Why do I receive errors when I attempt to explicitly load generated shared libraries created from the MATLAB C/C++ Math Libraries on Linux?

Why do I receive errors when I attempt to explicitly load generated shared libraries created from the MATLAB C/C++ Math Libraries on Linux?

I have created a shared library using the MATLAB Compiler on Linux using MATLAB (for example, libhello.so). When I attempt to load this from standalone C-code using the DLOPEN function, I receive an error.

I use the following steps to compile the program:

1. I execute the following code:

mcc -t -W lib:libhello -T link:lib hello.m

gcc -o test main.c -ldl

2. I then receive the following error when executing the 'test':

 $ ./test

 libmwlapack: load error:

 /usr/local/src/matlab-6.1/bin/glnx86/atlas_PIII.so: 

 undefined symbol: ieeeck_

 libmwlapack: load error: /usr/local/src/matlab-6.1/bin/glnx86/lapack.so:

 undefined symbol: xerbla_

Answer 1

[MathWorks Support Team]

You are receiving this error because the loader on Linux is currently unable to resolve symbols that are required by an explicitly loaded dynamic link library.

As a work around, please call the functions in the shared library implicitly, as the following pseudocode indicates (do not use dlopen(..) to load the library at run time):

 #include "hello.h"

 void main()

 {

 mlfInitializeHello();

 //Make call to mlfHello(..)

 mlfTerminateHello();

 }

This way, you are directly linking against libhello.so.