Re: [xml] libxml2 messed up MonoTouch and Interface Builder

[Daniel Veillard <veillard redhat com>]

On Tue, Nov 09, 2010 at 02:50:23PM -0800, Mark Rowe wrote:
> On 2010-11-09, at 07:37, Daniel Veillard wrote:
>
> > On Tue, Nov 09, 2010 at 04:01:02AM -0800, Mark Rowe wrote:
> > > Based on your description it sounds like you've overwritten your
> > > system copy of libxml2 with a copy that you built yourself from source.
> > > Replacing system components of Mac OS X in this manner is not supported.
> > > It's likely that the version of libxml2 you've installed is incompatible
> > > with the Mac OS X system frameworks in some way which is leading to
> > > the crashes that you're seeing.
> >
> >  Of course that got me curious. Do you have any specific patches
> > which could lead to such errors if not embedded in ? Except a change
> > in the way encoding are provided I don't really how such an error
> > could happen. Not that I suggest replacing system libraries, but
> > I wonder if you have patches which should be upstreamed,
>
> The only substantial change from upstream libxml2 is the use of ICU
> for encoding conversions rather than iconv.  It's unlikely that this

  Okay, I commited this and it's in 2.7.8 so that should not need
further patch in the future (well except it's off by default it's a
build setting).

> is related to the crash that James was seeing.  The most likely cause
> for this crash, based on previous experiences, would be a system library
> relying on libxml2 internals, necessitating that the framework be rebuilt
> when the version of libxml2 it is running against is changed.

  Well libxml2 exposes most of its internals in the API, and I try very
hard to not break those, so that's still a bit surprizing to me, it may
happen bt I think we got hit only twice for the last decade or so in the
Linux world (and people override default libs all the time :-)

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/