~fluidity-core/fluidity/doodson

dnl @synopsis ACX_BLAS([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
dnl
dnl This macro looks for a library that implements the BLAS
dnl linear-algebra interface (see http://www.netlib.org/blas/).
dnl On success, it sets the BLAS_LIBS output variable to
dnl hold the requisite library linkages.
dnl
dnl To link with BLAS, you should link with:
dnl
dnl 	$BLAS_LIBS $LIBS $FCLIBS
dnl
dnl in that order.  FCLIBS is the output variable of the
dnl AC_FC_LIBRARY_LDFLAGS macro (called if necessary by ACX_BLAS),
dnl and is sometimes necessary in order to link with FC libraries.
dnl Users will also need to use AC_FC_DUMMY_MAIN (see the autoconf
dnl manual), for the same reason.
dnl
dnl Many libraries are searched for, from ATLAS to CXML to ESSL.
dnl The user may also use --with-blas=<lib> in order to use some
dnl specific BLAS library <lib>.  In order to link successfully,
dnl however, be aware that you will probably need to use the same
dnl Fortran compiler (which can be set via the FC env. var.) as
dnl was used to compile the BLAS library.
dnl
dnl ACTION-IF-FOUND is a list of shell commands to run if a BLAS
dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands
dnl to run it if it is not found.  If ACTION-IF-FOUND is not specified,
dnl the default action will define HAVE_BLAS.
dnl
dnl This macro requires autoconf 2.50 or later.
dnl
dnl @version $Id$
dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
dnl
dnl Modified by Jonas Juselius <jonas@iki.fi>
dnl
AC_DEFUN([ACX_BLAS], [
AC_PREREQ(2.59)

acx_blas_ok=no
acx_blas_save_LIBS="$LIBS"
acx_blas_save_LDFLAGS="$LDFLAGS"
acx_blas_save_FFLAGS="$FFLAGS"
acx_blas_libs=""
acx_blas_dir=""

AC_ARG_WITH(blas,
	[AC_HELP_STRING([--with-blas=<lib>], [use BLAS library <lib>])])

case $with_blas in
	yes | "") ;;
	no) acx_blas_ok=disable ;;
	-l* | */* | *.a | *.so | *.so.* | *.o) acx_blas_libs="$with_blas" ;;
	*) acx_blas_libs="-l$with_blas" ;;
esac

AC_ARG_WITH(blas_dir,
	[AC_HELP_STRING([--with-blas-dir=<dir>], [look for BLAS library in <dir>])])

case $with_blas_dir in
      yes | no | "") ;;
     -L*) LDFLAGS="$LDFLAGS $with_blas_dir" 
	      acx_blas_dir="$with_blas_dir" ;;
      *) LDFLAGS="$LDFLAGS -L$with_blas_dir" 
	      acx_blas_dir="-L$with_blas_dir" ;;
esac

# Are we linking from C?
case "$ac_ext" in
  f*|F*) sgemm="sgemm" ;;
  *)
   AC_FC_FUNC([sgemm])
   LIBS="$LIBS $FCLIBS"
   ;;
esac

# If --with-blas is defined, then look for THIS AND ONLY THIS blas lib
if test $acx_blas_ok = no; then
case $with_blas in
    ""|yes) ;;
	*) save_LIBS="$LIBS"; LIBS="$acx_blas_libs $LIBS"
	AC_MSG_CHECKING([for $sgemm in $acx_blas_libs])
	AC_TRY_LINK_FUNC($sgemm, [acx_blas_ok=yes])
	AC_MSG_RESULT($acx_blas_ok)
	LIBS="$save_LIBS"
	acx_blas_ok=specific
	;;
esac
fi

# First, check BLAS_LIBS environment variable
if test $acx_blas_ok = no; then
if test "x$BLAS_LIBS" != x; then
	save_LIBS="$LIBS"; LIBS="$BLAS_LIBS $LIBS"
	AC_MSG_CHECKING([for $sgemm in $BLAS_LIBS])
	AC_TRY_LINK_FUNC($sgemm, [acx_blas_ok=yes; acx_blas_libs=$BLAS_LIBS])
	AC_MSG_RESULT($acx_blas_ok)
	LIBS="$save_LIBS"
fi
fi

# BLAS linked to by default?  (happens on some supercomputers)
if test $acx_blas_ok = no; then
	AC_MSG_CHECKING([for builtin $sgemm])
	AC_TRY_LINK_FUNC($sgemm, [acx_blas_ok=yes])
	AC_MSG_RESULT($acx_blas_ok)
fi

