.so library example

#!/bin/bash

OUTDIR=./bin/Debug
mkdir -p ${OUTDIR}

CXX=clang++
CCARGS="-Ishared-object -Wall"
LIBRARY="-shared -fPIC"
LDFLAGS="-L${OUTDIR}"

echo "building shared object"

${CXX} ${CCARGS} "./shared-object/shared-object.cpp" ${LIBRARY} -o ${OUTDIR}/libshared-objects.so.1.20160226.0
cd ${OUTDIR}
ln -sfn libshared-objects.so.1.20160226.0 libshared-objects.so.1
ln -sfn libshared-objects.so.1 libshared-objects.so
cd ../..

echo "building first app"

${CXX} ${CCARGS} "./first-app/first-app.cpp" -lshared-objects ${LDFLAGS} -o ${OUTDIR}/first-app.exe

echo "building second app"

${CXX} ${CCARGS} "./second-app/second-app.cpp" -lshared-objects ${LDFLAGS} -o ${OUTDIR}/second-app.exe

Library API (./shared-object/shared-object.h):

#ifndef __SHARED_OBJECT_H__
#define __SHARED_OBJECT_H__

extern "C" int calc(int a, int b);

#endif

Library implementation (./shared-object/shared-object.cpp):

#include "shared-object.h"

int calc(int a, int b)
{
    return a+b;
}

First application (./first-app/first-app.cpp):

#include 
#include "shared-object.h"

using namespace std;

int main(int argc, char** argv)
{
    cout << "first-app " << calc (3,11) << endl;
    return 0;
}

Second application (./second-app/second-app.cpp):

#include 
#include "shared-object.h"

using namespace std;

int main(int argc, char** argv)
{
    cout << "second-app " << calc(2,5) << endl;
    return 0;
}