Why am I getting a linking error about the function defined in the S-function wrapper C file when building my model?
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I used a S-function Builder block to generate the S-function source code, TLC, and mex file for me. Then, I replace this S-function Builder block with a S-function block, giving it the name of the generated S-function.
Now, when I build the model, I got an error saying [mdl_name].obj : error LNK2019: unresolved external symbol [sfcnname]_Outputs_wrapper referenced in function [mdl_name]_step.
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MathWorks Support Team
2017-8-29
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The issue is caused by the fact that when the S-function Builder block is taken out, the model is losing information about what source files other than the [s-function name].c would be associated with the MEX file that is given to the S-function block.
In order to the S-function block to know where to look for the _wrapper.c, you need to explicitly tell it in the *S-function modules field of the S-function block. More information about this field can be found here:
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