gdb break when exception is thrown how?

[augie]

i read this in the gdb documentation:

Set catchpoints to catch events.
Raised exceptions may be caught:
        catch throw               - all exceptions, when thrown

i read somewhere that when you use this gdb will break when a c++
exception is thrown, but im not quite sure how to use it?

i compiled with debugging set and then ran gdb on the program and tried
just typing "catch throw" but i get an error: 

"warning: Unsupported with this platform/compiler combination."

suggestions?

--augie