Re: [gentoo-user] CFlags for CPU

[Kfir Lavi <lavi.kfir@gmail.com>]

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On Wed, Jul 27, 2011 at 5:09 PM, Andy Wilkinson <drukargin@gmail.com> wrote:

> **
> On 07/26/2011 12:22 PM, pk wrote:
>
> On 2011-07-26 22:36, Alokat wrote:
>
>
>  model name      : Intel(R) Core(TM)2 Duo CPU     L7100  @ 1.20GHz
>
>  <snip>
>
>
>  I guess *core2* is the right one?
>
>  Yes, acc. to:http://en.gentoo-wiki.com/wiki/Safe_Cflags/Intel#Core_2_Duo.2FQuad.2C_Xeon_51xx.2F53xx.2F54xx.2F3360.2C_Pentium_Dual-Core_T23xx.2B.2FExxxx.2C_Celeron_Dual-Core
>
> HTH
>
> Best regards
>
> Peter K
>
>
>  Another good trick I've found on the forums is to run:
>
> $ gcc -### -e -v -march=native /usr/include/stdlib.h
>
> The last line of output will include the various CFLAGS that -march=native
> picks.  In my case (Phenom II 955):
>
>  "/usr/libexec/gcc/x86_64-pc-linux-gnu/4.4.5/cc1" "-quiet"
> "/usr/include/stdlib.h" "-D_FORTIFY_SOURCE=2" *"-march=amdfam10" "-mcx16"
> "-msahf" "-mpopcnt"* "--param" "l1-cache-size=64" "--param"
> "l1-cache-line-size=64" "--param" "l2-cache-size=512" "-mtune=amdfam10"
> "-quiet" "-dumpbase" "stdlib.h" "-auxbase" "stdlib" "-o" "/tmp/ccR1PlNZ.s"
> "--output-pch=/usr/include/stdlib.h.gch"
>
> I typically use -march=native when I don't need to worry about distcc, or
> the options from that output that start with "-m".
>
> -Andy
>
I must stay, this is brilliant !
Thank you very much.

Kfir

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