Re: Packaging lapack, blas, etc

[Reini Urban <rurban at x-ray dot at>]

James R. Phillips schrieb:
> I am looking at packaging numerical libraries such as lapack and blas for use
> by a cygwin version of gnu octave.  I would like some guidance on a couple
> issues:

I would a bit with a release until the gcc-3.4 dwarf2 EH problems 
(performance degradation with new libstdc++ exceptions) are settled. 
Shouldn't be that far anymore.
See the octave or gcc list on known octave issues.
  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14563
  http://sources.redhat.com/ml/cygwin/2004-11/msg00007.html

> 1) I anticipate developing the libraries in a dll format, and there may be
> multiple versions, optimized for different processor architecture.  What is the
> best way to support (ie select from) multiple installed library versions at run
> time?  Simply make certain the correct version is copied to /usr/bin, or add
> the path to the correct version to the $PATH environmental string?  Or
> something else?

To /usr/bin if you depend on them on startup.
However as it looks like, if you demand-load (dlopen) them later after 
doing some cpu detection, you can put them anywhere, preferably into 
/usr/lib/<package> or /usr/libexec/<package>
--
Reini Urban
http://xarch.tu-graz.ac.at/home/rurban/