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

From: Nathan Cooprider
Subject: Re: [avr-gcc-list] -O vs. -O2
Date: Thu, 26 Jul 2007 20:21:47 -0600
User-agent: Thunderbird (Windows/20070716)

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.


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