I'm getting confused about stubs...

Logic Pein logic.pn@gmail.com
Sat Apr 28 10:25:00 GMT 2012

Hello everyone
  I am using newlib for the first time.The manual says I should write stubs
to implement the basic functions.What function should I write?take sbrk for
example,should I implement
caddr_t sbrk(int incr)
{ ...}
caddr_t _sbrk(int incr)
?I'm using Sourcery G++ for STM32 chips.
Any help would be greately appreciated.

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