CODEWITHSUNDEEP
c++makefilelinkersdlcodeblocks
user3820248
user3820248

Reputation: 84

Code::Blocks is not making object files

First of all, I am a beginner programmer so, please give simple answers that are understandable.

I am suing Code::Blocks and I am trying to make a multiple file project in C++. I am using SDL2. My problem is that when I put all my codes and functions altogether, they run and when I seperate them, they don't. This is because the execution file requires object files to be built which it don't get. It don't get them because compiler don't form them. In other words, there are problems with linking. The compiler simply, said that there are not ".o" files. These files are in the project as "Link Files" and not "Compile Files". And when I make them "Compile Files" as well as "Link Files", they produces errors that various variables inside the file where I mentioned them, are not declared. But when I include that file in the file using the variables, it gets deeply nested.

Following are the two ways:

First way which is not working, with seperate files.

In main.cpp:

    #include <SDL.h>
    #include <other.h>

    int var;
    int linkVar;
    int link1Var;
    int link2Var;

    #include "link.cpp"
    #include "link1.cpp"
    #include "link2.cpp"

    int main( int argc, char* args[] )
    {
      linkFunc();
      link1Func();
      link2Func();
    }

In link.cpp/ link1.cpp/ link2.cpp:

    void linkFunc()/void link1Func()/void link2Func() //Just a reference
    {
      //Code associated with var, link1Var, link2Var and link3Var.
    }

Second way which is working, with all functions in a single file.

First thing is that I don't want to learn makefile thing. If there is any other way to solve it then be it!

Upvotes: 2

Views: 3485

Answers (2)

Jonny D
Jonny D

Reputation: 2344

Code::Blocks makes object files for each file that it compiles as separate compilation units. It will compile and link together any files that are part of the project which it identifies as a source file.

First, remove your #includes of the cpp files. Then try the Project > Add files... menu option to add those other cpp files to the project.

Upvotes: 1

Ravid Goldenberg
Ravid Goldenberg

Reputation: 2299

First of all, you should not use #include on other cpp files, you can read about it here: include cpp

Secondly when you are trying to compile a project composed of separate files you should use the g++ command like this: g++ main.cpp link.cpp link2.cpp etc' you can read a basic explanation about it here: use the g++ command

To do exactly what you asked you should do:

# get rid of including any cpp files

# use forward declerations on any function belonging in other cpp files, before your main function like this:

void linkfunc();
void linkfunc2();
etc
.
.
. 
int main()
{
}

# specify the direct path to your .h files like this:

#include <C:/MinGW/SDL2/SDL.h>

# use this command:

g++ -I C:/MinGW/SDL2/ main.cpp link.cpp link2.cpp link3.cpp

Upvotes: 0

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