Microchip Technology SW006023-2N Data Sheet

®

DS51686E-page 54

 2012 Microchip Technology Inc.

This section demonstrates how to compile and link multiple C and C++ files in a single 
step.

File 1

/* main.cpp */

#include <xc.h>     // __XC_UART

#include <plib.h>   // SYSTEMConfigPerformance()

#include <iostream>

using namespace std;

// Device-Specific Configuration-bit settings

#pragma config FPLLMUL=MUL_20, FPLLIDIV=DIV_2, FPLLODIV=DIV_1, 

FWDTEN=OFF

#pragma config POSCMOD=HS, FNOSC=PRIPLL, FPBDIV=DIV_8

// add() must have C linkage

extern "C" {

extern unsigned int add(unsigned int a, unsigned int b);

}

int main(void) {

    int myvalue = 6;

    

    // Configure the target for max performance at 80 MHz.

    SYSTEMConfigPerformance (80000000UL);

    

    // Direct stdout to UART 1 for use with the simulator

    __XC_UART = 1;

    std::cout << "original value: " << myvalue << endl;

    myvalue = add (myvalue, 3);

    std::cout << "new value:      " << myvalue << endl;

    

    while(1);

}

File 2

/* ex3.c */

unsigned int

add(unsigned int a, unsigned int b)

{

  return(a+b);

}

Compile both files by typing the following at the prompt:

xc32-g++ -mprocessor=32MX795F512L -o ex3.elf main.cpp ex3.c

The command compiles the modules main.cpp and ex3.c. The compiled modules 
are linked with the compiler libraries for C++ and the executable file ex3.elf is cre-
ated. 

Use the xc32-g++ driver (as opposed to the xc32-gcc driver) in order to link 
the project with the C++ support libraries necessary for the C++ source file 
in the project.