Re: [xml] Compilation error

[Daniel Veillard <veillard redhat com>]

On Thu, Jul 26, 2007 at 04:02:48PM +0200, Marco Spinetti wrote:
> I don't know if this versioning problem is a good news or not.
> For example RHEL 3 has python 2.2.3: so I suppose that it's no possibile 
> to use tha last versions of libxslt.
> It's a bad news.

  The *only* solution to avoid this kind of problem is to not code
anymore on libxml2 or libxslt. If you really want to backport, then
do it, but as I said it does take time and expertise, running old systems
is NOT CHEAP. The way you can do this is the following, go back to 
the diffs between 2.6.16 and 2.6.17, find the enhancement of libxml2
and libxslt which added support for booleans in XPath from python. 
Get a revert patch, use that patch on recent release, do the QA to
make sure this doesn't break other libxml2 python apps (like for example
RHEL installer) and then keep your forked version.
  Other way try to find how to still prvide that capability an compile
on version of python who don't export boolean type info at their C
interface.

  You cannot have the old system and the new piece without also the
cost of doing the exercise. I'm already extremely careful and cautious
to not break old platforms but sometimes you have to make progress, the
only solution otherwise is no progress and then people will complain
it doesn't work on the *newer platform*.

  What you are asking for is a very costly operation. The open source
project can't really do that for you, I guess you must assume the cost
(in time at least) needed by your own constraints.

Daniel

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