From octave-sources-request at bevo dot che dot wisc dot edu  Sat Feb  5 19:21:18 2000
Subject: patch to make octave check for ATLAS BLAS libs, etcetera
From: stevenj at gil-galad dot mit dot edu
To: octave-sources at bevo dot che dot wisc dot edu
Cc: rwhaley at cs dot utk dot edu
Date: Sat, 5 Feb 2000 20:23:25 -0500 (EST)

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Dear Octave Users and Developers,

I have attached below a patch (made by cvs diff -u against the latest
source tree) to make Octave check for preexisting/accelerated BLAS and
LAPACK libraries on the user's system before building its own.  This will
both dramatically increase performance (if an accelerated BLAS like ATLAS
is available) and decrease the compilation time.  (It will also save disk
space, if the installed BLAS/LAPACK are shared libraries, and take
advantage of updated libraries--e.g. LAPACK 3.0 works fine with Octave as
far as I can tell on my machine.)

The main modifications are to the configure.in file (whence the configure
script), and are based upon similar checks I performed in other (free)
programs of mine (MPB, http://ab-initio.mit.edu/mpb/, and benchFFT,
http://www.fftw.org/benchfft/).

The patched configure script will check for a pre-installed BLAS library
in the following order: ATLAS, CXML/DXML (Compaq extended math library),
the Sun performance library, the SGI/Cray SCSL library, the SGImath
library, the IBM ESSL library, and finally the generic BLAS library
-lblas.  If any of these are found, it will also check for a LAPACK
library installed on the system (under -llapack, and also directly in one
of the already-included libraries).

If no library is found (or if --without-fastblas is passed to configure),
then the bundled BLAS and/or LAPACK libraries will be built as usual in
libcruft.  Otherwise, only the 4 files from the (new)
directories libcruft/blas-xtra and libcruft/lapack-xtra are built.  The
former contains the modified xerbla.f used in Octave; and the latter
contain the x*.f files from the old lapack/ directory, which are actually
not from the original LAPACK (they convert a few LAPACK functions into
subroutines).

There is a slight hack to make sure the modified xerbla.f is used in
preference to any xerbla in the external BLAS libraries: I inserted a
dummy call to it (never reached) in the octave main().  Something like
this is necessary because libcruft.a is linked before the external LAPACK
and BLAS, which would otherwise be the only things to call xerbla and thus
the libcruft xerbla would be dropped.

The attached archive contains not only the patch (in diff.out), but also
the new blas-xtra/ and lapack-xtra/ directories, which should be added
under the libcruft/ directory.

Please let me know if you have any comments or questions.

Cordially,
Steven G. Johnson

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