[racket] Build hanging on Debian ARM

I think this is now fixed.

To catch up the list: We tracked down the problem to an incorrectly
encoded instruction. Most processors (and the gdb disassembler)
apparently don't care about the bits that were incorrect, but Deren's
does.

As you can imagine, it did not immediately occur to us to check the
encoding of a single instruction at the bit level, so thanks for Deren
for his patience and help.

At Tue, 1 Jul 2014 09:18:49 -0400, Deren Dohoda wrote:
> Hi Matthew,
> 
> I get
> Attaching to process 13920
> Reading symbols from
> /root/racket/racket-6.0.1/src/build/racket/racketcgc...done
> .
> [lots of loads omitted]
> 0x01b230f8 in ?? ()
> (gdb) bt
> #0  0x01b230f8 in ?? ()
> #1  0x40826940 in ?? ()
> #2  0x40826940 in ?? ()
> Backtrace stopped: previous frame identical to this frame (corrupt stack?)
> 
> Ugh.
> 
> Deren
> 
> 
> 
> On Tue, Jul 1, 2014 at 12:55 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> 
> > I don't have a great idea, but can you use gdb to attach to the
> > spinning "racketcgc" process (that's running "xform.rkt") and get a
> > stack trace?
> >
> > My guess is that something goes wrong in communicating with the
> > subprocess that created by "xform.rkt" to run the C preprocessor, and
> > we should be able to tell at least that much from a stack trace.
> >
> > At Mon, 30 Jun 2014 09:51:52 -0400, Deren Dohoda wrote:
> > > I have not had a lot of experience building Racket from source, but I
> > > downloaded the minimal racket source and followed the instructions on the
> > > readme. The configure step seems to encounter no problems, but when I run
> > > make afterwards, it gets to the step of "Compiling xform support... Done
> > > making xform-collects." Then the build just hangs. xform.rkt is running
> > > like mad in the background, which seems to be the proximate culprit. At
> > > first I thought I was just being impatient, it's only a ~500MHz
> > processor,
> > > but I let it run all weekend and there was no apparent progress.
> > >
> > > Can someone help me troubleshoot this? What information can I provide
> > that
> > > would be helpful?
> > >
> > > Thanks,
> > > Deren
> > > ____________________
> > >   Racket Users list:
> > >   http://lists.racket-lang.org/users
> >
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