Enabling a function based on Language

[Iyer, Balaji V]

Hello Everyone,
        Is there a #define in GCC that will turn on only for certain languages? 
I am trying to use build_array_ref but it is giving me a undefined reference 
for f951. This code that I am trying to use will ONLY execute  if we have a 
C/C++ code.  Is it possible for me to enclose this inside some #defines (or a 
combination of them)?

Any help is greatly appreciated!

Thanks,

Balaji V. Iyer.