issue with register name and global variables

["nagaraju.m" <nagaraju dot m at redpinesignals dot com>]

Hi,

   I am generating a global variable with out an underscore in my 
compiler.(gcc-3.3)

eg:
    int r1=10;
   int main()
   {
       return 0;
   }

The problem here is , i have a register named "r1"
So my assembler is issuing an error saying "register value used as 
expression ".
I am using binutils-2.13.1 ( as I am supposed to deal with older 
versions of source code)
So, how I can make sure my assembler differentiate variable name and 
register name.

Thanks,
Nagraj