Linker error not related to Linker

 

This question already has an answer here:

  • What is the effect of extern “C” in C++? 12 answers
  • Combining C++ and C - how does #ifdef __cplusplus work? 3 answers

    • Your error occurs because of C++ type-safe linkage, which mangles function names. You need to tell the C++ compiler that the function() has C linkage: 

    extern "C" void function(void);

    However, if the same header should be used by both the C and C++ compilers, you normally do that by using 

    #ifdef __cplusplus
extern "C"
#endif
void function(void);

    for a single function declaration, or use 

    #ifdef __cplusplus
extern "C" {
#endif 

void function(void);
int  response(int arg);
…

#ifdef __cplusplus
}
#endif

    around a block of function declarations for functions with C linkage.

    You can also use your existing header in C, and in your C++ code, use: 

    extern "C" {
#include "header.h"
}
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