# Intel mkl BLAS. Unfortunately some of Intel's blas routines are
# in their lapack library...
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(mkl_def, $sgemm, 
	[acx_blas_ok=yes; acx_blas_libs="-lmkl_def -lm"],
	[],[-lm])
fi
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(mkl_ipf, $sgemm, 
	[acx_blas_ok=yes; acx_blas_libs="-lmkl_ipf -lguide -lm"],
	[],[-lguide -lm])
fi
if test $acx_blas_ok = no; then
        AC_CHECK_LIB(mkl_em64t, $sgemm,
        [acx_blas_ok=yes; acx_blas_libs="-lmkl_em64t -lguide -liomp5"],
        [],[-lguide -liomp5])
fi
# check for older mkl
if test $acx_blas_ok = no; then
	AC_MSG_NOTICE([trying Intel MKL < 7:])
	unset ac_cv_lib_mkl_def_sgemm
	AC_CHECK_LIB(mkl_lapack, lsame, [
	    acx_lapack_ok=yes;
		AC_CHECK_LIB(mkl_def, $sgemm, 
			[acx_blas_ok=yes; 
			acx_blas_libs="-lmkl_def -lmkl_lapack -lm -lpthread"],
			[],[-lm -lpthread
		])
	])
	AC_MSG_NOTICE([Intel MKL < 7... $acx_blas_ok])
fi

# BLAS in ACML (pgi)
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(acml, $sgemm, [acx_blas_ok=yes; acx_blas_libs="-lacml"])
fi

# BLAS in ATLAS library? (http://math-atlas.sourceforge.net/)
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(f77blas, $sgemm,
		[acx_blas_ok=yes; acx_blas_libs="-lf77blas -latlas"],
		[], [-latlas])
fi

# ia64-hp-hpux11.22 BLAS library?
if test $acx_blas_ok = no; then
        AC_CHECK_LIB(veclib, $sgemm, 
		[acx_blas_ok=yes; acx_blas_libs="-lveclib8"])
fi

# BLAS in PhiPACK libraries? (requires generic BLAS lib, too)
if test $acx_blas_ok = no; then
    AC_MSG_NOTICE([trying PhiPACK:])
	AC_CHECK_LIB(blas, $sgemm,
		[AC_CHECK_LIB(dgemm, dgemm,
			[AC_CHECK_LIB(sgemm, $sgemm,
			[acx_blas_ok=yes; acx_blas_libs="-lsgemm -ldgemm -lblas"],
			[], [-lblas])],
		[], [-lblas])
	])
    AC_MSG_NOTICE([PhiPACK... $acx_blas_ok])
fi

# BLAS in Alpha CXML library?
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(cxml, $sgemm, [acx_blas_ok=yes;acx_blas_libs="-lcxml"])
fi

# BLAS in Alpha DXML library? (now called CXML, see above)
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(dxml, $sgemm, [acx_blas_ok=yes;acx_blas_libs="-ldxml"])
fi

# BLAS in Sun Performance library?
if test $acx_blas_ok = no; then
	if test "x$GCC" != xyes; then # only works with Sun CC
		AC_CHECK_LIB(sunmath, acosp,
			[AC_CHECK_LIB(sunperf, $sgemm,
        			[acx_blas_libs="-xlic_lib=sunperf -lsunmath"
                    acx_blas_ok=yes],[],[-lsunmath])
		])
	fi
fi

# BLAS in SCSL library?  (SGI/Cray Scientific Library)
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(scs, $sgemm, [acx_blas_ok=yes; acx_blas_libs="-lscs"])
fi

# BLAS in SGIMATH library?
if test $acx_blas_ok = no; then
	AC_CHECK_LIB(complib.sgimath, $sgemm,
		     [acx_blas_ok=yes; acx_blas_libs="-lcomplib.sgimath"])
fi

# BLAS in IBM ESSL library? (requires generic BLAS lib, too)
if test $acx_blas_ok = no; then
    unset ac_cv_lib_blas_sgemm
	AC_MSG_NOTICE([trying IBM ESSL:])
	AC_CHECK_LIB(blas, $sgemm,
		[AC_CHECK_LIB(essl, $sgemm,
			[acx_blas_ok=yes; acx_blas_libs="-lessl -lblas"],
			[], [-lblas])
	])
	AC_MSG_NOTICE([IBM ESSL... $acx_blas_ok])
fi

# Generic BLAS library?
if test $acx_blas_ok = no; then
    unset ac_cv_lib_blas_sgemm
	AC_CHECK_LIB(blas, $sgemm, [acx_blas_ok=yes; acx_blas_libs="-lblas"])
fi

