I was able to get an AArch64 installation running with Qemu, and I
think I've found the main problem with these failing builds.

The end of "gc2.h" has a preprocessor test for `__x86_64__` or `WIN64`,
but it should have been a more general test for
`SIXTY_FOUR_BIT_INTEGERS`.

With that repair, the AArch64 build still fails for me due to a GC
problem. If I disable generational GC, then the build seems ok. I think
I've had trouble in the past, where the signal handlers that implement
the write barrier didn't work correctly inside Qemu. The problem might
not be Qemu-specific, though, and I'm interested to hear whether the
"gc2.h" change to use `SIXTY_FOUR_BIT_INTEGERS` fixes the problem on
real machines.

Here's the commit to fix "gc2.h":

 https://github.com/plt/racket/commit/0cda0c98b085dc289bbb40cb37325042b35eea07

At Mon, 29 Jun 2015 21:58:12 -0400, James McCoy wrote:
> On Tue, Jun 30, 2015 at 02:44:46AM +0200, Juan Francisco Cantero Hurtado 
> wrote:
> > Similar bug: 
> http://bugs.racket-lang.org/query/?cmd=view%20audit-trail&database=default&pr=1
> 5079
> > 
> > David, Debian has some machine with those architectures available to give
> > shell accounts to upstream developers?. I asked for a shell account for
> > Matthew in the OpenBSD mailing list long time ago but nobody replied.
> 
> Yes, David or I could sponsor a request to get Matthew guest access on
> relevant porterboxes[0] if he'd like to debug the build failures[1].
> 
> Matthew would just need to follow the “non-DMs” instructions[2] to
> provide one of us with the relevant information we can use to make the
> request.
> 
> [0]: https://db.debian.org/machines.cgi Systems where purpose=porterbox
>      and hostname matches debian.org.
> [1]: https://buildd.debian.org/status/package.php?p=racket
> [2]: https://dsa.debian.org/doc/guest-account/ DMUP refers to [3]
> [3]: https://www.debian.org/devel/dmup
> 
> Cheers,
> -- 
> James
> GPG Key: 4096R/331BA3DB 2011-12-05 James McCoy <[email protected]>

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