(octave.info)Compiling Octave with 64-bit Indexing

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E.3 Compiling Octave with 64-bit Indexing
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Note: the following only applies to systems that have 64-bit pointers.
Configuring Octave with ‘--enable-64’ cannot magically make a 32-bit
system have a 64-bit address space.

   On 64-bit systems, Octave uses 64-bit integers for indexing arrays by
default.  If the configure script determines that your BLAS library uses
32-bit integers, then operations using the following libraries are
limited to arrays with dimensions that are smaller than 2^{31} elements:

   • BLAS

   • LAPACK

   • QRUPDATE

   • SuiteSparse

   • ARPACK

   Additionally, the following libraries use ‘int’ internally, so
maximum problem sizes are always limited:

   • GLPK

   • Qhull

   Except for GLPK and Qhull, these libraries may also be configured to
use 64-bit integers, but most systems do not provide packages built this
way.  If you wish to experiment with large arrays, the following
information may be helpful.

   The following instructions were tested with the development version
of Octave and GCC 4.3.4 on an x86_64 Debian system and may be out of
date now.  Please report any problems or corrections on the Octave bug
tracker.

   The versions listed below are the versions used for testing.  If
newer versions of these packages are available, you should try to use
them, although there may be some differences.

   All libraries and header files will be installed in subdirectories of
‘$prefix64’ (you must choose the location of this directory).

   • BLAS and LAPACK (<http://www.netlib.org/lapack>)

     Reference versions for both libraries are included in the reference
     LAPACK 3.2.1 distribution from <netlib.org>.

        − Copy the file ‘make.inc.example’ and name it ‘make.inc’.  The
          options ‘-fdefault-integer-8’ and ‘-fPIC’ (on 64-bit CPU) have
          to be added to the variable ‘OPTS’ and ‘NOOPT’.

        − Once you have compiled this library make sure that you use it
          for compiling Suite Sparse and Octave.  In the following we
          assume that you installed the LAPACK library as
          $prefix64/lib/liblapack.a.

   • QRUPDATE (<https://sourceforge.net/projects/qrupdate>)

     In the ‘Makeconf’ file:

        − Add ‘-fdefault-integer-8’ to ‘FFLAGS’.

        − Adjust the BLAS and LAPACK variables as needed if your 64-bit
          aware BLAS and LAPACK libraries are in a non-standard
          location.

        − Set ‘PREFIX’ to the top-level directory of your install tree.

        − Run ‘make solib’ to make a shared library.

        − Run ‘make install’ to install the library.

   • SuiteSparse (<http://faculty.cse.tamu.edu/davis/suitesparse.html>)

     Pass the following options to ‘make’ to enable 64-bit integers for
     BLAS library calls.  On 64-bit Windows systems, use
     ‘-DLONGBLAS="long long"’ instead.

          CFLAGS='-DLONGBLAS=long'
          CXXFLAGS='-DLONGBLAS=long'

     The SuiteSparse makefiles don’t generate shared libraries.  On some
     systems, you can generate them by doing something as simple as

          top=$(pwd)
          for f in *.a; do
            mkdir tmp
            cd tmp
            ar vx ../$f
            gcc -shared -o ../${f%%.a}.so *.o
            cd $top
            rm -rf tmp
          done

     Other systems may require a different solution.

   • ARPACK (<https://forge.scilab.org/index.php/p/arpack-ng/>)

        − Add ‘-fdefault-integer-8’ to ‘FFLAGS’ when running configure.

        − Run ‘make’ to build the library.

        − Run ‘make install’ to install the library.

   • ATLAS instead of reference BLAS and LAPACK

     Suggestions on how to compile ATLAS would be most welcome.

   • GLPK

   • Qhull (<http://www.qhull.org>)

     Both GLPK and Qhull use ‘int’ internally so maximum problem sizes
     may be limited.

   • Octave

     Octave’s 64-bit index support is activated with the configure
     option ‘--enable-64’.

          ./configure \
            LD_LIBRARY_PATH="$prefix64/lib" \
            CPPFLAGS="-I$prefix64/include" LDFLAGS="-L$prefix64/lib" \
            --enable-64

     You must ensure that all Fortran sources except those in the
     ‘liboctave/external/ranlib’ directory are compiled such that
     INTEGERS are 8-bytes wide.  If you are using gfortran, the
     configure script should automatically set the Makefile variable
     ‘F77_INTEGER_8_FLAG’ to ‘-fdefault-integer-8’.  If you are using
     another compiler, you must set this variable yourself.  You should
     NOT set this flag in ‘FFLAGS’, otherwise the files in
     ‘liboctave/external/ranlib’ will be miscompiled.

   • Other dependencies

     Probably nothing special needs to be done for the following
     dependencies.  If you discover that something does need to be done,
     please submit a bug report.

        − pcre

        − zlib

        − hdf5

        − fftw3

        − cURL

        − GraphicsMagick++

        − OpenGL

        − freetype

        − fontconfig

        − fltk