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It is not currently possible for an extension that calls zend_ini_scanner_get_lineno() to be built shared under Windows.
This is because the zend_ini_scanner_get_lineno() symbol is not exported via the ZEND_API macro.
Please modify zend_ini_scanner.h and zend_ini_scanner.c, adding ZEND_API to the prototype and definition of the zend_ini_scanner_get_lineno() function.
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By the way, since 5.3 hasn't been released yet, it would be great if this was changed in 5.2 as well.