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[José de Abreu <1939293@xxxxxxxxxxxxxxxxxx>]

just tested it here, 0.50.2-3 shows the bug, and the focal proposed
0.50.2-3ubuntu0.1 works fine. And thanks Iohannes, i saw some new users
with the problem, and to solve it we needed to teach people building
puredata from source, which is easy, but for newcomers isn't as easy as
just downloading the package! thank you!

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https://bugs.launchpad.net/bugs/1939293

Title:
  unable to load externals: undefined symbol "__pow_finite" and similar

Status in puredata package in Ubuntu:
  Fix Released
Status in puredata source package in Focal:
  Fix Committed

Bug description:
  [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)

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