将 C 与 C++ 联系起来

Question

I have a open source C project and if I try to execute examples it is working fine but if i try to call those functions from C++ by using extern (including all headers with function definition) it is throwing error undefined reference to function_name. Can someone help me out how to properly wrap the C code using C++ and calling functions directly from C++ by just including headers of C?

Answer 1

You need extern "C" language linkage to declare C functions in your C++ code.

This (among other things) prevents the name mangling otherwise used by the C++ compiler for functions.

Commonly extern "C" is added using conditional compilation in header files by checking the existence of the __cplusplus macro:

#ifdef __cplusplus
extern "C" {
#endif

// Function declarations

#ifdef __cplusplus
} // End of the extern "C" block
#endif