# blas on SGI/CRAY 
if test $acx_blas_ok = no; then
    unset ac_cv_lib_blas_sgemm
	AC_CHECK_LIB(blas, $sgemm, 
	[acx_blas_ok=yes; acx_blas_libs="-lblas -lcraylibs"],[],[-lcraylibs])
fi

# Check for vecLib framework (Darwin)
if test $acx_blas_ok = no; then
	save_LIBS="$LIBS"; LIBS="-framework vecLib $LIBS"
	AC_MSG_CHECKING([for $sgemm in vecLib])
	AC_TRY_LINK_FUNC($sgemm, [acx_blas_ok=yes; acx_blas_libs="-framework vecLib"])
	AC_MSG_RESULT($acx_blas_ok)
	LIBS="$save_LIBS"
fi
 
BLAS_LIBS="$acx_blas_libs"
AC_SUBST(BLAS_LIBS)

LIBS="$acx_blas_save_LIBS"
LDFLAGS="$acx_blas_save_LDFLAGS $acx_blas_dir"

test x"$acx_blas_ok" = xspecific && acx_blas_ok=yes
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_blas_ok" = xyes; then
        ifelse([$1],,AC_DEFINE(HAVE_BLAS,1,[Define if you have a BLAS library.]),[$1])
        :
else
        acx_blas_ok=no
        $2
fi
])dnl ACX_BLAS

dnl @synopsis ACX_LAPACK([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
dnl
dnl This macro looks for a library that implements the LAPACK
dnl linear-algebra interface (see http://www.netlib.org/lapack/).
dnl On success, it sets the LAPACK_LIBS output variable to
dnl hold the requisite library linkages.
dnl
dnl To link with LAPACK, you should link with:
dnl
dnl 	$LAPACK_LIBS $BLAS_LIBS $LIBS 
dnl
dnl in that order.  BLAS_LIBS is the output variable of the ACX_BLAS
dnl macro, called automatically.  FLIBS is the output variable of the
dnl AC_F77_LIBRARY_LDFLAGS macro (called if necessary by ACX_BLAS),
dnl and is sometimes necessary in order to link with F77 libraries.
dnl Users will also need to use AC_F77_DUMMY_MAIN (see the autoconf
dnl manual), for the same reason.
dnl
dnl The user may also use --with-lapack=<lib> in order to use some
dnl specific LAPACK library <lib>.  In order to link successfully,
dnl however, be aware that you will probably need to use the same
dnl Fortran compiler (which can be set via the F77 env. var.) as
dnl was used to compile the LAPACK and BLAS libraries.
dnl
dnl ACTION-IF-FOUND is a list of shell commands to run if a LAPACK
dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands
dnl to run it if it is not found.  If ACTION-IF-FOUND is not specified,
dnl the default action will define HAVE_LAPACK.
dnl
dnl @version $Id$
dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
dnl
AC_DEFUN([ACX_LAPACK], [
AC_REQUIRE([ACX_BLAS])
acx_lapack_ok=no
acx_lapack_save_LIBS="$LIBS"
acx_lapack_save_LDFLAGS="$LDFLAGS"
acx_lapack_save_FFLAGS="$FFLAGS"
acx_lapack_libs=""
acx_lapack_dir=""

AC_ARG_WITH(lapack,
	[AC_HELP_STRING([--with-lapack=<lib>], [use LAPACK library <lib>])])

case $with_lapack in
	yes | "") ;;
	no) acx_lapack_ok=disable ;;
	-l* | */* | *.a | *.so | *.so.* | *.o) acx_lapack_libs="$with_lapack" ;;
	*) acx_lapack_libs="-l$with_lapack" ;;
esac

AC_ARG_WITH(lapack_dir,
	[AC_HELP_STRING([--with-lapack-dir=<dir>], [look for LAPACK library in <dir>])])

case $with_lapack_dir in
      yes | no | "") ;;
     -L*) LDFLAGS="$LDFLAGS $with_lapack_dir" 
	      acx_lapack_dir="$with_lapack_dir" ;;
      *) LDFLAGS="$LDFLAGS -L$with_lapack_dir" 
	      acx_lapack_dir="-L$with_lapack_dir" ;;
esac

# We cannot use LAPACK if BLAS is not found
if test "x$acx_blas_ok" != xyes; then
	acx_lapack_ok=noblas
fi

# add BLAS to libs
LIBS="$BLAS_LIBS $LIBS"

# Are we linking from C?
case "$ac_ext" in
  f*|F*) dsyev="dsyev" ;;
  *)
   AC_FC_FUNC([dsyev])
   LIBS="$LIBS $FCLIBS"
   ;;
esac

