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Re: [perl bindings] Bizarre copy of UNKNOWN in subroutine

From: Stefan Sperling <stsp_at_elego.de>
Date: Mon, 20 Jun 2011 21:28:32 +0200

On Mon, Jun 20, 2011 at 09:54:12AM -0400, Stéphane Gaudreault wrote:
> Le 19 juin 2011 13:53:12, Stefan Sperling a écrit :
> > On Sun, Jun 19, 2011 at 07:43:31PM +0200, Otto Allmendinger wrote:
> > > So does this qualify as a proper bug? Can I add this to the issue
> > > tracker?
> >
> > Yes, please add it.
> >
> > Someone will need to pin down where the problem is coming from.
> > Is it SWIG? Is it Perl? Is it Subversion?
> >
> > Can you try to reproduce the problem with an earlier version of
> > SWIG and/or Perl?
> Hi,
> We think that only 32 bits systems are affected by this bug because
> cd subversion-1.6.17/subversion/bindings/swig/perl/native; make test
> fails on i686, but works on x86_64[1].
> We have that problem with either swig 2.0.3 or 2.0.4. We had no problem with
> perl v5.12.3. The problem was noticed after the upgrade to v5.14.0. Someone
> suggested that the problem could be related to the use of 64bits offset by perl
> [2].
> Regards,
> Stéphane Gaudreault
> [1] https://bugs.archlinux.org/task/24540
> [2] http://www.gossamer-threads.com/lists/perl/porters/263222

Are you sure the test failures referenced in [2] are related to
the "bizarre copy of UNKNOWN" problem? I don't see that error
appearing in [2].

But if your are sure it's related, the link at [2] clearly explains
that perl and extensions were compiled in an incompatible way:

 "I doubt there's anything crucial about the particular flag, but rather
 it's the fact that you're building extensions using flags that give
 you code that is binary incompatible with the perl binary it's being
 built against."

 "With options like -D_LARGEFILE_SOURCE and -D_FILE_OFFSET_BITS=64' used
 to build Perl but dropped when testing extension building, you could
 be getting a different and incompatible stat structure or other binary
 incompatible differences between the extension and the Perl core. "

Which is right. Any software that shares data structures needs the
data structures to be compatible. Else it crashes and whatnot.

So is this "bizarre copy of UNKNOWN" problem showing anywhere else than
Debian and Arch Linux? Maybe it's a problem with how these distributions
compile perl and related software? Maybe Perl is compiled with support
for large files but Subversion is not, or something like that?
Received on 2011-06-20 21:29:08 CEST

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