Linker error. Xcode 3.1.3 + iPhone

Hi i'm pretty new to XCode, I am extending an example project and have had no problems until now.
A small but annoying block to my progress has turned up in trying to create and use a c++ class in my project.
I have created a .cpp and .h through the NewFile menu, the .cpp has automatically been added to the "Classes", "Compile Sources" and "Implementation Files" folders.
I have renamed the view class (that will be using the c++ classes) file to .mm (obj-c++) and included the new header file.
Everything seems to be fine, there are no compiler errors but the linker cant find any symbols for code in the .cpp file, if I inline the functions in the header file all is well but if I move them to the .cpp file then the linker baulks.
The new c++ file's object has been created and is in the same folder as the other local objects.
I have tried multiple cleans and rebuilds.
I have another other example project which use cpp files and it compiles and links fine.
Are there project settings I need to change to allow linking to *.cpp files?
Thanks, hjd_uk.

Hi hjd. Welcome to the dev forum!
I would start by ruling out some of the simple errors you might have overlooked because of the unfamiliar environment.. like functions that aren't public, etc. Since you can call your inline functions from obj-C, what happens if you make an inline wrapper for one of the functions the linker can't find? That should tell you something right away. Depending on how that test goes, you might also try making another C++ class (.h + .cpp) and see if that class can call functions in the first C++ class.
I"m guessing you'll see what's going on by ignoring Xcode and just looking at the source files. If not, try to strip the project down to a minimal test bed and post the source here (in that case be sure to read the code formatting announcement, and use the Preview tab to see how your code looks).
\- Ray

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