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#1 (**permalink**) 02-19-2008, 01:39 PM

I know there's a file in /etc for gentoo that lets one keep their
cflags settings stored so they don't have to keep on manually
entering them each time they want to compile a new program. I also
know that I did something like this once in Slack, but I just don't
remember how to do it now (had to reformat, System Tools apparently
doesn't like to properly resize ReiserFS partitions....)

Anyway, what I've done so far is creat a file called ~/.bash_profile
for one of my users, and here's what's in that file:

CHOST="i686-pc-linux-gnu"
CFLAGS="-march=pentium4 -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="march=pentium4 -O3 -pipe -fomit-frame-pointer"
export CHOST
export CFLAGS
export CXXFLAGS

since I'm on a P4 computer, I'm trying to optimize this puppy for my
architecture. Now is there anything else I have to do? Keep in mind
that all I've done is create this file, nothing more.

Thanks for the help

#2 (**permalink**) 02-19-2008, 01:39 PM

You could stick these in /etc/profile and they'll be available to anyone
who logs in, always.

r_jensen11 wrote:

>I know there's a file in /etc for gentoo that lets one keep their
>cflags settings stored so they don't have to keep on manually
>entering them each time they want to compile a new program. I also
>know that I did something like this once in Slack, but I just don't
>remember how to do it now (had to reformat, System Tools apparently
>doesn't like to properly resize ReiserFS partitions....)
>
>Anyway, what I've done so far is creat a file called ~/.bash_profile
>for one of my users, and here's what's in that file:
>
>CHOST="i686-pc-linux-gnu"
>CFLAGS="-march=pentium4 -O3 -pipe -fomit-frame-pointer"
>CXXFLAGS="march=pentium4 -O3 -pipe -fomit-frame-pointer"
>export CHOST
>export CFLAGS
>export CXXFLAGS
>
>since I'm on a P4 computer, I'm trying to optimize this puppy for my
>architecture. Now is there anything else I have to do? Keep in mind
>that all I've done is create this file, nothing more.
>
>Thanks for the help
>
>
>

#3 (**permalink**) 02-19-2008, 01:40 PM

On 11 Aug 2004 18:12:43 -0500, r_jensen11@yahoo-dot-com.no-spam.invalid wrote:

> CHOST="i686-pc-linux-gnu"

Do you really have a toolchain called this or do you have i486-slackware-linux?
In most configure scripts they will work out that what you have specified is crap
and will default to using the generic tool names, but you won't be lucky all
of the time.

> CFLAGS="-march=pentium4 -O3 -pipe -fomit-frame-pointer"

There is a reason -O3 isn't used everywhere - it's because sometimes it causes
the compiler to crash (although IME this usually happens when building for
non x86). When Patrick considers -O3 'safe' for a particular piece of software
he uses it.

--
Stuart Winter
www.interlude.org.uk & www.armedslack.org

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Storing CFLAGS and other compiler settings in Slackware