Re: [Ekiga-devel-list] ekiga on F-15

[Eugen Dedu <Eugen Dedu pu-pm univ-fcomte fr>]

On 04/05/11 17:54, Peter Robinson wrote:
> > > > > > Hey All,
> > > > > >
> > > > > > We're nearing the release of Fedora 15 but we have an issue with ekiga
> > > > > > in that is crashes [1]. I've reported the bug to ptlib now here [2]
> > > > > > with a full backtrace but it segfaults before I get any output if run
> > > > > > as ekiga -d 4.
> > > > >
> > > > > This is the crash that both Julien and me have just discovered this
> > > > > evening!
> > > > >
> > > > > The bug was reported on 10 March.  The version as of 8 April worked on
> > > > > my
> > > > > machine.  The version as of today does not work on my machine.
> > > > >
> > > > > The conclusion is that the bug was triggered by another application.  Is
> > > > > your ekiga built with gcc 4.6?  Another potential application is
> > > > > libboost.
> > > >
> > > > Yes, gcc 4.6.0 and boost 1.46.0
> > >
> > > I think it is the GCC, or rather a PTLib abuse of GCC.
> > >
> > > I have fixed a similar crash (for ptlib 2.8, but not 2.10) with the
> > > following patch:
> > >
> > > --- ptlib-2.8.3/include/ptlib/object.h.orig     2010-12-20
> > > 23:39:10.000000000 +0100
> > > +++ ptlib-2.8.3/include/ptlib/object.h  2011-04-28 13:08:04.000000000
> > > +0200
> > > @@ -947,7 +947,7 @@
> > >
> > >
> > >   // Memory pooling allocators
> > > -#if defined(__GNUC__)&&    __GNUC__>= 4&&    !defined(P_MINGW)
> > > +#if 0
> > >   #include<ext/bitmap_allocator.h>
> > >   template<class Type>    class PFixedPoolAllocator    : public
> > > __gnu_cxx::bitmap_allocator<Type>    { };
> > >   #include<ext/mt_allocator.h>
> > >
> > >
> > > For me it looks like PTLib tries to use some internal GCC API instead of
> > > standard std:allocaltor and it fails. I don't think using any internal
> > > APIs (and I consider anything which name starts with '__gnu_..' as
> > > such), even for great performance improvements, is a good idea.
> > > use of
> > > That patch fixes Ekiga-3.3.0 crash with ptlib 2.8, but the same Ekiga
> > > version seems to crash in a similar way when compiled with PTLib 2.10.
> > > In a similar way, but in a different place and the patch changes
> > > nothing.
> >
> > Thank you very much.  This fixes the issue!  I think you have done something
> > wrong when using ptlib 2.10, since ekiga 3.3.0 does not compile with it (as
> > far as I remember).
> >
> > It will be fixed upstream as soon as possible.
>
> I've tested that on a VM running ekiga remotely over a x forwarded ssh
> session so as to see that it at least runs (which it does). I'll push
> that patch to F-15 in the interim so ekiga at least runs.

Good.

> Also doing a quick grep through the ptlib tar file it seems there's a
> couple of usages of __gnu in it, it would be good to look through the
> ptlib/opal to ensure we don't have other violations of those __gnu
> functions.

See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=625616.  Wait and see.

--
Eugen