# If --with-lapack is defined, then look for THIS AND ONLY THIS lapack lib
if test $acx_lapack_ok = no; then
case $with_lapack in
    ""|yes) ;;
	*) save_LIBS="$LIBS"; LIBS="$acx_lapack_libs $LIBS"
	AC_MSG_CHECKING([for $dsyev in $acx_lapack_libs])
	AC_TRY_LINK_FUNC($dsyev, [acx_lapack_ok=yes])
	AC_MSG_RESULT($acx_lapack_ok)
	LIBS="$save_LIBS"
	acx_lapack_ok=yes
	;;
esac
fi

# First, check LAPACK_LIBS environment variable
if test $acx_lapack_ok = no; then
if test "x$LAPACK_LIBS" != x; then
	save_LIBS="$LIBS"; LIBS="$LAPACK_LIBS $LIBS"
	AC_MSG_CHECKING([for $dsyev in $LAPACK_LIBS])
	AC_TRY_LINK_FUNC($dsyev, [acx_lapack_ok=yes; 
	     acx_lapack_libs=$LAPACK_LIBS])
	AC_MSG_RESULT($acx_lapack_ok)
	LIBS="$save_LIBS"
fi
fi

# Intel MKL LAPACK?
if test $acx_lapack_ok = no; then
	AC_CHECK_LIB(mkl_lapack, $dsyev, 
	[acx_lapack_ok=yes; acx_lapack_libs="-lmkl_lapack -lguide"],
	[],[])
fi

# Sun sunperf?
if test $acx_lapack_ok = no; then
	AC_CHECK_LIB(sunperf, $dsyev, 
	[acx_lapack_ok=yes; acx_lapack_libs="-lsunperf"],
	[],[])
fi

# LAPACK linked to by default?  (is sometimes included in BLAS lib)
if test $acx_lapack_ok = no; then
	AC_MSG_CHECKING([for $dsyev in BLAS library])
	AC_TRY_LINK_FUNC($dsyev, [acx_lapack_ok=yes; acx_lapack_libs=""])
	AC_MSG_RESULT($acx_lapack_ok)
fi

# Generic LAPACK library?
if test $acx_lapack_ok = no; then
	AC_CHECK_LIB(lapack, $dsyev,
		[acx_lapack_ok=yes; acx_lapack_libs="-llapack"], [], [])
fi

LAPACK_LIBS="$LAPACK_LIBS $acx_lapack_libs"
LIBS="$acx_lapack_save_LIBS"
LDFLAGS="$acx_lapack_save_LDFLAGS $acx_lapack_dir"

AC_SUBST(LAPACK_LIBS)

# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_lapack_ok" = xyes; then
        ifelse([$1],,AC_DEFINE(HAVE_LAPACK,1,[Define if you have LAPACK library.]),[$1])
        :
else
        acx_lapack_ok=no
        $2
fi
])dnl ACX_LAPACK
dnl ----------------------------------------------------------------------------
dnl check for the required PETSc library
dnl ----------------------------------------------------------------------------
AC_DEFUN([ACX_PETSc], [
AC_REQUIRE([ACX_BLAS])
AC_REQUIRE([ACX_ParMetis])
BLAS_LIBS="$BLAS_LIBS $FLIBS"
AC_REQUIRE([ACX_LAPACK])
LAPACK_LIBS="$LAPACK_LIBS $BLAS_LIBS"
AC_PATH_XTRA

if test "x$PETSC_DIR" == "x"; then
  AC_MSG_WARN( [No PETSC_DIR set - do you need to load a petsc module?] )
  AC_MSG_ERROR( [You need to set PETSC_DIR to point at your PETSc installation... exiting] )
fi



PETSC_LINK_LIBS=`make -s -f petsc_makefile getlinklibs`
LIBS="$LIBS $PETSC_LINK_LIBS"

PETSC_INCLUDE_FLAGS=`make -s -f petsc_makefile getincludedirs`
CPPFLAGS="$CPPFLAGS $PETSC_INCLUDE_FLAGS"
FCFLAGS="$FCFLAGS $PETSC_INCLUDE_FLAGS"

