bug#54728: Valgrind not working out of the box due to stripped ld.so

[Denis 'GNUtoo' Carikli]

On Thu, 07 Apr 2022 18:40:08 +0200
Ludovic Courtès <ludo@gnu.org> wrote:

> Hi,
Hi,

> Unfortunately, until that branch is merge (most likely a few months
> from now), we’ll have to use the workaround you mentioned.
> 
> Alternatively, maybe we could temporarily patch the ‘valgrind’ package
> such that it has ‘--extra-debuginfo-path=…’ by default.  Would you
> like to give it a try?
That is a good idea. As I need it anyway[1], I've actually worked on
doing that through patching Valgrind source code to use better defaults
than /usr/lib/debug but there is a couple of things I'm unsure with my
patch:
- First it works fine in 'guix shell -C' but it still fails
  in packages. Maybe I didn't patch the right Valgrind?

- Then for some reasons guix style messes up the whitespaces with the
  following command:
  $ ./pre-inst-env guix style -e \
    '(@@ (gnu packages valgrind) valgrind/interactive)';
  So I did the style by hand instead, so it might contain mistakes.

- And finally I'm not comfortable enough with Valgrind or how it's been
  used in Guix. As I understand from the comment in the first Valgrind
  being defined in valgrind.scm, it seems to be depended on by a lot of
  packages. In addition I've not looked why there is a
  valgrind/interactive or how it works yet, so someone would need to
  double check my patch carefuly.

I've attached a libsamsung-ipc.scm file as I used that for testing my
patch (in addition of just running Valgrind in a Guix shell container
and while building this package it fails.

I'll send the patch as a response to this mail.

References:
-----------
[1] At the end of the day I need it to work in both standalone mode and
    also in package builds as I use a guix.scm to run various
    compilation and runtime for libsamsung-ipc before pushing patches
    to the main branch.

Denis.

libsamsung-ipc.scm
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