Description:
------------
The Sun Studio compilers don't seem to like it when a vararg is passed
as a zstr union and then retrieved as a (UChar *). Specifying
class_name.v instead of class_name to php_printf fixes the problem.
This doesn't seem to be a problem on Ubuntu/gcc.

Based on feedback
(http://forums.sun.com/thread.jspa?threadID=5415962&tstart=00) from
the Sun compiler folks, it seems that the following patch is necessary
for PHP6 (trunk).

http://bitbucket.org/arvi/arviq/src/tip/svn-zstr-varargs-patch.txt

Reproduce code:
---------------
http://marc.info/?l=php-internals&m=125802929326277&w=2 is the relevant mail thread on internals.

Expected result:
----------------
Tests such as tests/classes/__set__get_001.php should pass when executed using a PHP built with Sun Studio's compilers.

Actual result:
--------------
Lots of test failures on Solaris.