what should be -march?

mansniks · Apprentice Joined: 19 Nov 2007 Posts: 290

Hello,

if I want to compile programs on amd64 Athlon and run them on 64 bit Xeon too, what should be g++ options?
Currently I have :

-m64 -Dlinux64 -DDP -Wall -Wno-strict-aliasing -Wextra -Wno-unused-parameter -Wold-style-cast -march=opteron -O3 -DNoRepository -ftemplate-depth-40

Thank you!

Sadako · Posted: Mon Apr 14, 2008 10:36 am Post subject:

it should be -march=x86-64 for compatibility with intels 64 bit cpu's, and you'd probably be better off with -O2 rather than -O3...
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mansniks · Apprentice Joined: 19 Nov 2007 Posts: 290

Thanks, what is the difference between -O2 and -O3?

widremann · Veteran Joined: 14 Mar 2005 Posts: 1314

mansniks · Apprentice Joined: 19 Nov 2007 Posts: 290

Ooooo, funny, right?

Anyway, I'm not really interested about it...

zoni · Posted: Mon Apr 14, 2008 5:02 pm Post subject:

neysx · Retired Dev Joined: 27 Jan 2003 Posts: 795