Ardour Log [Error]: LADSPA errors

[gregreen (Gregreenwood)]

When Ardour 5.12.0 starts in Ubuntu Studio everything is fine, but there is a blinking red indicator in the top right of the screen which when clicked shows:
[ERROR]: LADSPA: cannot load module “/usr/lib/ladspa/fmod_1656.so” (/usr/lib/ladspa/fmod_1656.so: undefined symbol: __expf_finite)
[ERROR]: LADSPA: cannot load module “/usr/lib/ladspa/autotalent.so” (/usr/lib/ladspa/autotalent.so: undefined symbol: __exp_finite)
[ERROR]: LADSPA: cannot load module “/usr/lib/ladspa/amp_1654.so” (/usr/lib/ladspa/amp_1654.so: undefined symbol: _expf_finite)
[WARNING]: Ignoring invalid LV2 plugin http://guitarix.sourceforge.net/plugins/gx_colwah#colwah

There is more but it is just information. I do not see any problems using Ardour but it is not clear how to stop the errors from happening or if there is anything broken in Ardour.

Help?

[x42 (Robin Gareus)]

Looks like Ubuntu Studio links those plugins against glibc 2.30 , and your runtime has 2.31.
The underlying issue is underlinking against libm.

see also

• Undefined symbol: __exp2f_finite
• https://sourceware.org/pipermail/libc-alpha/2020-May/113773.html
• A-compressor and others not available after upgrading
• https://github.com/pure-data/pure-data/issues/975

Solution is to re-compile those plugins and explicitly linking using -lm.