[Solved] where do I set machine architecture and flags?

frabato · 09-25-2009, 03:38 PM

Hi All,

I've been using slackware for about two days and I would like to compile some programs using sbopkg. Is there a global place that I can set machine architecture and flags that sbopkg will pick up? I've looked aroun but can't find anything.

Any help would be appreciated.

adriv · 09-25-2009, 04:05 PM

If you selected the package you want to build and install, you can select Custom --> Customize the .info or SlackBuild.

frabato · 09-25-2009, 05:09 PM

thanks for the reply. Yes, I see where these can be set but do I have to set them for each build or is there a place where they can be set globally?

slakmagik · 09-25-2009, 05:35 PM

The CFLAGS are plugged in from the SLKFLAGS and those are conditionally assigned due to the value of ARCH. ARCH can be exported from your ~/.bashrc or similar file or in the same command line as sbopkg (export ARCH=foo; sbopkg). However, this won't let you control specific CFLAGS - just which set of CFLAGS you get. For that, though I could be mistaken, I believe you'll have to edit the files individually (or sed them).

That said, your ARCH should be set correctly automatically and the compiler flags will either be the same as were used in compiling your base system or otherwise reasonably optimized. IOW, the defaults should be fine. I don't need to set my ARCH or mess with the flags.

So if you have an i686 and want to build packages that are optimized for i686 and won't run on anything else, export ARCH=i686 and otherwise, there shouldn't be much to do.

Is there anything specifically wrong with your ARCH or the CFLAGS that make you need to change things?

frabato · 09-25-2009, 06:56 PM

Thanks for that information. I'll be building several programs and I wanted them optimized for the intel 2.4 ghz quad core. This is a clean install and I don't have a ~/.bashrc at all.

gargamel · 09-26-2009, 02:20 AM

sbopkg usually detects machine architecture automatically.

But if you want, you can either modify the SlackBuild script or pass parameters to it. The latter is called "customise build process" or so (I don't have it on the machine I am sitting in front of). It's both possible from within sbopkg. So you can, e. g., specify ARCH=x86_64 as a command line parameter.

Then there's also a menu entry for saving the build queue. With this, the above settings will be saved, too, as far as I know.

The other method, using .bashrc or similar, would work, and may be a good idea, if you don't have sbopkg, but it's not necessary.

gargamel

sahko · 09-26-2009, 04:26 AM

There is a FAQ entry in slackbuilds.org http://slackbuilds.org/faq/#x86_64
That works also when you are not using sbopkg.

H_TeXMeX_H · 09-26-2009, 05:51 AM

Add something like this to your ~/.bashrc, create the file if it does not exist.

Here's my ~/.bashrc for example:

Code:

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

# CFLAGS
CHOST="x86_64"
export CFLAGS="-march=core2 -O2 -pipe -fPIC -msse4.1"
export CXXFLAGS="${CFLAGS}"

# PATH
export PATH="$PATH:/home/demonslayer/bin"
export MANPATH="$MANPATH:/home/demonslayer/lib/man"

frabato · 09-26-2009, 11:43 AM

Thanks very much, that's just what I was looking for.