How to Successfully Call a C Function from C Code?

Call C Function from C Code

Calling a C function from C can present challenges, especially if the "extern "C" void foo()" approach fails due to compilation issues with g . To address this, a different strategy is proposed:

Compilation:

1. Compile the C code:

   gcc -c -o somecode.o somecode.c

2. Compile the C code:

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

Linking:

Link the compiled files together using the C linker:

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

Header Inclusion:

To inform the C compiler that a C header is included, update the othercode.cpp file with the following:

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

somecode.h Header File:

Create a header file (somecode.h) to declare the C function:

#ifndef SOMECODE_H_
#define SOMECODE_H_

void foo();

#endif

Note:

This method separates compilation into C and C stages, followed by linking. The choice of compiler (gcc in this example) is flexible, but the principle remains the same.

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