JModelica is refusing to load the file libhsl.so as a shared library, even though I have set the LD_LIBRARY_PATH variable:
Exception of type: OPTION_INVALID in file "../../../../Ipopt/src/Algorithm/IpAlgBuilder.cpp" at line 321: Exception message: Selected linear solver MA27 not available. Tried to obtain MA27 from shared library "libhsl.so", but the following error occured: libhsl.so: cannot open shared object file: No such file or directory
I have tried recompiling and rerunning JModelica in many ways.
I have set LD_LIBRARY_PATH appropriately.
I have run ldconfig.
Nothing seems to help.
How can I fix this?
As of revision 7885 of the JModelica trunk, JModelica egregiously violates the Principle of Least Astonishment.
JModelica suggest you use the script /usr/local/jmodelica/bin/jm_python.sh or what have you to run your JModelica code.
Digging inside of this script, we find the following line:
LD_LIBRARY_PATH=:/root/Ipopt-3.12.4/build/lib/:/usr/local/jmodelica/ThirdParty/Sundials/lib:/usr/local/jmodelica/ThirdParty/CasADi/lib \
Note that LD_LIBRARY_PATH is being overwritten, so it does not matter what you set it as!
Changing this line to:
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/root/Ipopt-3.12.4/build/lib/:/usr/local/jmodelica/ThirdParty/Sundials/lib:/usr/local/jmodelica/ThirdParty/CasADi/lib \
resolves the issues.
This was brought up as a user patch on JModelica's site here on 2015-05-03. A patch was submitted on circa Revision 8185 to fix the issue, but it continued to crop up for me on trunk after that.