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

Calling a C Function from Within C Code

When attempting to invoke a C function from C , the "extern "C" foo()" approach may encounter compilation issues with g . To circumvent this challenge and successfully execute the C function, the following approach can be employed:

1. Compile the C code separately, using the command:

gcc -c -o somecode.o somecode.c

2. Compile the C code separately, likewise:

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

3. Link both compiled objects together using the C linker:

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

4. To inform the C compiler of an incoming C header containing the C function declaration, begin your othercode.cpp file with the following code:

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

5. Ensure that your "somecode.h" file contains a declaration similar to:

#ifndef SOMECODE_H_
#define SOMECODE_H_

void foo();

#endif

Note that you can use a compiler of your choice, as long as you follow the principle of compiling the C and C code separately and linking them together afterward.

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