How to Ensure Always Declaring Variables in Generated Code Regardless of Active Variants in Simulink

I am currently using Simulink for auto code generation and encountering a challenge with the conditional declaration of variables using #if preprocessor directives. In my project, variables are used differently across variants: for instance, variant 1 uses variables 'a' and 'b', whereas variant 2 uses only variable 'a'. However, the generated code uses #if preprocessor directives to conditionally declare these variables, which leads to some variables not being declared at all depending on the active variant.

I would like to ensure that all variables are always declared in the generated code, regardless of which variant is active. Could you please provide guidance on how to adjust the settings or modify the code generation process in Simulink to achieve this?

[Jaimin]

Hi @yoonyku yoo,

Could you please share your Simulink model? It would be helpful for reproducing the issue.

[Githin George]

I could see the following documentation on configuring variant parameters for C Code generation - Options to Represent Variant Parameters in Generated Code

Again this is specific to Variant Parameters and I suspect that setting the Variant Activation Time to "startup" might be of help.

It would also help if you could provide a dummy simulink model to reproduce the issue in case this doesn't work.