GNU logs - #39503, boring messages

Message sent to mark@HIDDEN, bug-guix@HIDDEN:

Subject: bug#39503: Supporting elf-debuginfod (debug symbol server)
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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To: bug-Guix@HIDDEN
Cc: Mark Wielaard <mark@HIDDEN>
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Date: Sat, 08 Feb 2020 00:07:22 +0100
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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

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: bug#39503: Acknowledgement (Supporting elf-debuginfod (debug
 symbol server))
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Date: Fri, 07 Feb 2020 23:08:01 +0000

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39503: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D39503
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Message sent to bug-guix@HIDDEN:

Subject: bug#39503: Supporting elf-debuginfod (debug symbol server)
Resent-From: Mark Wielaard <mark@HIDDEN>
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Date: Sun, 9 Feb 2020 23:40:42 +0100
From: Mark Wielaard <mark@HIDDEN>
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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

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