How Can I Successfully Call a C Function from C Code?

Calling a C Function from C Code

When integrating C and C code, it's common to encounter the need to call a C function from within C . While extern "C" can be used, this approach may fail due to compilation issues with g .

An alternative solution involves compiling the C code separately as a C module (.o file) using gcc:

gcc -c -o somecode.o somecode.c

Next, compile the C code separately:

g++ -c -o othercode.o othercode.cpp

Finally, link the two compiled objects together using the C linker:

g++ -o yourprogram somecode.o othercode.o

To enable the C compiler to recognize the C function declaration, include the header file in othercode.cpp, wrapped in extern "C":

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

The header file somecode.h should contain a declaration for the C function:

#ifndef SOMECODE_H_
#define SOMECODE_H_

void foo();

#endif

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