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COMMON vs bss/sbss sections




What's the difference between the COMMON and bss/sbss sections? Both
refer to uninitialized data which must be zeroed out, so why have a
COMMON section -- shouldn't those variables be part of the bss section? 
This is a powerpc-eabi, linux hosted cross compiler I'm using
(gcc-2.95.2, binutils 2.9.1).  

Thanks,

Pete

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