# Horrible hacks needed for cx1
# Somehow /apps/intel/ict/mpi/3.1.038/lib64 gets given as /apps/intel/ict/mpi/3.1.038/lib/64
# maybe the directory got moved after building petsc? Anyhow next time we
# request a new petsc package on cx1, this hack can be removed - and we
# can check if the new packages passes the test without any hacks.
fixedLIBS=`echo $LIBS |sed 's@/apps/intel/ict/mpi/3.1.038/lib/64@/apps/intel/ict/mpi/3.1.038/lib64@g'`

if test ! "$LIBS" == "$fixedLIBS"; then
  # more fixes needed:
  # also -lmpichcxx got mangled to -lmpichxx
  LIBS=`echo $fixedLIBS |sed 's@mpichxx@mpichcxx@g'`
  # remove -lPEPCF90, -lpromfei and -lprometheus
  LIBS=`echo $LIBS |sed 's@-lPEPCF90@@g'`
  LIBS=`echo $LIBS |sed 's@-lpromfei@@g'`
  LIBS=`echo $LIBS |sed 's@-lprometheus@@g'`
fi

AC_LANG(Fortran)
# F90 (capital F) to invoke preprocessing
# it's only 20 years ago now!
ac_ext=F90
if test "$enable_petsc_fortran_modules" != "no" ; then
  # now try if the petsc fortran modules work:
  AC_LINK_IFELSE(
          [AC_LANG_PROGRAM([],[[
                          use petsc
                          integer :: ierr
                          print*, "hello petsc"
                          call PetscInitialize(PETSC_NULL_CHARACTER, ierr)
                          ]])],
          [
              AC_MSG_NOTICE([PETSc modules are working.])
              AC_DEFINE(HAVE_PETSC_MODULES,1,[Define if you have petsc fortran modules.] )
          ],
          [
              AC_MSG_NOTICE([PETSc modules don't work, using headers instead.])
              unset HAVE_PETSC_MODULES
          ])
else
  unset HAVE_PETSC_MODULES
fi

# now try a more realistic program, it's a stripped down
# petsc tutorial - using the headers in the same way as we do in the code
AC_LINK_IFELSE(
[AC_LANG_SOURCE([
program test
#include "petscversion.h"
#ifdef HAVE_PETSC_MODULES
  use petsc
#if PETSC_VERSION_MINOR==0
  use petscvec 
  use petscmat 
  use petscksp 
  use petscpc
#endif
#endif
implicit none
#ifdef HAVE_PETSC_MODULES
#include "finclude/petscvecdef.h"
#include "finclude/petscmatdef.h"
#include "finclude/petsckspdef.h"
#include "finclude/petscpcdef.h"
#else
#include "finclude/petsc.h"
#if PETSC_VERSION_MINOR==0
#include "finclude/petscvec.h"
#include "finclude/petscmat.h"
#include "finclude/petscksp.h"
#include "finclude/petscpc.h"
#endif
#endif
      double precision  norm
      PetscInt  i,j,II,JJ,m,n,its
      PetscInt  Istart,Iend,ione
      PetscErrorCode ierr
#if PETSC_VERSION_MINOR==2
      PetscBool flg
#else
      PetscTruth  flg
#endif
      PetscScalar v,one,neg_one
      Vec         x,b,u
      Mat         A 
      KSP         ksp

      call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
      m = 3
      n = 3
      one  = 1.0
      neg_one = -1.0
      ione    = 1
      call PetscOptionsGetInt(PETSC_NULL_CHARACTER,'-m',m,flg,ierr)
      call PetscOptionsGetInt(PETSC_NULL_CHARACTER,'-n',n,flg,ierr)

      call MatCreate(PETSC_COMM_WORLD,A,ierr)
      call MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n,ierr)
      call MatSetFromOptions(A,ierr)

      call MatGetOwnershipRange(A,Istart,Iend,ierr)
      
      do 10, II=Istart,Iend-1
        v = -1.0
        i = II/n
        j = II - i*n  
        if (i.gt.0) then
          JJ = II - n
          call MatSetValues(A,ione,II,ione,JJ,v,INSERT_VALUES,ierr)
        endif
        if (i.lt.m-1) then
          JJ = II + n
          call MatSetValues(A,ione,II,ione,JJ,v,INSERT_VALUES,ierr)
        endif
        if (j.gt.0) then
          JJ = II - 1
          call MatSetValues(A,ione,II,ione,JJ,v,INSERT_VALUES,ierr)
        endif
        if (j.lt.n-1) then
          JJ = II + 1
          call MatSetValues(A,ione,II,ione,JJ,v,INSERT_VALUES,ierr)
        endif
        v = 4.0
        call  MatSetValues(A,ione,II,ione,II,v,INSERT_VALUES,ierr)
 10   continue

