Re: [Gcl-devel] Re: ./configure on Apple MacIntosh G5, with MacOS 10.3.4

[Camm Maguire]

Greetings!  Thanks for looking into this, Aurelien!

I'm guessing that it would probably be fastest if you were able to
reproduce Warren's results on your own machine, if you have time of
course.  Most people familiar with lisp are not familiar with gdb.

Take care,

Aurelien Chanudet <address@hidden> writes:

> Hi Warren,
> 
> > I wish I could be more specific.  When I save an
> > application without
> > disabling SGC, then sometime later, using that saved
> > application, I
> > get random failures.  For instance, yesterday, when
> > running the
> > compiler, during the second pass, it just stopped
> > right in the middle
> > of printing a C-variable symbol to file for
> > compilation by the GCC.
> > 
> > I don't have any trouble getting errors, but I
> > haven't been able to
> > get the same error twice, thus I don't know what to
> > report to you.  If
> > I disable SGC, then my saved applications work as
> > expected.
> > 
> > Let me further describe the scenario.  I am working
> > with NQTHM-1992 or
> > ACL2, two symbolic computation tools.  The system
> > building process for
> > both of these tools involves compiling a number of
> > files, loading the
> > compiled images, and then using the GCL command
> > SI.:SAVE-APPLICATION
> > to produce an application.
> > 
> > If I use the tools as they is produced by the system
> > build process,
> > but without saving the application, then I seem to
> > be able to use the
> > system as I would expect (even though SGC hasn't
> > been disabled).  That
> > is, if I compile and load the files that comprise
> > the system and then
> > use this running system, then everything seems to
> > work normally.  But,
> > if I save either of these systems and attempt to use
> > them (without
> > disabling SGC), then I get different (random) errors
> > as I use the
> > resulting systems -- these errors are often fatal.
> 
> Might it be that the state of memory (that is,
> read/write/execute protections) is incorrectly
> restored upon re-execution of a saved image ?
> 
> As a temporary conclusion, can we say that these
> random bugs completely disappear if SGC is disabled ?
> 
> Could you run your NQTHM-1992/ACL2 in gdb and see if
> the crash is due to EXC_BAD_ACCESS exceptions ?
> 
> > If I can isolate a repeatable failure, I will it
> > send along.
> > 
> > Cheers,
> > 
> > Warren
> > 
> 
> Thanks,
> Aurelien
> 
> 
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> 
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-- 
Camm Maguire                                            address@hidden
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"The earth is but one country, and mankind its citizens."  --  Baha'u'llah