Re: Bug#1105110: python3.14 FTBFS on m68k: Assertion `!PyStackRef_IsTaggedInt(ref)' failed

[Laurent Vivier <laurent@vivier.eu>]

Le 14/05/2025 à 09:41, John Paul Adrian Glaubitz a écrit :
> Hi Geert,
>
> On Wed, 2025-05-14 at 08:55 +0200, John Paul Adrian Glaubitz wrote:
> > On Tue, 2025-05-13 at 22:08 +0200, John Paul Adrian Glaubitz wrote:
> > > There is a guide available which explains how to install AMIX on WinUAE:
> > >
> > > https://www.amigaunix.com/doku.php/installation
> > >
> > > https://oldosplayground.blogspot.com/2018/01/amiga-unix-amix-21-installation.html
> > >
> > > I will try that later this week. I'm really curios to learn whether they're
> > > using ELF with 4 bytes alignment.
> >
> > I have kicked off the installation of AMIX 2.1 on WinUAE now.
> >
> > It actually looks very streamlined and user-friendly ;-).
> >
> > Let's see if I can get to compile the sample program and see what the alignment says.
>
> So, it turns out that AMIX 2.1 uses ELF binaries and indeed 4 bytes alignment.
>
> See the screenshot here: https://people.debian.org/~glaubitz/amix-alignment.jpeg
>
> Please excuse the messed up formatting, I couldn't type backslashes.
>
> Thanks for suggesting to test AMIX, that information is very valuable.

You can use __alignof__() to have the data type alignment:

    int main(void)
    {
            printf("alignof(short) %ld\n", __alignof__(short));
            printf("alignof(int) %ld\n", __alignof__(int));
            printf("alignof(long) %ld\n", __alignof__(long));
            printf("alignof(long long) %ld\n", __alignof__(long long));
    }

On x86_64, it gives:

alignof(short) 2
alignof(int) 4
alignof(long) 8
alignof(long long) 8

Thanks,
Laurent