TMS320F28388D: How to add a C++ file to a C project

78Sys

Part Number: TMS320F28388D

I want to create a C++ project for the TMS320F28388D, but Code Composer gives no option for C++ project, so, instead, I created a C project and tried to add a C++ file (.cpp) to the C project using File | New |Source File and Code Composer added the .cpp file automatically inserting a file header at the top of the .cpp page with the file name, date created, and author.

I then added a simple function defined as int trial1(int m) to the .cpp file and tried to Build the project, and the project built successfully.

Next, I placed a prototype for the trial1() function in the main.c file (generated automatically by Code Composer), and the project built successfully.

But then I tried to add trial1() in main(), and the project would not build. I got this error message during linking:

undefined symbol trial 1 first referenced in file ./main.obj

error #10234-D: unresolved symbols remain

error #10010: errors encounterd during linking: myProject.out" not built.

It looks like the linker does not see the trial1() function in my .cpp file.

How do I get the linker do see the function in the .cpp file and link?

Thanks.

over 3 years ago

0 Krishna Allam over 3 years ago

TI__Expert 7985 points

Dear Sir/Madam,

Thanks for reaching out for help with your C/C++ project. As you know, C++ is an improvement over C, hence the C language should be treated as a subset of C++. Therefore it is better to create a C++ project and then add C files to it.

Please consult with the guidelines here: https://software-dl.ti.com/codegen/docs/tiarmclang/compiler_tools_user_guide/migration_guide/migrating_c_and_cpp_source/index.html

and here: https://software-dl.ti.com/ccs/esd/documents/users_guide/ccs_project-management.html to help you with your C/C++ projects.

Do not hesitate to reach out if you have additional questions.

Regards,

Krishna

0 78Sys over 3 years ago

Expert 1540 points

I found the answer:

To add a C++ file to a C project, just add the C++ file using File | New |Source File as I mentioned above, then for each function in the C++ file make a function prototype at the top of the page preceded by:

extern "C"

So for a function in the .cpp file called int trial1(int m) you place this corresponding prototype at the top of the .cpp file:

extern "C" int trial1(int);

Must use a capital "C".

Next, just place a corresponding standard header in the C file like this:

int trial1(int);

I then did the build and it worked.

I got the solution from this great web page:

https://isocpp.org/wiki/faq/mixing-c-and-cpp#call-cpp

0 78Sys over 3 years ago in reply to Krishna Allam

Expert 1540 points

As I said above, there is no option to create a C++ project, so I created the C project and added the C++ files; moreover, all the T.I. setup files (peripherals, PIE, etc.) are written in C.

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TMS320F28388D: How to add a C++ file to a C project