Multiple definitions of the same function in generated code

I have a model where the interfaces are configured as GetSet. Corresponding header file is also added in port configuration. When code is generated, definition for these Get/Set functions are generated in <model>.c file. But there is also a headerfile, with same name as what is configured in the ports generated in instrumented folder inside ert_rtw. This causes multiple definition error when trying to run SIL. How do i avoid the extra header file from being generated. It is already present in my working directory and is added to custome code sttings in model config.

Answer 1

[sneha]

To avoid having Embedded Coder generate that extra header or duplicate files, you must adjust the storage class / code-generation settings so that the code generator assumes your external file covers the definitions and does not generate its own.

To fix it:

1. Set Data Scope to Imported for all signals using Get/Set.
2. This tells Embedded Coder to use your existing code instead of generating new ones.
3. In Model Settings → Code Generation → Custom Code, add your header (MyInterface.h) and source (MyInterface.c).
4. Make sure the build doesn’t include the auto-generated header from model_ert_rtw/instrumented/.
5. Rebuild and check the code generation report — only your header should appear.

Supporting MathWorks Docs:

https://www.mathworks.com/help/rtw/ug/choose-a-built-in-storage-class-for-controlling-data-representation-in-the-generated-code.html– use this to understand how to control how signals and parameters appear in generated code.

https://www.mathworks.com/help/ecoder/ug/design-custom-storage-classes-and-memory-sections.html– refer here to learn how to define and configure your own storage classes (e.g., Imported, Get/Set).

https://www.mathworks.com/help/ecoder/ug/getset-custom-storage-classes.html– check this for details on using Get/Set to access data through custom getter/setter functions and link external code.