      call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr)
      call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr)

      call VecCreateMPI(PETSC_COMM_WORLD,PETSC_DECIDE,m*n,u,ierr)
      call VecSetFromOptions(u,ierr)
      call VecDuplicate(u,b,ierr)
      call VecDuplicate(b,x,ierr)

      call VecSet(u,one,ierr)
      call MatMult(A,u,b,ierr)

      call KSPCreate(PETSC_COMM_WORLD,ksp,ierr)
      call KSPSetOperators(ksp,A,A,DIFFERENT_NONZERO_PATTERN,ierr)
      call KSPSetFromOptions(ksp,ierr)

      call KSPSolve(ksp,b,x,ierr)

      call VecAXPY(x,neg_one,u,ierr)
      call VecNorm(x,NORM_2,norm,ierr)
      call KSPGetIterationNumber(ksp,its,ierr)

      call KSPDestroy(ksp,ierr)
      call VecDestroy(u,ierr)
      call VecDestroy(x,ierr)
      call VecDestroy(b,ierr)
      call MatDestroy(A,ierr)

      call PetscFinalize(ierr)
end program test
])],
[
AC_MSG_NOTICE([PETSc program succesfully compiled and linked.])
],
[
cp conftest.F90 test.F90
AC_MSG_FAILURE([Failed to compile and link PETSc program.])])

AC_LANG_RESTORE

# finally check we have the right petsc version
AC_COMPUTE_INT(PETSC_VERSION_MAJOR, "PETSC_VERSION_MAJOR", [#include "petscversion.h"], 
  [AC_MSG_ERROR([Unknown petsc version])])
if test "x$PETSC_VERSION_MAJOR" == "x3" ; then
  AC_MSG_NOTICE([Detected PETSc version 3])
else
  AC_MSG_NOTICE([Detected PETSc version "$PETSC_VERSION_MAJOR"])
  AC_MSG_ERROR([Fluidity needs PETSc version 3])
fi

AC_DEFINE(HAVE_PETSC,1,[Define if you have the PETSc library.])

])dnl ACX_PETSc

AC_DEFUN([ACX_ParMetis], [
# Set variables...
AC_ARG_WITH(
	[ParMetis],
	[  --with-ParMetis=PFX        Prefix where ParMetis is installed],
	[ParMetis="$withval"],
    [])
ParMetis_LIBS_PATH="$ParMetis/lib"

# Check that the compiler uses the library we specified...
if test -e $ParMetis_LIBS_PATH/libparmetis.a; then
	echo "note: using $ParMetis_LIBS_PATH/libparmetis.a"
fi 

# Ensure the comiler finds the library...
tmpLIBS=$LIBS
tmpCPPFLAGS=$CPPFLAGS
AC_LANG_SAVE
AC_LANG_C
LIBS="$tmpLIBS -L$ParMetis_LIBS_PATH -lparmetis -lmetis -lm $ZOLTAN_DEPS"
AC_CHECK_LIB(
	[parmetis],
	[ParMETIS_V3_AdaptiveRepart],
	[AC_DEFINE(HAVE_PARMETIS,1,[Define if you have ParMetis library.])],
	[AC_MSG_ERROR( [Could not link in the ParMetis library... exiting] )] )
tmpLIBS="$tmpLIBS -L$ParMetis_LIBS_PATH -lparmetis -lmetis"
# Save variables...
AC_LANG_RESTORE
LIBS=$tmpLIBS
CPPFLAGS=$tmpCPPFLAGS
])dnl ACX_ParMetis

dnl ----------------------------------------------------------------------------
dnl check for the optional hypre library (linked in with PETSc)
dnl ----------------------------------------------------------------------------
AC_DEFUN([ACX_hypre], [
AC_REQUIRE([ACX_PETSc])

# Ensure the comiler finds the library...
tmpLIBS=$LIBS
tmpCPPFLAGS=$CPPFLAGS
AC_LANG_SAVE
AC_LANG([Fortran])
AC_SEARCH_LIBS(
	[PCHYPRESetType],
	[HYPRE],
	[AC_DEFINE(HAVE_HYPRE,1,[Define if you have hypre library.])],)
# Save variables...
AC_LANG_RESTORE
LIBS=$tmpLIBS
CPPFLAGS=$tmpCPPFLAGS
])dnl ACX_hypre

