Beginning in Real-Time Workshop Embedded Coder 5.1 (R2008a), ERT no longer generates "model_SetEventsForThisBaseStep" in model.c and model.h, and you should avoid using the function. The model event flags are now maintained by code in a model's generated example main program (ert_main.c). For more information, see Optimizing Task Scheduling for Multirate Multitasking Models on RTOS Targets in the Embedded Coder documentation.
If you want this function to be generated for compatibility reasons, replace the following line in ert.tlc or your custom system target file:
%assign InlineSetEventsForThisBaseRateFcn = TLC_TRUE
with
%assign InlineSetEventsForThisBaseRateFcn = TLC_FALSE
