Linking C++ extensions

I was working on a C++-based extension and kept running into this module load failure: Undefined symbol "_Znwj" in Unknown on line 0 A little research told me that this occurs (on FreeBSD, at least) when a C++ extension is linked using gcc instead of g++. The extension's generated Makefile contained this line: libtool --mode=link gcc Changing it to use g++ fixed the problem. I couldn't find any prior information on this problem specific to PHP extensions, but reading through the acinclude.m4 code taught me about some additional parameters to PHP_NEW_EXTENSION(). Specifically, the sixth (optional) parameter can be used to force C++ linkage, e.g.: PHP_NEW_EXTENSION(ext, ext.cpp, $ext_shared,,, yes) Everything looks good after I made this change. I don't see any of the other PECL extensions using this additional parameter, however, so I wanted to mention it here so that others would also be aware of it. -- Jon Parise (jon of php.net) :: The PHP Project (http://www.php.net/)