Red Hat Bugzilla – Bug 90818
PHP doesn't require proper libxml2 to be installed
Last modified: 2007-04-18 12:53:42 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020623 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): php-4.2.2-19 How reproducible: Always
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 ... Daniel
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.
WHAT ???? 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 ? Daniel
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 Any of the 30-odd PHP extensions might pick up a dependency on a newer version of the particular library interface they wrap.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.