MEX-file Error

[nmehlman]

I get a MEX error (shown below) when trying to use the RunMCRoom() function. Any idea what might be the cause?

[under-funk]

Today I discovered that Matlab versions above 2016b have problems resolving @loader_path and requires a slight modification on how to resolve dynamic library paths.

I am on macOS so the commands for linux is different (ldd instad of otool for example) but it seems that if you change the @loader_paths in the following command using the install_name_tool like indicated below (just for @loader_path ones) so that you get the second result with otool it seems to work in newer versions of Matlab.

I am just writing this down so that it might help some others since I was keeping two copies of Matlab until now to keep MCRoomSim running.

In the terminal in MCRoomSim folder:

otool MCRoomSim.mexmaci64 -L

MCRoomSim.mexmaci64:
@loader_path/libut.dylib (compatibility version 0.0.0, current version 0.0.0)
@loader_path/libmx.dylib (compatibility version 0.0.0, current version 0.0.0)
@loader_path/libmex.dylib (compatibility version 0.0.0, current version 0.0.0)
@loader_path/libmat.dylib (compatibility version 0.0.0, current version 0.0.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.9.0)
/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 832.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.0)

install_name_tool -change @loader_path/libut.dylib @rpath/libut.dylib MCRoomSim.mexmaci64
install_name_tool -change @loader_path/libmx.dylib @rpath/libmx.dylib MCRoomSim.mexmaci64
install_name_tool -change @loader_path/libmat.dylib @rpath/libmat.dylib MCRoomSim.mexmaci64
install_name_tool -change @loader_path/libmex.dylib @rpath/libmex.dylib MCRoomSim.mexmaci64

otool MCRoomSim.mexmaci64 -L

MCRoomSim.mexmaci64:
@rpath/libut.dylib (compatibility version 0.0.0, current version 0.0.0)
@rpath/libmx.dylib (compatibility version 0.0.0, current version 0.0.0)
@rpath/libmex.dylib (compatibility version 0.0.0, current version 0.0.0)
@rpath/libmat.dylib (compatibility version 0.0.0, current version 0.0.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.9.0)
/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 832.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.0)

Hope this helps,