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From: Holger =?iso-8859-1?q?Hoffst=E4tte?= <holger@applied-asynchrony.com>
Subject: [gentoo-user] Re: Is "-fomit-frame-pointer" a gcc default?
Date: Tue, 12 Jul 2016 08:25:46 +0000 (UTC)
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References: <20160711202742.GA6195@waltdnes.org>
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On Mon, 11 Jul 2016 19:23:24 -0600, "J." García wrote:
> El lun, 11-07-2016 a las 20:47 -0400, waltdnes@waltdnes.org escribió:
>> On Tue, Jul 12, 2016 at 01:48:37AM +0200, Volker Armin Hemmann wrote
>>
>> > so it is not turned on on x86. Not sure about amd64. IIRC it is
>> > default
>> > on amd64, but I am not sure and too lazy to google. Just like the
>> > thread
>> > starter.
>>
>> Actually, I did Google. So did another particpant in the Pale Moon
>> forum. We got different answers, and various other people chimed in.
>> That's why I posted here. BTW, "gcc -O2 -Q --help=optimizers"
>> returns
>>
>> -fomit-frame-pointer [disabled]
>>
>> ...in both my real 64-bit Gentoo install and my 32-bit VM Gentoo.
>>
> I made a mistake, I didn't ran the 'gcc -Q .." command correctly, a
> typo, so I didn't really checked just got the list of optimizers, but
> checking again I also have it disabled by default:
>
> $ gcc -c -march=core2 -O2 -Q --help=optimizers |\
> grep fomit-frame-pointer
> -fomit-frame-pointer [disabled]
No, gcc is just lying. See this reddit comment thread for details:
https://www.reddit.com/r/Cprog/comments/2iv09b/frame_pointer_omission_fpo_optimization_and/
Running the 'gcc -v' snippet shows that -fomit-frame-pointer is indeed
enabled by default on amd64.
-h