# ===========================================================================
#         http://www.nongnu.org/autoconf-archive/ac_python_devel.html
# ===========================================================================
#
# SYNOPSIS
#
#   AC_PYTHON_DEVEL([version])
#
# DESCRIPTION
#
#   Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
#   in your configure.ac.
#
#   This macro checks for Python and tries to get the include path to
#   'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LDFLAGS)
#   output variables. It also exports $(PYTHON_EXTRA_LIBS) and
#   $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
#
#   You can search for some particular version of Python by passing a
#   parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
#   note that you *have* to pass also an operator along with the version to
#   match, and pay special attention to the single quotes surrounding the
#   version number. Don't use "PYTHON_VERSION" for this: that environment
#   variable is declared as precious and thus reserved for the end-user.
#
#   This macro should work for all versions of Python >= 2.1.0. As an end
#   user, you can disable the check for the python version by setting the
#   PYTHON_NOVERSIONCHECK environment variable to something else than the
#   empty string.
#
#   If you need to use this macro for an older Python version, please
#   contact the authors. We're always open for feedback.
#
# LICENSE
#
#   Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
#   Copyright (c) 2009 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
#   Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
#   Copyright (c) 2009 Andrew Collier <colliera@ukzn.ac.za>
#   Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
#   Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
#
#   This program is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <http://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

AC_DEFUN([AC_PYTHON_DEVEL],[
	#
	# Allow the use of a (user set) custom python version
	#
	AC_ARG_VAR([PYTHON_VERSION],[The installed Python
		version to use, for example '2.3'. This string
		will be appended to the Python interpreter
		canonical name.])

	AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
	if test -z "$PYTHON"; then
	   AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
	   PYTHON_VERSION=""
	fi

	#
	# Check for a version of Python >= 2.1.0
	#
	AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
	ac_supports_python_ver=`$PYTHON -c "import sys; \
		ver = sys.version.split ()[[0]]; \
		print (ver >= '2.1.0')"`
	if test "$ac_supports_python_ver" != "True"; then
		if test -z "$PYTHON_NOVERSIONCHECK"; then
			AC_MSG_RESULT([no])
			AC_MSG_FAILURE([
This version of the AC@&t@_PYTHON_DEVEL macro
doesn't work properly with versions of Python before
2.1.0. You may need to re-run configure, setting the
variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
to something else than an empty string.
])
		else
			AC_MSG_RESULT([skip at user request])
		fi
	else
		AC_MSG_RESULT([yes])
	fi

	#
	# if the macro parameter ``version'' is set, honour it
	#
	if test -n "$1"; then
		AC_MSG_CHECKING([for a version of Python $1])
		ac_supports_python_ver=`$PYTHON -c "import sys; \
			ver = sys.version.split ()[[0]]; \
			print (ver $1)"`
		if test "$ac_supports_python_ver" = "True"; then
	   	   AC_MSG_RESULT([yes])
		else
			AC_MSG_RESULT([no])
			AC_MSG_ERROR([this package requires Python $1.
If you have it installed, but it isn't the default Python
interpreter in your system path, please pass the PYTHON_VERSION
variable to configure. See ``configure --help'' for reference.
])
			PYTHON_VERSION=""
		fi
	fi

	#
	# Check if you have distutils, else fail
	#
	AC_MSG_CHECKING([for the distutils Python package])
	ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
	if test -z "$ac_distutils_result"; then
		AC_MSG_RESULT([yes])
	else
		AC_MSG_RESULT([no])
		AC_MSG_ERROR([cannot import Python module "distutils".
Please check your Python installation. The error was:
$ac_distutils_result])
		PYTHON_VERSION=""
	fi

	#
	# Check for Python include path
	#
	AC_MSG_CHECKING([for Python include path])
	if test -z "$PYTHON_CPPFLAGS"; then
		python_path=`$PYTHON -c "import distutils.sysconfig; \
           		print (distutils.sysconfig.get_python_inc ());"`
		if test -n "${python_path}"; then
		   	python_path="-I$python_path"
		fi
		PYTHON_CPPFLAGS=$python_path
	fi
	AC_MSG_RESULT([$PYTHON_CPPFLAGS])
	AC_SUBST([PYTHON_CPPFLAGS])

	#
	# Check for Python library path
	#
	AC_MSG_CHECKING([for Python library path])
	if test -z "$PYTHON_LDFLAGS"; then
		# (makes two attempts to ensure we've got a version number
		# from the interpreter)
		ac_python_version=`cat<<EOD | $PYTHON -

# join all versioning strings, on some systems
# major/minor numbers could be in different list elements
from distutils.sysconfig import *
ret = ''
for e in get_config_vars ('VERSION'):
	if (e != None):
		ret += e
print (ret)
EOD`

		if test -z "$ac_python_version"; then
			if test -n "$PYTHON_VERSION"; then
				ac_python_version=$PYTHON_VERSION
			else
				ac_python_version=`$PYTHON -c "import sys; \
					print (sys.version[[:3]])"`
			fi
		fi

		# Make the versioning information available to the compiler
		AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
                                   [If available, contains the Python version number currently in use.])

