GNU bug report logs - #19973
Grafts break debug outputs

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: tracker <at> debbugs.gnu.org
Subject: bug#19973: closed (Grafts break debug outputs)
Date: Fri, 24 Aug 2018 16:09:01 +0000

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Your message dated Fri, 24 Aug 2018 18:08:38 +0200
with message-id <87k1oflpbt.fsf <at> gnu.org>
and subject line Re: bug#19973: Grafts break debug outputs
has caused the debbugs.gnu.org bug report #19973,
regarding Grafts break debug outputs
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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19973: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19973
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From: Mark H Weaver <mhw <at> netris.org>
To: bug-guix <at> gnu.org
Subject: Grafts break debug outputs
Date: Sun, 01 Mar 2015 00:06:11 -0500

Grafts break debug outputs, or at least that's my guess.
Here's what I see:

mhw <at> jojen:~$ guix build guile
guix build: warning: ambiguous package specification `guile'
guix build: warning: choosing guile-2.0.11 from gnu/packages/guile.scm:110:2
/gnu/store/3lhr8q28q6f59774di9av7ncy09jd55d-guile-2.0.11
/gnu/store/rgv3fvy6xqp6966rfh8v6fv7m48abcbh-guile-2.0.11-debug
mhw <at> jojen:~$ guix package -I guile
guile	2.0.11	out	/gnu/store/3lhr8q28q6f59774di9av7ncy09jd55d-guile-2.0.11
guile	2.0.11	debug	/gnu/store/rgv3fvy6xqp6966rfh8v6fv7m48abcbh-guile-2.0.11-debug
mhw <at> jojen:~$ ls -l .guix-profile/lib/debug/gnu/store/
total 8
lrwxrwxrwx 12 root guixbuild 128 Dec 31  1969 122jv790mv2mlnylbrbzav65vghbw93n-guile-2.0.11 -> /gnu/store/rgv3fvy6xqp6966rfh8v6fv7m48abcbh-guile-2.0.11-debug/lib/debug/gnu/store/122jv790mv2mlnylbrbzav65vghbw93n-guile-2.0.11
lrwxrwxrwx 15 root guixbuild 127 Dec 31  1969 3g20rdmnavpblsmgppyl8jhg67nidhjk-glibc-2.20 -> /gnu/store/hrny2whqg9c3m0klyfpbmmcyiir9yf8m-gcc-toolchain-4.9.2/lib/debug/gnu/store/3g20rdmnavpblsmgppyl8jhg67nidhjk-glibc-2.20

I guess GDB can't find the debugging information because
122jv790mv2mlnylbrbzav65vghbw93n-guile-2.0.11 is the name of the guile
directory *before* grafting.

To work around this, I created my own ~/mydebug directory:

mhw <at> jojen:~/mydebug/gnu/store$ ln -s /gnu/store/rgv3fvy6xqp6966rfh8v6fv7m48abcbh-guile-2.0.11-debug/lib/debug/gnu/store/122jv790mv2mlnylbrbzav65vghbw93n-guile-2.0.11 3lhr8q28q6f59774di9av7ncy09jd55d-guile-2.0.11

and then pointed GDB at ~/mydebug and then debugging works again.

      Mark

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From: ludo <at> gnu.org (Ludovic Courtès)
To: Mark H Weaver <mhw <at> netris.org>
Cc: Timothy Sample <samplet <at> ngyro.com>, 19973-done <at> debbugs.gnu.org
Subject: Re: bug#19973: Grafts break debug outputs
Date: Fri, 24 Aug 2018 18:08:38 +0200

Hello,

ludo <at> gnu.org (Ludovic Courtès) skribis:

> The patches below address this by adding code to update the CRC in the
> ‘.gnu_debuglink’ section upon grafting.  It uses a simple hook
> mechanism, a simplified version of what Timothy proposed.
>
> The ‘.gnu_debuglink’ hook does nothing for packages that lack a “debug”
> output.  For packages that have a “debug” output, only ELF files from
> bin/, lib/, etc. are considered.  Overall the run-time cost should be
> low.

I went ahead and pushed these two patches as
93c333895a4e2dc9baabec8ade60d9d2ac0a91e2 and
e4297aa8b95cefa32e2595ce58886fc03b0561f7.

I modified tests/debug-link.scm compared to what I posted such that it
would skip tests that require %bootstrap-gcc when networking is lacking.

Thanks for your feedback,
Ludo’.

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