On 06/22/2018 05:37 AM, JP - Escarres wrote:
Hi everyone. I'm trying to make my DMX interface (Enttec OpenDMX USB) work with Pd. I read a lot of things about it, and probably the best way to make it work would be by using Open Lighting Architecture ( https://www.openlighting.org/ola/) I'd like to avoid using something like QLC if possible. I'm on Linux (Ubuntu).
I found this external http://puredata.info/Members/santi/ola2pd/ which seems to be perfect for me. I tried to follow all the steps (installing Ola, compiling Flext), but the object Ola2pd is not recognized by Pd. As they suggested, I tried to compile it myself by using Flext. It works, but still, the object Ola2pd is not recognized in pd. I received the message "undefined symbol: _ZTIN3ola6client17BaseClientWrapperE"
Any idea of what I could do?
well, the problem you are facing is, that (at least) one of the symbols that are supposedly provided by libola is missing.
so there's two possibilities:
- either you are not (properly) linking against libola
- or current version of libola does not provide that symbol any longer.
assuming the former (as the latter would require porting the external to the new libola), i see that the readme.txt has an explicit note on "compiling on ubuntu", that requires you to repeat the linker command with "-lflext-pd_t -lola" *after* the output file (ola.pd_linux) rather than before it (because doing it in the wrong order will make modern linkers skip the linking; this is actually a bug in the buildsystem).
even if you are not using ubuntu, most modern linkers will require that step.
fgmasrd IOhannes