Compiling C and C++ together and automating with Gnu make
=========================================================

Public domain
********************************************************************************
### main.c

    #include <stdio.h>
    #include "reciprocal.hpp"

    int main (int argc, char **argv)
    {
            int i;
            i = atoi (argv[1]);
            printf ("The reciprocal of %d is %g \n", i, reciprocal(i));
            return 0;
    }

********************************************************************************
### reciprocal.cpp

    #include <cassert>
    #include "reciprocal.hpp"

    double reciprocal (int i) {
            // i should be none zero
            assert (i!=0);
            return 1.0/i;
    }

********************************************************************************
### reciprocal.hpp

    #ifdef __cplusplus
    extern "C" {
    #endif

    extern double reciprocal (int i);

    #ifdef __cplusplus
    }
    #endif

********************************************************************************
### manual compile

    gcc -c main.c
    g++ -c reciprocal.cpp
    g++ -o reciprocal main.o reciprocal.o

********************************************************************************
### Makefile
  
    reciprocal: main.o reciprocal.o
            g++ $(CFLAGS) -o reciprocal main.o reciprocal.o
    main.o: main.c reciprocal.hpp
            gcc $(CFLAGS) -c main.c
    reciprocal.o: reciprocal.cpp reciprocal.hpp
            g++ $(CFLAGS) -c reciprocal.cpp
    clean:
            rm -f *.o reciprocal

********************************************************************************
### Using make

    make
    make clean
    make CFLAGS=-O2
    make clean
    make CFLAGS=-g

********************************************************************************
_BY: Pejman Moghadam_  
_TAG: c, cpp, make_  
_DATE: 2011-05-28 14:50:39_