Hello
Which processor are you targeting (HC08, HC12, MPC5xx, ...)?
Which version of CodeWarrior are you using?
I have used extern "C" in several occasion and it was working.
Note that extern "C" should be used when you include ANSI C header files in a C++ source file.
Reading your message I have the impression you are trying to do the opposite.
Basically you cannot include a C++ header file in a ANSI C source file.
CrasyCat