[HEADSUP] Atlas changed libraries

Susi Lehtola jussilehtola at fedoraproject.org
Mon Sep 30 07:03:14 UTC 2013

On Sun, 29 Sep 2013 23:57:21 +0200
Kevin Kofler <kevin.kofler at chello.at> wrote:

> Susi Lehtola wrote:
> > On Sun, 29 Sep 2013 01:04:31 +0200
> > Kevin Kofler <kevin.kofler at chello.at> wrote:
> >> Susi Lehtola wrote:
> >> > If you link to -lblas, you're shooting yourself in the leg in the first
> >> > place, since that's the reference implementation on current Fedoras.
> >> 
> >> In fact, I noticed that, and that's a serious packaging bug.
> >> 
> >> If a package links -lblas -llapack, if ATLAS is installed, it'll get
> >> reference BLAS and ATLAS LAPACK! If it links -llapack -lblas, it'll
> >> probably get the ATLAS functions throughout, because then libatlas is
> >> resolved first. That's very unexpected and broken behavior.
> > 
> > No, you're assuming nonstandard behavior. ATLAS has never done this.
> I am describing the behavior that actually happens with the Fedora 18 (and I 
> presume 19 too) atlas-sse2 package!
> Try running ldd on LAPACK-using stuff, you'll see how the ATLAS liblapack is 
> picked up (but libblas is not overridden, which is a bug).

Yes, but everyone knows that if you want ATLAS, the link command is
 -L%{_libdir} -llapack -lf77blas -latlas
If you link to -lblas you're assuming nonstandard behavior. Fedora is
not Debian.

Nowadays this is just
 -L%{_libdir} -lsatlas
a much easier version.
Susi Lehtola
Fedora Project Contributor
jussilehtola at fedoraproject.org

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