Conflict bewteen rtwtypes and tmwtypes

I'm testing the embedded coder app in Simulink. I have generated C code for a simple adder which takes two numbers and add them. I succesfully generated the C code for this simulink model, and now I'm trying to make it work in the S-function builder. When I build the code, the following errors appears:

line 1: rtwtypes.h:77:16: error: conflicting types for 'byte_T' typedef char_T byte_T;

line 2: tmwtypes.h:580:16: note: previous declaration of 'byte_T' was here typedef BYTE_T byte_T;

I understand that "byte_T" is being defined in two different header files. However, I don't know how to avoid this. The answer given in this question suggest to include the following lines of code:

#if defined(MATLAB_MEX_FILE)
    #include "tmwtypes.h"
    #include "simstruc_types.h"
    #else
    #include "rtwtypes.h"
    #endif

However, this lines of code are already included in the wrapper generated by the S-function builder. How could I avoid this clash between rtwtypes.h and tmwtypes.h?

[Felipe Herrera]

I found a workaround this problem. Basically, I commented the lines of the code in rtwtypes.h which were producing the problem. Personally, I don't like this solution too much as I would prefer something more automatized. However, I leave this here in case someone else face the same problem.

[Abhaya]

Hi Felipe, Could you share the C file and wrapper generated by S- function builder?

[Abhaya]

Hi Felipe,

I tried to reproduce the model, and here are the steps I followed:

1. I added two 'Constant' blocks as inputs and a 'Display' block as output.
2. I included an 'S-function Builder' block in the model.
3. I implemented the addition functionality in the 'S-function Builder' in the 'Editor' tab. Here’s the code I used:

void delS_Outputs_wrapper(const real_T *u0,
                          const real_T *u1,
                          real_T *y0)
{
    /* Output_BEGIN */
    /* This sample sets the output equal to the input */
    
    y0[0]=u0[0]+u1[0];

    /* Output_END */
}

The model works fine on my end.

I suspect that the error you're encountering may be related to the inclusion of the rtwtypes.h file. In the 'Editor' tab of the S-function Builder, if you have included 'rtwtypes.h' file, this could be causing the issue.