Comment 0 for bug 1939293

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)

[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 test run (note the lines starting with "error:")

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)