how to set fixed address for variables/functions  at compiling stage in ADS?

Note: This was originally posted on 18th September 2009 at http://forums.arm.com

in ads 1.2, I set fixed address for a variable like this:

int    file_len  __attribute__((_at_(0x16000))) = 0;  

but compile error, how can i do?

thank you very much!
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