How to make a cross compiler using gcc?

问题

Though there are many tutorials online on how to make a cross compiler, I am actually not getting it.

I am using fedora 16 and already have gcc installed. I am not sure about binutils. How do I make a cross compiler for my own OS (the target)? I was reading here on os dev wiki but I don't get it. I mean, what do I do ? I just don't follow there steps.

Note : I want to build a cross compiler for the same architecture I am currently working on.I mean the same architecture that is running fedora.

回答1:

If the architecture of your own OS is the same than your running OS, then you do not need a new compiler, the same you already have will do. You may still need custom binutils, though, but that depends on the format of the executables your own OS needs.

What I've done for my own toy OS is to make it understand ELF binaries: it is an absurdly easy format to load and run. And this way you can use the standard binutils of your OS. You just have to link your executables with a custom linker script, and not to link with any linux library.

But note that many people consider this not such a good idea, but it may keep you going for a while.

My compiler command looks like:

%.o: %.c
        gcc -c -o $@ -ffreestanding -fno-stack-protector -mpreferred-stack-boundary=2 -Os -g -Wall $<

And my linker command:

%.myexe: %.o
        ld -o $@ -T myexe.ld $^ `gcc -print-libgcc-file-name`

For reference, the linker script is myexe.ld:

ENTRY(main)

SECTIONS
{
    .text :
    {
        *(.text)
    }
    .data :
    {
        *(.data)
    }
    .rodata :
    {
        *(.rodata)
    }
    .bss :
    {
        *(.bss)
    }
}

来源：https://stackoverflow.com/questions/17675029/how-to-make-a-cross-compiler-using-gcc