Bison complains about undefined reference of my own data type

[Efstratios Gavves]

Hi!

I am a newbie in bison, so I don't know all the secrets. I used for a 
while a standard example with its own data type and now I want to 
include my own. I included the header file, but the compiler throws me 
an exception for undefined reference. However, this is not true, the 
implementation of the function of my data types class are in the cpp 
file. The explanation I can give is the following.

The example's data type was in a header file, let's say example.h. The 
implementation was in the same .h file, so it worked. My data type's 
implementation is in a separate .cpp file. So, there is some problem for 
bison to recognize .cpp files? Maybe, because it is in C and not C++ ?

Do you now if there is a solution? The cpp can't get into the h, because 
they are already built, so I can't just change them all, it's a pretty 
big project.

Thank you,
Stratis