CODEWITHSUNDEEP
c++gccg++iostream
Deekshith Anand
Deekshith Anand

Reputation: 2682

How to compile a c++ source file without passing it explicitly to the g++ compiler

I want to use a source file, say foo.cpp with other c++ projects. One way to do this is having a header file and providing the source file as command line arguments to g++. But I want to compile it once, store it somewhere, and use it simply by including the header file, just like we do with iostream where we don't include it as a build argument to g++.

I assume even if we build it as a custom library, still we need to provide the .object or equivalent file as an argument to g++ right? Whereas for iostream, its implementation is compiled and linked with our cpp file, although we don't mention it explicitly like g++ foo.cpp iostream.

For instance, consider this:

foo.h

#ifndef FOO_H
#define FOO_H

void disp();

#end

foo.cpp

#include<weiostream> 

void disp()
{
    std::cout<<"Hello World";
}

main.cpp

#include<iostream>
#include "foo.h" \* I just wnat this to be like iostream and not 
 providing it as command-line argument *\

int main()
{
    disp();
    return 0;
}

It may be pointless to do it for this small program, but I am curious regarding the larger concept! And I am curious if iostream header file simply contains definitions or some mechanism to call its implementation library g++?

Upvotes: 0

Views: 78

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