Make command for preprocessor flags

Hello everybody,

i have a Simulink subsystem in which there is an inlined s-function. I want to generate c/c++ code from this subsystem.

My target is ert.tlc with "Create Visual C/C++ Solution file for the Embedded Coder" option. During code generation, i want RTW to add a preprocessor flags (necessary for s-function) into Visual Studio Solution automatically. I think i should change make command. But how?