Re: [gentoo-user] Re: GCC-4.3.2

[Joseph <syscon780@gmail.com>]

On 04/06/09 11:56, Nikos Chantziaras wrote:

[snip]
>>> ~adj~
>> I just notice that there is a problem with CFLAGS -march=native on AMD64
>> I recompile my system using this new flag and have a lot of problems. an 
>> examples new xorg-server-1.5... would not compile, I switch back to my 
>> previous settings:
>> -march=athlon64 and it compiled on first pass.
>> So, now I'm recompiling the system with my old flag: -march=athlon64 :-/
>
> -march=native is only useful if you don't know what to use.  I guess most 
> Gentoo users do know what to use.  Why should I use "native" if I know that 
> my CPU is "athlon64" :P

Well, according to gentoo recommendations it is not so:
http://en.gentoo-wiki.com/wiki/Safe_Cflags
"...GCC 4.2 introduces a new -march option, -march=native, which automatically detects the features your CPU supports and sets the options appropriately. 
If you have an Intel or AMD CPU and are using >=sys-devel/gcc-4.2.3, using -march=native is recommended...."

So, I suggest you make a correction to gentoo-wiki, as I suspect I'll will not be the only one who get confused by it :-/

-- 
Joseph