Re: [avr-gcc-list] -O vs. -O2

[Nathan Cooprider]

Russell Shaw wrote:
> What are you trying to do? Any autoconf package can be set for -02 with:
> ./configure CFLAGS="-g -O2"

I am using avr-gcc as part of the TinyOS package, along with a bunch of 
other non-TinyOS tools. The non-TinyOS tools do something to the TinyOS 
applications so that they compile fine with avr-gcc -O, but then break 
with -Os or -O2. My understanding is that -O2 is just -O with some extra 
command options. I looked through the manual and found what options 
those were, but adding them to -O did not trigger the error. So I was at 
a loss.

Unfortunately, I believe I am stuck using an older version of gcc. Which 
sort of makes my problem irrelevant for this list. Also, I probably just 
have to look at the actual command line options in the source and find 
out which ones -O turns on and which ones -O2 turns on. Anyway, thanks 
for the concern.

Nathan