Why do I receive unresolved symbol errors when trying to compile my MATLAB function using graphics?

I am trying to compile the following function:

function test_graphics_mcc( power )

x=-10:.1:10;
y=x.^power;
plot(x,y);
title(sprintf('x^%i',power));
xlabel('x');
ylabel('y');

I then compile it with the command:

mcc -t -L C -W libhg:test_graphics_mcclib -T link:lib test_graphics_mcc.m libmmfile.mlib libmwsglm.mlib

I receive the following errors: ERROR: test_graphics_mcc.obj .text: undefined reference to '_mlfNTitle' test_graphics_mcc.obj .text: undefined reference to '_mlfNXlabel' test_graphics_mcc.obj .text: undefined reference to '_mlfNYlabel'

   MBUILD.BAT: Error: Link of 'test_graphics_mcclib.dll' failed. 

 ??? Error using ==> mbuild
 Unable to complete successfully
 ??? Error: An error occurred while shelling out to mbuild (error code = 1).
 Unable to build executable (specify the -v option for more information).
 Error in ==> C:\MATLAB6p5\toolbox\compiler\mcc.dll

Answer 1

[MathWorks Support Team]

Using graphics in shared libraries is not supported.

The "-T link:lib" is what tells MCC to generate a shared library. You should generate only stand alone executables using graphics.

However, the actual error displayed is due to using Handle Graphics and a missing switch to MCC. Since you are using Handle Graphics, you need to use the "-B sgl" switch.

For more information, see:

https://www.mathworks.com/help/compiler/mcc.html

If you have already installed the help documentation for your licensed product(s), you may access the same page locally by typing the following at the MATLAB prompt:

web([docroot '/toolbox/compiler/mcc.html'])

From there:

 -B sgl (Stand-Alone C Graphics Library).   

 Produce a stand-alone C application that uses Handle Graphics. The -B sgl option is equivalent to the series of options -m -W mainhg libmwsglm.mlib

Here is the full command you should use:

mcc -B sgl -t -L C -W libhg:test_graphics_mcclib -T link:lib test_graphics_mcc.m libmmfile.mlib

However, remember that this is not supported, and you may run into other problems at a later time.