                                      `(string-append bin "/" ,linker-na=
me)))

In these two cases, you=E2=80=99re changing the generated code from:

  (string-append bin "/" =E2=80=A6 "-ld")
  (string-append bin "/ld")

to:

  (string-append bin "/" =E2=80=A6 "-" "ld")
  (string-append bin "/" "ld")

To avoid a rebuild, you=E2=80=99ll have to special-case =E2=80=9Cld=E2=80=
=9D such that the
generated code is unchanged.

HTH!

Ludo=E2=80=99.