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Making External Code Language Compatible With Generated Code

If you need to integrate external C code with generated C++ code or vice versa, you must modify your external code to be language compatible with the generated code. Options for making the code language compatible include

• Writing or rewriting the legacy or custom code in the same language as the generated code.

• If the generated code is in C++ and your legacy or custom code is in C, for each C function, create a header file that prototypes the function, using the following format:

  #ifdef __cplusplus
  extern "C" {
  #endif
  int my_c_function_wrapper();
  #ifdef __cplusplus
  }
  #endif

  The prototype serves as a function wrapper. The value __cplusplus is defined if your compiler supports C++ code. The linkage specification extern "C" specifies C linkage with no name mangling.

• If the generated code is in C and your legacy or custom code is in C++, include an extern "C" linkage specification in each .cpp file. For example, the following shows a portion of C++ code in the file my_func.cpp:

  extern "C" {
  
  int my_cpp_function()
  {
    ...
  }
  }

Integration Options

Integrating External Code Using Model Configuration Parameters

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