Can MATLAB use prototype files to load shared C library if that library has dependencies?

I'm trying to use MATLAB's loadlibrary function to load a shared library that has dependencies on a Linux RHEL8 workstation using a prototype file.

>> loadlibrary(library_path,@libfuncprototype)

Error using loadlibrary

There was an error loading the libary

"/opt/Lib64/libfunc.so"

libsubfunc.so.5: cannot open shared object file: No such file or directory

Caused by:

Error using loaddefinedlibrary

libsubfunc.so.5: cannot open shared object file: No such file or directory

Both libfunc.so and libsubfunc.so.5 (not their real names but sufficient for explaining the issue) exist in /opt/Lib64. When I run:

system(ldd('/opt/Lib64/libfunc.so')

the return shows that dependent library libsubfunc.so.5 was found

I investigated setting LIB_LIBRARY_PATH and LIB_RUN_PATH prior to the loadlibrary command, but I still get the same result when running loadlibary.

Questions:

• Can MATLAB load shared libraries using prototype file if the libraries have dependencies?
• How do I tell MATLAB to search in the same directory as the library for dependencies?

[Walter Roberson]

Does setting LD_LIBRARY_PATH help ?

[Toni]

I used setenv within MATLAB to set LD_LIBRARY_PATH and confirmed it was set using getenv. However, when I used loadlib, I saw no difference, I still got the same error message.

Answer 1

[Toni]

With the LD_LIBRARY_PATH defined in the environment before starting up MATLAB, loadlibary is able to load libaries with dependencies.

As I previously noted, using setenv within MATLAB to define LD_LIBRARY_PATH has no effect. The loadlibrary function fails to find the dependent libaries in this case.