On Sun, 29 Sep 2013 23:57:21 +0200
Kevin Kofler <kevin.kofler(a)chello.at> wrote:
Susi Lehtola wrote:
> On Sun, 29 Sep 2013 01:04:31 +0200
> Kevin Kofler <kevin.kofler(a)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(a)fedoraproject.org