INSTALLING THE blas LIBRARY

This document tells you how to build and install the blas library, and how
to build and run the tests for the library.  

TABLE OF CONTENTS
I.   Prerequisites
II.  Configuring
III. Building and Installing
IV.  Verifying the Installation
V.   Building and Running the Tests
VI.  Custom CBLAS Configurations


I. PREREQUISITES

Installing blas requires a working CBLAS to be installed on your system.  If you
do not have a CBLAS installed and you are not too concerned about performance,
probably the easiest one to install is the one that comes with the GNU 
Scientific Library (GSL), available at http://www.gnu.org/software/gsl/.  If
you care about performance, a better option is to use ATLAS, available at
http://math-atlas.sourceforge.net/.  Other options include the Goto BLAS and
Intel's MKL library.  If you are running Mac OS X, you can use vecLib, which
is part of the Accelerate framework.


II. CONFIGURING

To configure blas, first decide which CBLAS you want to link to and figure out
the appropriate flag.  The default flags are as follows:

    CBLAS Vendor                                 Flag
    ------------------------------------------------------
    ATLAS                                        -fatlas
    GSL                                          -fgsl
    Intel MKL                                    -fmkl
    vecLib                                       -fveclib
    Other vendor or non-standard installation    -fcustom
    
Now, run the command "runhaskell Setup.lhs configure" with the appropriate 
flag.  For example, to link with ATLAS, you would run the command:

# runhaskell Setup.lhs configure -fatlas

You can also pass additional arguments to the configure script.  To see a full
list, do "runhaskell Setup.lhs configure --help".  If you do not pass a flag
to the configure script, ATLAS is used by default.  Do not try passing more than
one CBLAS flag to the script.


III. BUILDING AND INSTALLING

To build the library, execute the command

# runhaskell Setup.lhs build

To build the haddock documentation, run

# runhaskell Setup.lhs haddock

Lastly, to install the library, do

# runhaskell Setup.lhs install


IV. VERIFYING THE INSTALLATION

Once you have installed blas, try running the command "ghci -package blas".  You
should not get any "unknown symbol" errors.


V. BUILDING AND RUNNING THE TESTS

If you have verified that blas is installed correctly, you can try building and
running the tests.  These are in the "tests" directory, and are in the form of
QuickCheck properties.  To build and run them, just run "make" in the tests
directory.


VI. CUSTOM CBLAS CONFIGURATIONS

If your CBLAS is not one of the defaults listed above or it is not installed in
a standard location, you need to edit the blas.cabal file to tell the 
installation script where it lives.  At the end of the file, you will see the
following lines:

    if flag(custom)
        -- CUSTOM CBLAS LIBS GO HERE
        extra-libraries:    
        
        -- PATH TO CUSTOM LIB DIR GOES HERE 
        extra-lib-dirs:     
    
You need to fill in the names and locations of your CBLAS libraries.  If your
CBLAS is in a library with dependencies, make sure you list the dependencies
*after* the libraries that depend on them.    

Once you have edited blas.cabal, build and install as normal, using the 
"-fcustom" flag when you configure the library.