Red Hat Bugzilla – Bug 90818
PHP doesn't require proper libxml2 to be installed
Last modified: 2007-04-18 12:53:42 EDT
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Description of problem:
I had libxml2-2.4.2-1 installed (I believe it was from Red Hat 7.2) and tried to
install php-4.2.2-19. When starting my httpd-2.0.40-21.1 it said it cannot load
libphp4.so because __xmlDoValidityCheckingDefaultValue is undefined. I think you
should require newer version of libxml2 or bump the library version, like you
use to when library API changes. I have downloaded libxml2-2.5.7-2 and it works.
In my opinion, php package should require this (newer) version of libxml2,
because it refuses to work with older ones.
Version-Release number of selected component (if applicable):
Daniel, in what version was __xmlDoValidityCheckingDefaultValue added to libxml2?
Hum, it's a 2.5.7 thing, I switched on thread support by default in 2.5.7
I think a "Requires libxml2 >= 2.5.7" should be sufficient,
sorry for this incompatibility, I had to make the jump at some point
and 2.5.7 release was the best time for this ...
It's difficult to find and eliminate this type of dependency; the only real
solution is to upgrade wholesale rather than try and mix and match packages from
different versions of Red Hat Linux.
Requires libxml2 >= 2.5.7
looks like a perfectly adequate way to flag the dependancy in the spec file
for this bug. Why won't this be fixed ?
This type of dependency can't be picked up automatically, unfortunately. Any of
the 30-odd PHP extensions might pick up a dependency on a newer version of the
particular library interface they wrap. We don't have the resources to
carefully audit thirty PHP modules and 30 library packages for such
compatibility issues, so can't pretend that upgrading to the PHP package from
RHL9 on a RHL7.2 system has any chance of working.