[HEADSUP] Atlas changed libraries

Kevin Kofler kevin.kofler at chello.at
Sun Sep 29 21:57:21 UTC 2013


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).

        Kevin Kofler



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