Locating a variable to an specific address

Hi,

I'm trying to locate a variable to an specific address. There are three ways to do this:

1) using options of the file that have the variable and config the RAM area
2) unsigned int cont __at (0x2000000);
3) #define cont (*((unsigned int *)(0x2000000)))

The first one, is too bad because is posible that I want to locate variables to diferents locations.
The second one, is perfect for me, but when compiling the compiler generate a very big file from CODE area to RAM area even using a not init area.
The third one, works perfect, but is not a standard way to do it.

How can I use __at tense without make a very big file?

My code are located at 0x1000000 and the data are at 0x2000000.

Thanks!!!