Re: HEADS UP: plan to switch many ports over to GCC 12 soon

[CC added for port-sh3@, dropped for port-mips@ and port-powerpc@]

Hi,

On 2024/06/30 14:19, matthew green wrote:
>> On Sun, 2024-06-30 at 09:44 +1000, matthew green wrote:
>>> sh3 may be problematic,
>>
>> I can almost certainly test sh3. I should even be able to make a new
>> bootable disk for an end to end test.
> 
> oh the problem is it's broken -- rin@ could talk more about it,
> i'm just going on the notes in README.gcc12:
> 
> [20]: kernel needs -O1 for ffs32() and ffs_nodealloccg() for multi-user boot. Even if the whole kernel is built with -O1, it panics during ATF:
>        kernel/t_sysv (92/935): 3 test cases
>            msg: [ 3981.4751382] panic: kernel diagnostic assertion "msghdr->msg_spot >= 0" failed: file "../../../../kern/sysv_msg.c", line 426
> 
> [22]: single-user shell crashes. if userland is built with DBG=-O1, it boots into multi-user mode.
>        however, at least db(3) is broken, by which files are corrupted when edited by vi(1).
> 
> i didn't try landisk gxemul yet.
> 
> GCC 12.4 came out recently and i'll be updating to that, and
> it has some sh fixes, maybe for this?

The situation for sh3 is getting worse since these note were
added last year. Kernel from recent -current does not boot on
landisk, even if compiled with `DBG=O1`.

This does not change if two upstream commits b/w GCC 12.3 and
12.4 in `gcc/config/sh` are cherry-picked :(

I was just going to examine changes b/w 10.5 and 12.3...

Thanks,
rin