On Mon, 2010-02-08 at 15:18 +0100, Axel Freyn wrote: > Hello Adam, > On Mon, Feb 08, 2010 at 08:39:50AM -0500, Adam C Powell IV wrote: > > Hello, > > > > Some time ago, the netlib and ATLAS implementations of BLAS and LAPACK > > were ABI-compatible, and used alternatives symlinks to access their > > different libraries with the same ABI. > > > > I don't know when it happened, but at some point they diverged, and now > > the netlib packages have libblas-3gf.so and liblapackgf-3.so, and ATLAS > > has libblas-3.so and liblapack-3.so. > If I remember correctly, that renaming was due to the compiler-update > from g77 to gfortran (which are NOT ABI-compatible!): Packages whose > names end with "gf" are supposed to be compiled and linked with > gfortran, while the older ones use g77. As this was a release goal for > Lenny, it should be finished by now - and also atlas should use now > gfortran, thus being again ABI-compatible with BLAS. That much I got... > > I know that ATLAS has its own API as well, but it was nice back in the > > day to be able to build to the netlib API, and then swap them back at > > forth at runtime using update-alternatives. > > > > Are they no longer ABI-compatible? Is it possible to get back to the > > old state of things? > Did you try to install the package "libatlas3gf-base"? Last time I checked > it on my machine (squeeze), it was no problem to switch between netlib > and atlas withour recompiling: just changing LD_LIBRARY_PATH to link to > the netlib-versions did the trick. And I have > /usr/lib/atlas/libblas.so.3gf which belongs to the package > "libatlas3gf-base". I have that package installed. I think I understand. So whereas there used to be an /etc/alternatives mechanism for selecting between netlib and ATLAS libraries, now one must use LD_LIBRARY_PATH. Makes sense. So the alternatives symlinks I mentioned above are now useless? Or do they need updating so they're at least consistent? Perhaps they should both link from libblas.so.3gf? -Adam -- GPG fingerprint: D54D 1AEE B11C CE9B A02B C5DD 526F 01E8 564E E4B6 Engineering consulting with open source tools http://www.opennovation.com/
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