Writing PHP4 Extensions in C++

Hi, I have written a simple function extension for PHP4 in C and it is working very good. I can load the library with dl("test.so") and I can call the function mytest() returning a Test string. But finally I want to write the extension in C++, so I can use classes and the STL. But when I compile my C-source with the C++ compiler g++, PHP is refusing to load the library. It tells me, that test.so is not a PHP library. I have checked the API header files of PHP4 and there a LOT of compiler switches concerning C++ in them. Have I to recompile PHP4 with a C++ compiler to be able to use PHP4 extension modules written in C++? Is there a configuration switch in the Makefile to switch to C++? Or is it just impossible to use C++ code for PHP4 extension libraries? Bye K