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Re: [avr-gcc-list] Fwd: [Tinyos-help] TinyOs avr-gcc-4

From: John Regehr
Subject: Re: [avr-gcc-list] Fwd: [Tinyos-help] TinyOs avr-gcc-4
Date: Mon, 15 Oct 2007 12:41:32 -0600 (MDT) 
A little more information for the gcc3 / gcc4 discussion:

- for complicated TinyOS codes we get plenty of internal compiler errors 
  from avr-gcc3 (the one distributed with TinyOS, I mean)

- gcc3 has some abyssmally bad bugs regarding handling of volatiles that 
  seem to be fixed in gcc4

- we have some good measurement infrastructure for AVR codes.  I'll try to 
  get one of my people to take the time to measure the CPU usage, code 
  size, and stack memory usage of some TinyOS applications under avr-gcc3 
  and avr-gcc4 and then I'll post a comparison here.  To the extent that 
  TinyOS applications are typical of interrupt-driven ATmega codes, this 
  may be of general interest.

John Regehr
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