This behavior is mostly likely a result of the changes to the included
system libraries in 10.3. The truth to the matter is now dlcompat is
distributed with OS X (as of 10.3) so most of the library handling code
Marko and I wrote probably is no longer necessary for future
generations of OS X (please note this is untested). It is necessary
though for those running 10.2 (and earlier), and there do seem to be a
great many of them still.

Looking at your change though, I don't believe it should cause much
damage.

Hi guys,

There seem to be some problems with loading shared libraries on the
MAC OS X platform. It seems that ./configure on MAC OS X defines
HAVE_LIBDL in php_config.h which causes the following code in zend.h
not to be used:
#elif defined(HAVE_MACH_O_DYLD_H)

define DL_LOAD(libname) zend_mh_bundle_load(libname)

define DL_UNLOAD(handle) zend_mh_bundle_unload(handle)

define DL_FETCH_SYMBOL(h,s) zend_mh_bundle_symbol(h,s)

define DL_ERROR zend_mh_bundle_error

define DL_HANDLE void *

define ZEND_EXTENSIONS_SUPPORT 1

After testing this stuff quite a bit it seems that in order for DSO's
to work correctly on MAC OS X they should be defined. I am thinking of
changing the following code in zend.h:

#if defined(HAVE_LIBDL)

to

#if defined(HAVE_LIBDL) && !defined(HAVE_MACH_O_DYLD_H)

Anyone have additional insight on this?
Andi