bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Pip Cet]

On Sun, May 24, 2020 at 7:01 PM Andy Moreton <andrewjmoreton@gmail.com> wrote:
> > So your flavor is even more broken than what Debian ships? That's
> > interesting, which flavor is it?
>
> FYI, there are two separate projects:
>   mingw.org: 32bit only.
>   mingw-w64: 32bit and 64bit, using a different C runtime.
>
> On my machine a simple test program shows:
>
> --------------------------------------------------------------
>   project     gcc     cpu   alignof(max_align_t)
> --------------------------------------------------------------
> mingw.org   9.2.0    i686   16
> mingw-w64  10.1.0    i686   16 (stdint.h before stddef.h)
>                              8 (stdint.h after  stddef.h)
> mingw-w64  10.1.0  x86_64   16
> --------------------------------------------------------------

Thanks!

> This problem only appears with the 32bit mingw-w64 toolchain.

FWIW, the problem is that the incorrect value of 16 is returned in
some cases. All 32bit toolchains appear to be broken. I said that
mingw.org was "more broken" than mingw-w64 because it _always_ returns
the incorrect value, rather than doing so only for an unfortunate
combination of #includes.

> Eli uses the mingw.org toolchain. Linux distros initially used
> mingw.org, but switched to mingw-w64 cross compilers several years ago.

I couldn't get the mingw.org toolchain to work at all...