Re: [Emutos-devel] Building EmuTOS with Debian m68k-linux-gnu GCC v8.3 cross-compiler

[Vincent R. <vin...@fr...>]

On 27/10/2019 at 15:50, Eero Tamminen wrote:
> I've updated my Debian to current stable, which has (m68k) GCC v8.3.
> 
> Getting EmuTOS sources to compile required following hack patch.
> 
> After that, EmuTOS can be built in Debian (stable) with:
>      $ sudo apt install gcc-m68k-linux-gnu
>      $ make TOOLCHAIN_PREFIX=m68k-linux-gnu- ELF=1 512

Oh. I wasn't aware that an m68k cross-compiler was officially shipped with 
Debian. That's very fine.

> However, the resulting binary won't boot.

You built it the right way. And it is supposed to work. I check from time to 
time with m68k-elf-gcc 7.1.0. I checked it for last release.

But beware of the ABI. Some GCC m68k targets return pointers in a0, while 
they are normally returned in d0. This affects the interface between C and S 
sources. Currently, EmuTOS only supports compilers returning pointers to d0, 
and this is unlikely to change. I have a vague remembrance that GCC for 
m68k-linux may return pointers in a0. This has to be checked.

For memory, you can get m68k-atari-mint-gcc 4.6.4 for Debian stable there:
http://vincent.riviere.free.fr/soft/m68k-atari-mint/debian.php

-- 
Vincent Rivière