Linking Confuson

Mini · Post by **Mini** » Mon Apr 30, 2007 6:33 pm

Hello I've bean following this tutorial for making an OS kernel in C++ and its all working except when I get to this part:

ld -T Link.ld -o Kernel.bin Loader.o Kernel.o Video.o

I made the 'Link.ld' file but were do I put that code?

And you'll have to explain it in newb for me because im only 13 so ya.

pcmattman · Post by **pcmattman** » Mon Apr 30, 2007 7:13 pm

OK, first some questions. Do you know C++? How well do you know it? Don't use OS development as a way to learn a language, it just makes it harder than it already is.

Link.ld is a linker script that tells ld where it needs to put each of the segments (.text, .data, .rodata, .bss) in the final file. Would you mind showing us what you have in link.ld?

Mini · Post by **Mini** » Mon Apr 30, 2007 7:24 pm

Code: Select all

/* Link.ld */
OUTPUT_FORMAT("binary")
ENTRY(start)
SECTIONS
{
    .text 0x100000 :
    {
        code = .; _code = .; __code = .;
        *(.text)
        . = ALIGN(4096);
    }

    .data :
    {
        data = .; _data = .; __data = .;
        *(.data)
        . = ALIGN(4096);
    }

    .bss :
    {
        bss = .; _bss = .; __bss = .;
        *(.bss)
        . = ALIGN(4096);
    }

    end = .; _end = .; __end = .;
}

And I've been using C++ for about 1 year now.

Oh and if you need to know im using: flat assembler

pcmattman · Post by **pcmattman** » Mon Apr 30, 2007 7:25 pm

That all looks right.

except when I get to this part

What happens?

Mini · Post by **Mini** » Mon Apr 30, 2007 7:31 pm

Were do I put it?

Pyrofan1 · Post by **Pyrofan1** » Mon Apr 30, 2007 7:34 pm

Put what?

pcmattman · Post by **pcmattman** » Mon Apr 30, 2007 7:35 pm

Put what?

Mini · Post by **Mini** » Mon Apr 30, 2007 7:37 pm

Were do I put:

ld -T Link.ld -o Kernel.bin Loader.o Kernel.o Video.o

? Do I put it in the command promt or do I put it in a .cpp or a .h file were do I put it?

Pyrofan1 · Post by **Pyrofan1** » Mon Apr 30, 2007 7:39 pm

yes you enter it into a prompt or you put it in a make file

pcmattman · Post by **pcmattman** » Mon Apr 30, 2007 7:39 pm

OK, that's a command line to run the executable 'ld'. Do you have GCC?

Also, make sure that loader.o, kernel.o and video.o exist (assembled, compiled etc...).

Command lines are second nature to the operating system developer. You'll have to get used to them.

Mini · Post by **Mini** » Mon Apr 30, 2007 7:40 pm

how do I put it into a makefile?

Mini · Post by **Mini** » Mon Apr 30, 2007 7:42 pm

No I dont have GCC I have DevC++

Brynet-Inc · Post by **Brynet-Inc** » Mon Apr 30, 2007 8:16 pm

Mini wrote:No I dont have GCC I have DevC++

Wow, This is rather... funny, DevC++ is a Windows frontend to GCC "Mini"..

Is anyone else buying this kids 1 year programming claim?

I'll say this "Mini", For someone who has been using GCC for a year.. you sure haven't learnt much if you don't even know the name of compiler you're using..

And not having the ability to determine what is and what isn't a command line? How is that possible?

Alboin · Post by **Alboin** » Mon Apr 30, 2007 8:34 pm

Brynet-Inc wrote:
Mini wrote:No I dont have GCC I have DevC++
Wow, This is rather... funny, DevC++ is a Windows frontend to GCC "Mini"..

Is anyone else buying this kids 1 year programming claim?

Do you know 'kid' is from the Norse word 'kidh'? I was looking up if 'kids' is possessive or just plural. Is it "kid's", or "kids' "? I can't find a straight answer.

Brynet-Inc wrote: I'll say this "Mini", For someone who has been using GCC for a year.. you sure haven't learnt much if you don't even know the name of compiler you're using..

And not having the ability to determine what is and what isn't a command line? How is that possible?

Is there a book that actually explains what a compiler is, what a linker is, or even what an IDE really is? It seems that every introduction book omits these. It just says "type this", "type that". This is greatly annoying and is the root for problems like this. Maybe I'll write a tutorial or something....

Combuster · Post by **Combuster** » Tue May 01, 2007 4:28 am

Alboin wrote:Is there a book that actually explains what a compiler is, what a linker is, or even what an IDE really is? It seems that every introduction book omits these. It just says "type this", "type that". This is greatly annoying and is the root for problems like this. Maybe I'll write a tutorial or something....

There is wikipedia, and there's no reason to not use it instead