Error when building Simulink model with C mex S-function in RTW (R2010b)

Hello,

I'm trying to build a Simulink model containing a C mex S-function with RTW (R2010b), but get following error messages related to mex function calls:

myCode.obj .text: undefined reference to '_mxSetM_700'

myCode.obj .text: undefined reference to '_mxSetN_700'

myCode.obj .text: undefined reference to '_mexCallMATLAB'

myCode.obj .text: undefined reference to '_mxDestroyArray'

myCode.obj .text: undefined reference to '_mexGetVariablePtr'

myCode.obj .text: undefined reference to '_mxGetField_700'

gmake: * [../myCode.exe] Error 111

Do I need to specify extra files in the 'Custom Code' pane of the RTW Options? Any suggestions are very appreciated.

Many thanks in advance, Bert

[Kaustubha Govind]

Do these errors show up when building code generated using RTW? Calls to MEX libraries such as mxSetM, etc. should not exist in generated code typically. Is this an un-inlined S-function?

[Bert]

The S-function is a level 2 C S-function, compiled using mex. I tried with the standard lcc compiler, as well as with VS2008 Express edition. Both result in an S-function which runs correctly in Simulink during simulation. However, when I try compiling this simulation model with RTW, the errors show up and the process is aborted.

The C S-function is indeed not inlined.

Answer 1

[Kaustubha Govind]

Bert: You need to modify your S-function code and remove the calls to the mxArray libraries. These libraries only run in the MATLAB environment, and therefore cannot be used in generated code meant to run standalone (without MATLAB). If you absolutely need these calls for simulation, you may write a TLC (see Inlining S-functions to define the behavior in generate code.