Posted by dautrevaux on 2020-07-08 10:37

Hi,

You can either convert your existing C project to C++ (by right click on project then “Convert to C++”), or create a new project by choosing “C++ project” instead of “C project”.

However a C++ project is also a C project and the default main.c is still a C file (as are also the ST-provided libraries); you can just rename it as main.cpp (and correct it as it may not be a valid C++ file if you added incompatible C code). You can also include new C++ files in your project and they will be compiled by the C++ compiler; however, don’t forget to declare the functions that must be called from C code as extern "C"

The main difference is that the linker will use the C++ linker, even if you only include C files; note that if your C++ code must include C-compatible header files, these must, typically in a #ifdef c_plusplus section declare all C functions as extern "C".

For example you can start your C header files by

#ifdef c_plusplus
extern "C" {
#endif

#ifdef c_plusplus
};
#endif

HTH

Bernard (Ac6)

Posted by user9 on 2020-07-08 11:39

Thanks Bernard for your answer. It is very helpful.
I cannot know if it works yet because I think I first have to fix my external library issue. I’ll post another question in the forum about it.