[Vm-dev] Mantis issue 7522 (dealing with files > 2GB on linux)

David T. Lewis lewis at mail.msen.com
Sun Jul 24 23:42:48 UTC 2011

On Sun, Jul 24, 2011 at 08:56:59PM +0200, Hans-Martin Mosner wrote:
> Am 24.07.2011 17:05, schrieb David T. Lewis:
> >  
> > On Sun, Jul 24, 2011 at 04:41:50PM +0200, Hans-Martin Mosner wrote:
> >>  
> >> Hello,
> >> quite some time ago (early 2010) I posted an issue on mantis about the linux VM's handling of files > 2GB.
> >> I don't remember whether I sent a report on the list, too, but in any case, current VMs still have the problem.
> >> IIRC, I had a half-working solution at that time, but I'm not sure what the right way is for getting this problem solved
> >> now.
> >> Could anybody please have a short look at this? It would be great if future VMs would be able to handle files of this
> >> size (many video files are bigger than that limit.)
> > Hans-Martin,
> >
> > The Mantis report is <http://bugs.squeak.org/view.php?id=7522>. I just
> > assigned it to myself (it had previously been unassigned, sorry).
> >
> > You mention that you had a half-working solution last year. Can you
> > describe the approach or post some code if you still have it?
> >
> > Thanks,
> > Dave
> >
> >
> I've looked at the files, and I think I was unsure at the time where to put the changes.
> There is a preprocessor define __USE_FILE_OFFSET64 , which should be defined
> pretty much before other linux include files will be read, so that off_t will be defined as __off64_t.
> I do not remember whether I tried to define that in the makefile and got problems in the make process,
> so I moved it into selected header or C files, or whether I directly started with the files - in any case, I think I did
> not get a fully working VM.
> I can try to set up a working build environment with VMMaker and everything, however, I don't know
> whether I will have time to do that before my vacation next week.

Thanks. I think that your vacation is the higher priority issue ;-)

I note that googling "largefile LFS gcc linux" seems to turn up
some relevant explanations.


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