Ludovic Courtès <ludo@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at submit) by debbugs.gnu.org; 9 Feb 2020 22:41:05 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun Feb 09 17:41:05 2020 Received: from localhost ([127.0.0.1]:53359 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1j0vGD-000177-E8 for submit <at> debbugs.gnu.org; Sun, 09 Feb 2020 17:41:05 -0500 Received: from lists.gnu.org ([209.51.188.17]:43571) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <mark@HIDDEN>) id 1j0vGB-00016z-P5 for submit <at> debbugs.gnu.org; Sun, 09 Feb 2020 17:41:04 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:49728) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from <mark@HIDDEN>) id 1j0vGA-00062x-Gf for bug-Guix@HIDDEN; Sun, 09 Feb 2020 17:41:03 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: * X-Spam-Status: No, score=1.2 required=5.0 tests=BAYES_50,KHOP_HELO_FCRDNS, URIBL_BLOCKED autolearn=disabled version=3.3.2 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <mark@HIDDEN>) id 1j0vG9-0007KF-3R for bug-Guix@HIDDEN; Sun, 09 Feb 2020 17:41:02 -0500 Received: from wildebeest.demon.nl ([212.238.236.112]:49460 helo=gnu.wildebeest.org) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from <mark@HIDDEN>) id 1j0vG8-0007Gw-TD; Sun, 09 Feb 2020 17:41:01 -0500 Received: from librem (deer0x15.wildebeest.org [172.31.17.151]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by gnu.wildebeest.org (Postfix) with ESMTPSA id 5B432300074D; Sun, 9 Feb 2020 23:40:58 +0100 (CET) Received: by librem (Postfix, from userid 1000) id C2FD9C3EE9; Sun, 9 Feb 2020 23:40:42 +0100 (CET) Date: Sun, 9 Feb 2020 23:40:42 +0100 From: Mark Wielaard <mark@HIDDEN> To: Ludovic =?iso-8859-1?Q?Court=E8s?= <ludo@HIDDEN> Subject: Re: bug#39503: Supporting elf-debuginfod (debug symbol server) Message-ID: <20200209224042.GB40455@HIDDEN> References: <87imkiyp1x.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <87imkiyp1x.fsf@HIDDEN> User-Agent: Mutt/1.10.1 (2018-07-13) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 212.238.236.112 X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: submit Cc: bug-Guix@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Hi Ludo, On Sat, Feb 08, 2020 at 12:07:22AM +0100, Ludovic Court=C3=A8s wrote: > I=E2=80=99ve just watched Mark=E2=80=99s very nice talk about debuginfo= d and and I=E2=80=99d > like to work towards running an instance of it on ci.guix.gnu.org: >=20 > https://fosdem.org/2020/schedule/event/debugging_debuginfod/ Glad you liked it. > What=E2=80=99s missing today is configuring GCC with =E2=80=98--enable-= linker-build-id=E2=80=99 > (which is not the default, unlike what Mark says in the talk :-)). It indeed isn't, I just believed it was because almost all distros enable it by default, except for Guix :) > If we do that, I wonder if we can stop using =E2=80=98.gnu_debuglink=E2= =80=99 (see the > =E2=80=98strip=E2=80=99 phase in (guix build gnu-build-system)). debug consumers still need a way to resolve the build-ids. The debuginfod-client is one (new) way of doing it. But it will take some time to add support to everything. Traditionally a debug file for a build-id is resolved though the file system. That is a symlink under /usr/lib/debug/.build-id/xx/yyyyy.debug that points to the actual debug file. It is normally installed by the debuginfo package. For guix some alternative location should be found and the debug consumers should be patched to look there (if you want to get rid of .gnu_debuglink). > Also, I suspect build IDs wouldn=E2=80=99t mesh well with grafting: unl= ess we > rewrite them, the same build ID would match both the ungrafted and the > grafted variant. Is that a problem? Not sure. (Currently (guix build > debug-link) recomputes =E2=80=98.gnu_debuglink=E2=80=99 upon grafting s= o that the links > remain valid.) I don't understand grafting yet. But if it is a different build, then it needs a new/unique build-id. > PS: I found Eelco Dolstra=E2=80=99s dwarffs to be very smart, too! > https://github.com/edolstra/dwarffs After the talk I also learned about: https://docs.01.org/clearlinux/latest/guides/clear/debug.html
bug-guix@HIDDEN:bug#39503; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: bug-Guix@HIDDEN
Subject: Supporting elf-debuginfod (debug symbol server)
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Hello Guix!
I=E2=80=99ve just watched Mark=E2=80=99s very nice talk about debuginfod an=
d and I=E2=80=99d
like to work towards running an instance of it on ci.guix.gnu.org:
https://fosdem.org/2020/schedule/event/debugging_debuginfod/
What=E2=80=99s missing today is configuring GCC with =E2=80=98--enable-link=
er-build-id=E2=80=99
(which is not the default, unlike what Mark says in the talk :-)).
If we do that, I wonder if we can stop using =E2=80=98.gnu_debuglink=E2=80=
=99 (see the
=E2=80=98strip=E2=80=99 phase in (guix build gnu-build-system)).
Also, I suspect build IDs wouldn=E2=80=99t mesh well with grafting: unless =
we
rewrite them, the same build ID would match both the ungrafted and the
grafted variant. Is that a problem? Not sure. (Currently (guix build
debug-link) recomputes =E2=80=98.gnu_debuglink=E2=80=99 upon grafting so th=
at the links
remain valid.)
Thoughts?
Thanks,
Ludo=E2=80=99.
PS: I found Eelco Dolstra=E2=80=99s dwarffs to be very smart, too!
https://github.com/edolstra/dwarffs
Ludovic Courtès <ludo@HIDDEN>:mark@HIDDEN, bug-guix@HIDDEN.
Full text available.mark@HIDDEN, bug-guix@HIDDEN:bug#39503; Package guix.
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