Re: Question on BIGGEST_ALIGNMENT in GCC on NetBSD/m68k
On Wed, 18 Jun 2025, Greg Ungerer wrote:
>
> > It's not really necessary to enforce this on Coldfire. However, since
> > buildroot builds completely from source, it wouldn't even be a problem
> > to change the alignment there as well.
>
> Yes, that is totally right in my experience. Certainly in my ColdFire
> work it is pretty much always a build-everything approach via buildroot
> or similar. I wouldn't think an ABI change would actually worry too many
> ColdFire uses, they don't use distributions like debian on them. (I
> would love to hear from anyone who does!).
>
That may work for end-users with a vendor BSP. But upstream developers
need to be able to swap components. In general, when debugging I often
have to run old binaries to find out whether I'm dealing with a deeper
regression or not. Also, there is the bisection problem. It's not just a
couple of distros who get to pay for an ABI break. It's the entire
ecosystem.
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