Configuration my cflags

xavier · 2009-05-16 15:59:10

Hi,

i'm a new user of arch, i used gentoo and debian.

In first time i sorry for my bad english.

In second, i have a turion 64 x2 and I want to know how to set the flags for the file makepkg.conf in order to optimize the system.

I search in google and i found this url : http://wiki.archlinux.org/index.php/Safe_Cflags

but my architectures not exist.

Thank's very much .. and sorry for my english.

Ale

methuselah · 2009-05-16 16:03:29

xavier wrote:

Hi,
i'm a new user of arch, i used gentoo and debian.
In first time i sorry for my bad english.
In second, i have a turion 64 x2 and I want to know how to set the flags for the file makepkg.conf in order to optimize the system.
I search in google and i found this url : http://wiki.archlinux.org/index.php/Safe_Cflags
but my architectures not exist.
Thank's very much .. and sorry for my english.
Ale

I'm no expert.... but I use this for my Turion 64 x2 TL-60:

http://en.wikipedia.org/wiki/Turion_64_ … _nm_SOI.29
http://en.wikipedia.org/wiki/List_of_AM … 2890_nm.29

My CFLAGS:

CFLAGS="-march=athlon64-sse3 -O2 -pipe"
CXXFLAGS="-march=athlon64-sse3 -O2 -pipe"
#-- Make Flags: change this for DistCC/SMP systems
MAKEFLAGS="-j3"

and I add this to my PKGBUILDS for LDFLAGS:

export LDFLAGS="-Wl,--hash-style=gnu -Wl,--as-needed"

some links:
http://gcc.gnu.org/onlinedocs/gcc/i386- … 64-Options
http://gcc.gnu.org/onlinedocs/gcc-4.1.1 … tions.html
http://en.gentoo-wiki.com/wiki/CFLAGS
http://en.gentoo-wiki.com/wiki/Safe_Cfl … _.2F_Ultra

Last edited by methuselah (2009-05-16 16:11:09)

xavier · 2009-05-16 18:31:18

Thank for your post.. tommorow i try your option ..

because i try gentoo and i don't think the option in my make.conf file is enabled in makepkg.conf arch linux file.

thank you
ale

.:B:. · 2009-05-16 22:15:36

According to your wiki link Methusalemn --march=athlon64 is only for 64 bit systems. For 32 bit systems you still need to use --march=athlon.

At least, that's what that wiki page says .

skottish · 2009-05-16 22:26:29

Just use -march=native. GCC will pick the correct processor. From my makepkg.conf:

CFLAGS="-march=native -mtune=native -O2 -pipe"
CXXFLAGS="-march=native -mtune=native -O2 -pipe"

I've been told that the -mtune line is redundant.

methuselah · 2009-05-17 00:13:21

B wrote:

According to your wiki link Methusalemn --march=athlon64 is only for 64 bit systems. For 32 bit systems you still need to use --march=athlon.
At least, that's what that wiki page says .

@B - I'm not sure which link you're talking about. I have a 64bit system and the same Turion 64 x 2 that the opp xavier has so I just shared the settings that I use at the moment. I used the gcc gnu page: http://gcc.gnu.org/onlinedocs/gcc/i386- … 64-Options

@skottish - Would "-march=native" be able to tell that the Turion 64 x 2 has SSE3 available or would it just use the regular athlon64 or k8 setting that doesn't have the SSE3 instruction set support available? (I know just add -msse3)

I'm just wondering how the -march=native setting works..... if it uses SSE3 or not. I read in a few other threads that it just uses k8 or athlon64 (for my Turion 64 x 2).

I use to use "-march=athlon64 -msse3 -O2 -pipe" but then I switched it to "-march=athlon64-sse3 -O2 -pipe" since the gcc.gnu.org page said it was the improved versions of k8, opteron and athlon64 with SSE3 instruction set support. (also available k8-sse3, opteron-sse3)

Last edited by methuselah (2009-05-17 00:23:46)

skottish · 2009-05-17 00:54:14

methuselah wrote:

@skottish - Would "-march=native" be able to tell that the Turion 64 x 2 has SSE3 available or would it just use the regular athlon64 or k8 setting that doesn't have the SSE3 instruction set support available? (I know just add -msse3)
I'm just wondering how the -march=native setting works..... if it uses SSE3 or not. I read in a few other threads that it just uses k8 or athlon64 (for my Turion 64 x 2).

It's a little unclear to me whether GCC pulls in every option:

man_gcc wrote:

native
This selects the CPU to tune for at compilation time by
determining the processor type of the compiling machine. Using
-mtune=native will produce code optimized for the local machine
under the constraints of the selected instruction set. Using
-march=native will enable all instruction subsets supported by
the local machine (hence the result might not run on different
machines).

