Description:
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I try to test a newly created PECL extension, the extension shared object file has been created in ./modules/myext.so

when i do a "make install" to copy the myext.so to the default extension
directory first i can load it just fine using either "php -d 'extension=myext.so'"
or using dl("myext.so"); within my code

when i start php with "php -d 'extension_dir=./modules'" i can use 
dl("myext.so"); within my code just fine, too. the extension is loaded
from ./modules as expected

but when i try to use both commandline options 

  php -d 'extension_dir=./modules' -d 'extension=myext.so'

myext.so is either loaded from the default extension_dir, 
not ./modules, or it is not loaded at all if not present in the
default extension dir

Expected result:
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-d 'extension_dir=...' should take effect right away if given on the command line, even for following -d 'extension=...' options