FAQ 748: TargetLink: How to Generate Common *.h/.c Files Used in Several CGUs?

Question

I have a .c/.h file (let’s call it my_common_functions.c/h) which contains several functions and is shared across multiple CGUs (code generation units). I experience problems because multiple production code versions of this file are generated. A typical scenario for this is a Simulink library that contains multiple subsystems. Each of the subsystems has a TargetLink function block and the same module (my_common_functions) is specified.

When code for a CGU is generated, the CGU generates my_common_functions.c/h, which contains only the used functions of this CGU. This typically leads to none of the CGUs generating a complete my_common_functions.c/h.
Therefore, when building the application for the all CGUs, compiler and linker errors can occur.
How can I get a complete my_common_functions.c/h?

Answer