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From: goarilla on 5 Mar 2010 11:16
Sylvain Robitaille wrote:
> Mikhail Zotov wrote:
>
>> There's a typo in the build script.
>
> This seems like a good time to suggest again that the target
> architecture is likely best auto-detected at build time, at least in the
> default cases, in Slackware's build scripts. Perhaps someone with some
> influence on those scripts (Eric? Robby?) could propose it at a higher
> level? In case it helps, in my own build scripts I use the following to
> determine the architecture I'm building on:
>
> ARCH=${ARCH:-`uname -m`}
>
> Nice, simple, and portable. It's followed shortly after with:
>
> case "$ARCH" in
> alpha) SLKCFLAGS="-O2 -m${MOPT}=ev4"
> LIBDIRSUFFIX="64"
> SLKLDFLAGS="-L/usr/lib${LIBDIRSUFFIX}";
> ;;
> i?86) SLKCFLAGS="-O2 -march=${ARCH} -m${MOPT}=${ARCH}"
> SLKLDFLAGS=""; LIBDIRSUFFIX=""
> ;;
> s390) SLKCFLAGS="-O2"
> SLKLDFLAGS=""; LIBDIRSUFFIX=""
> ;;
> powerpc) SLKCFLAGS="-O2"
> SLKLDFLAGS=""; LIBDIRSUFFIX=""
> ;;
> x86_64) SLKCFLAGS="-O2 -fPIC"
> LIBDIRSUFFIX="64"
> SLKLDFLAGS="-L/usr/lib${LIBDIRSUFFIX}";
> ;;
> athlon-xp) SLKCFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer"
> SLKLDFLAGS=""; LIBDIRSUFFIX=""
> ;;
> esac
>
> Which should look more or less familiar to those who have worked with
> these scripts from multiple sources (I didn't make the above up, I
> simply expanded it from other sources). This makes it *very* easy to
> create Slackware packages for various architectures without risking
> typos ...
>


out of curiousity why the explicit -fPIC compiler flag for
the 64 bit x86 arch ?
From: Henrik Carlqvist on 5 Mar 2010 14:19
"goarilla(a)work" <kevindotpaulus(a)mtmdotkuleuven.be> wrote:
> out of curiousity why the explicit -fPIC compiler flag for
> the 64 bit x86 arch ?

On x86_64 the flag -fPIC is needed when compiling object files that are
included in a shared library. On 32 bit x86 that flag is not needed. For
more information about what it does, see the man page for gcc.

regards Henrik
--
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From: Michael Black on 6 Mar 2010 15:53
On Thu, 4 Mar 2010, Juan Mª Santiago Burruchaga wrote:

> The packcage gnuplot-4.2.6-x86_64-1 is in the last ChangeLof for
> Slackware-current 32 bits.
>
>
And the March 6th changelog entry acknowledges this:
xap/gnuplot-4.2.6-i486-1.txz: Rebuilt.
This was compiled with the wrong $ARCH.
Thanks again to Mikhail Zotov for spotting the problem.

Michael
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