How to move gcc to compile to my own architecture?

How to move gcc to compile to my own architecture?

[Chengyin Yao]

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Yea so I'm just wondering, how to compile gcc to (my own) architecture cpu that has a completely different architecture?

Re: How to move gcc to compile to my own architecture?

[Jonathan Wakely]

On Fri, 16 Sept 2022 at 17:05, Chengyin Yao via Gcc-help
<gcc-help@gcc.gnu.org> wrote:
>
> Yea so I'm just wondering, how to compile gcc to (my own) architecture cpu that has a completely different architecture?

I'm not sure what you mean by "move gcc", and what is this "completely
different architecture"? The best answers depend on what you mean.

Have you created your own CPU with its own instruction set? Then you
want to "port" GCC (and binutils for the assembler and linker) to your
architecture. That's quite a lot of work. You could start by reading
https://gcc.gnu.org/onlinedocs/gccint/Back-End.html and
https://wiki.osdev.org/Porting_GCC_to_your_OS

Re: How to move gcc to compile to my own architecture?

[Jackson Pfeffer]

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I shouldn't assume (you know what happens)... But I assume they are asking
how to compile GCC from source on a machine running (for example) some ARM
chip running Linux to get an executable GCC that will run on (for example)
an Intel x64 chip running windows.

I assume (there it is again) that they are compiling on one well known
"architecture" targeting another well known (but different) "architecture".

I'm a GCC noob, but I think this basically amounts to them needing a cross
compiler. Beyond that... Is probably a question for Jonathan the great.

Jackson Pfeffer

On Fri, Sep 16, 2022, 11:28 Jonathan Wakely via Gcc-help <
gcc-help@gcc.gnu.org> wrote:

> On Fri, 16 Sept 2022 at 17:05, Chengyin Yao via Gcc-help
> <gcc-help@gcc.gnu.org> wrote:
> >
> > Yea so I'm just wondering, how to compile gcc to (my own) architecture
> cpu that has a completely different architecture?
>
> I'm not sure what you mean by "move gcc", and what is this "completely
> different architecture"? The best answers depend on what you mean.
>
> Have you created your own CPU with its own instruction set? Then you
> want to "port" GCC (and binutils for the assembler and linker) to your
> architecture. That's quite a lot of work. You could start by reading
> https://gcc.gnu.org/onlinedocs/gccint/Back-End.html and
> https://wiki.osdev.org/Porting_GCC_to_your_OS
>

Re: How to move gcc to compile to my own architecture?

[Jonathan Wakely]

On Fri, 16 Sept 2022 at 20:51, Jackson Pfeffer <crazykidjack@gmail.com> wrote:
>
> I shouldn't assume (you know what happens)... But I assume they are asking how to compile GCC from source on a machine running (for example) some ARM chip running Linux to get an executable GCC that will run on (for example) an Intel x64 chip running windows.
>
> I assume (there it is again) that they are compiling on one well known "architecture" targeting another well known (but different) "architecture".
>
> I'm a GCC noob, but I think this basically amounts to them needing a cross compiler.

Indeed, I should have said that the fist link on the osdev wiki covers
that case (which is much simpler than porting GCC to a brand new
architecture).

See https://wiki.osdev.org/GCC_Cross-Compiler for cross compiler
details. That's all you need to be able to use one type of machine to
compile code for a different type of machine.