On Mon, 11 Jul 2016 19:23:24 -0600, "J." García wrote: > El lun, 11-07-2016 a las 20:47 -0400, [email protected] 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
