CC 5.5 compiler flag to issue 64bit porting warnings on sparc-solaris

Hi,

We are porting our application from 32bit to 64bit.
We tried -xarch=v9, -xarc=v9a and -xport64=full options so that compiler to issue 64bit porting warnings.
But we are not getting any porting warninings
WE are using CC 5.5 compiler on sparc-solaris m/c.
Please tell us some powerful option to issue 64bit porting warnings.

Thanks
Shobha