[Bug 1939293] [NEW] unable to load externals: undefined symbol "__pow_finite" and similar

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[Impact]

Pd-0.50.2-3 (as shipped with focal) is unable to load the external
objects (plugins) shipped in the "puredata-extra" package (which is
built from the same source package as "puredata" itself) due to a
problem with some symbols that should be provided by libm.

The missing symbols are `__exp_finite`, `__log_finite`, `__logf_finite` and `__pow_finite`.
The affected externals are:
- bonk~
- choice
- fiddle~
- sigmund~

The problem appears to come from a change in the symbols when upgrading
from glibc-2.30 to glibc-2.31 (e.g. see
https://sourceware.org/pipermail/libc-alpha/2020-May/113773.html)

A simple rebuild of the package seems to fix the problem.

To trigger a rebuild I've added a debdiff that bumps the version number
to "0.50.2-3build1~ubuntu20.04.1" (i hope this is the correct version
scheme for such an upload).


[Test Plan]

A quick way to check whether the objects can be loaded is by running
this script (after installing the "puredata-extra" package):

~~~
find /usr/lib/puredata/extra/*/ -name "*-help.pd" -exec pd -nrt -nogui -send "pd quit" {} ";"
~~~

I've attached the output of such a (failing) test run (note the lines
starting with "error:")


[Where problems could occur]
The rebuild apparently fixes the problem, although a more correct fix would probably be to add "-lm" to the linker-flags when building the plugins.
(This is what upstream did for the Pd-0.51 release).
In order to keep the impact of my patch minimal, i have chosen to just trigger a rebuild.


ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: puredata-extra 0.50.2-3
ProcVersionSignature: Ubuntu 5.4.0-80.90-generic 5.4.124
Uname: Linux 5.4.0-80-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
Date: Mon Aug  9 11:23:35 2021
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: puredata
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: puredata (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal patch uec-images
-- 
unable to load externals: undefined symbol "__pow_finite" and similar
https://bugs.launchpad.net/bugs/1939293
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