It's not as enlightening as I'd like it to be. It seems like it should compile using all CPU specific instructions.

xavier · 2009-05-17 12:13:55

in my gentoo file i use athlon-xp is possible used this flag also in arch linux file?

and other in makepkg.conf is possible used the INPUT_DEVICES and VIDEO_CARDS option to describe the other periperals of notebook?

And USE flag exist?

Ale

methuselah · 2009-05-17 17:17:27

xavier wrote:

in my gentoo file i use athlon-xp is possible used this flag also in arch linux file?
and other in makepkg.conf is possible used the INPUT_DEVICES and VIDEO_CARDS option to describe the other periperals of notebook?
And USE flag exist?
Ale

You are asking about your AMD Turion 64 x 2 processoer correct?

Which OS are you on? Arch i686 or Arch x86_64. (32bit or 64bit OS)

xavier · 2009-05-17 21:53:54

Yes, i asking for AMD Turion 64 x2 architecture.

in this moment i installed a 32 bit system.

I search install a minimal and essential system

methuselah · 2009-05-17 21:59:00

xavier wrote:

Yes, i asking for AMD Turion 64 x2 architecture.
in this moment i installed a 32 bit system.
I search install a minimal and essential system

I have no idea what cflags you should use for the Turion 64 x 2 on a 32bit system. Sorry.

.:B:. · 2009-05-18 05:37:01

methuselah wrote:

B wrote:
According to your wiki link Methusalemn --march=athlon64 is only for 64 bit systems. For 32 bit systems you still need to use --march=athlon.
At least, that's what that wiki page says .
@B - I'm not sure which link you're talking about. I have a 64bit system and the same Turion 64 x 2 that the opp xavier has so I just shared the settings that I use at the moment. I used the gcc gnu page: http://gcc.gnu.org/onlinedocs/gcc/i386- … 64-Options

My bad - I now see the link in your post was one you quoted, not provided yourself .

Xavier: you basically just need the K7 options for the K8 in 32 bit mode . You might want to add SSE3 support if your CPU does support it, but most of the time it's hardly worth it (it should be an additional gain for multimedia though). However, since there's not much to be compiled in general if you set up a minimal installation, isn't Gentoo worth looking into for you?

ammon · 2009-05-18 08:44:43

I use C2D with

CFLAGS="-march=core2 -msse3 -O2 -pipe"

Is that correct or

CFLAGS="-march=core2-msse3 -O2 -pipe"

bangkok_manouel · 2009-05-18 09:22:25

I'm surprised no one's using the new graphite branch loop optimizations:

-floop-interchange -floop-strip-mine -floop-block (See http://gcc.gnu.org/gcc-4.4/changes.html)

Using this since GCC4.4 was pushed in [TESTING], no build problems at all. Of course, the performance gain is >>!*HUGE*!<< but won't be noticed by any human being. ;-)

methuselah · 2009-05-18 11:57:36

bangkok_manouel wrote:

I'm surprised no one's using the new graphite branch loop optimizations:
-floop-interchange -floop-strip-mine -floop-block (See http://gcc.gnu.org/gcc-4.4/changes.html)
Using this since GCC4.4 was pushed in [TESTING], no build problems at all. Of course, the performance gain is >>!*HUGE*!<< but won't be noticed by any human being. ;-)

Thanks, I just added it to my makepkg.conf file. Any other tips?

Arch Linux

#1 2009-05-16 15:59:10

Configuration my cflags

#2 2009-05-16 16:03:29

Re: Configuration my cflags

#3 2009-05-16 18:31:18

Re: Configuration my cflags

#4 2009-05-16 22:15:36

Re: Configuration my cflags

#5 2009-05-16 22:26:29

Re: Configuration my cflags

#6 2009-05-17 00:13:21

Re: Configuration my cflags

#7 2009-05-17 00:54:14

Re: Configuration my cflags

#8 2009-05-17 12:13:55

Re: Configuration my cflags

#9 2009-05-17 17:17:27

Re: Configuration my cflags

#10 2009-05-17 21:53:54

Re: Configuration my cflags

#11 2009-05-17 21:59:00

Re: Configuration my cflags

#12 2009-05-18 05:37:01

Re: Configuration my cflags

#13 2009-05-18 08:44:43

Re: Configuration my cflags

#14 2009-05-18 09:22:25

Re: Configuration my cflags

#15 2009-05-18 11:57:36

Re: Configuration my cflags

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