ISU - Exercise 2

Exercise 2 Building C++ Programs for host 

Exercise 1:

In file hello.cpp:
//hello.cpp
#include<iostream>
using namespace std;
int main ()
{
cout<<"Hello World!"<<endl;
return 0;
}

In terminal:
g++ -o hello hello.cpp
./hello

Exercise 2:

File: Make file

¨

Exercise 3:

File: Make file

SOURCES=main.cpp part1.cpp part2.cpp
OBJECTS=${SOURCES:.cpp=.o}
EXECUTABLE=parts
CXX=g++

all: ${OBJECTS}
${CXX} -o ${EXECUTABLE} ${OBJECTS}

main.o: main.cpp
${CXX} -c $^

part1.o: part1.cpp part1.h
${CXX} -c $^

part2.o: part2.cpp part2.h
${CXX} -c $^

clean:
rm ${EXECUTABLE} ${OBJECTS}

help:
@echo all, clean, help

Screenshots:
Makefile

Terminal

Exercise 4:

How are the source files compiled to object files, what happens?

Make  automatically makes object (.o) files into source (.cpp) files.

Not all dependencies are handled by this approach, which?

Header (.h) files are not recognized by make, so if you change the header file make will not recompile the respective source files.

Why is this a problem?

This is a problem because the executable won't have the resent files.