		# First, the library directory:
		ac_python_libdir=`cat<<EOD | $PYTHON -

# There should be only one
import distutils.sysconfig
for e in distutils.sysconfig.get_config_vars ('LIBDIR'):
	if e != None:
		print (e)
		break
EOD`

		# Before checking for libpythonX.Y, we need to know
		# the extension the OS we're on uses for libraries
		# (we take the first one, if there's more than one fix me!):
		ac_python_soext=`$PYTHON -c \
		  "import distutils.sysconfig; \
		  print (distutils.sysconfig.get_config_vars('SO')[[0]])"`

		# Now, for the library:
		ac_python_soname=`$PYTHON -c \
		  "import distutils.sysconfig; \
		  print (distutils.sysconfig.get_config_vars('LDLIBRARY')[[0]])"`

		# Strip away extension from the end to canonicalize its name:
		ac_python_library=`echo "$ac_python_soname" | sed "s/${ac_python_soext}$//"`

		# This small piece shamelessly adapted from PostgreSQL python macro;
		# credits goes to momjian, I think. I'd like to put the right name
		# in the credits, if someone can point me in the right direction... ?
		#
		if test -n "$ac_python_libdir" -a -n "$ac_python_library" \
			-a x"$ac_python_library" != x"$ac_python_soname"
		then
			# use the official shared library
			ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
			PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
		else
			# old way: use libpython from python_configdir
			ac_python_libdir=`$PYTHON -c \
			  "from distutils.sysconfig import get_python_lib as f; \
			  import os; \
			  print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
			PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
		fi

		if test -z "PYTHON_LDFLAGS"; then
			AC_MSG_ERROR([
  Cannot determine location of your Python DSO. Please check it was installed with
  dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.
			])
		fi
	fi
	AC_MSG_RESULT([$PYTHON_LDFLAGS])
	AC_SUBST([PYTHON_LDFLAGS])

	#
	# Check for site packages
	#
	AC_MSG_CHECKING([for Python site-packages path])
	if test -z "$PYTHON_SITE_PKG"; then
		PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
		        print (distutils.sysconfig.get_python_lib(0,0));"`
	fi
	AC_MSG_RESULT([$PYTHON_SITE_PKG])
	AC_SUBST([PYTHON_SITE_PKG])

	#
	# libraries which must be linked in when embedding
	#
	AC_MSG_CHECKING(python extra libraries)
	if test -z "$PYTHON_EXTRA_LIBS"; then
	   PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
                conf = distutils.sysconfig.get_config_var; \
                print (conf('LOCALMODLIBS') + ' ' + conf('LIBS'))"`
	fi
	AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
	AC_SUBST(PYTHON_EXTRA_LIBS)

	#
	# linking flags needed when embedding
	#
	AC_MSG_CHECKING(python extra linking flags)
	if test -z "$PYTHON_EXTRA_LDFLAGS"; then
		PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
			conf = distutils.sysconfig.get_config_var; \
			print (conf('LINKFORSHARED'))"`
	fi
	AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
	AC_SUBST(PYTHON_EXTRA_LDFLAGS)

	#
	# final check to see if everything compiles alright
	#
	AC_MSG_CHECKING([consistency of all components of python development environment])
	# save current global flags
	LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
	CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
	AC_LANG_PUSH([C])
	AC_LINK_IFELSE([
		AC_LANG_PROGRAM([[#include <Python.h>]],
				[[Py_Initialize();]])
		],[pythonexists=yes],[pythonexists=no])
	AC_LANG_POP([C])
	# turn back to default flags
	CPPFLAGS="$ac_save_CPPFLAGS"
	LIBS="$ac_save_LIBS"

	AC_MSG_RESULT([$pythonexists])

        if test ! "x$pythonexists" = "xyes"; then
	   AC_MSG_FAILURE([
  Could not link test program to Python. Maybe the main Python library has been
  installed in some non-standard library path. If so, pass it to configure,
  via the LDFLAGS environment variable.
  Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
  ============================================================================
   ERROR!
   You probably have to install the development version of the Python package
   for your distribution.  The exact name of this package varies among them.
  ============================================================================
	   ])
	  PYTHON_VERSION=""
	fi

	#
	# all done!
	#
])

AC_DEFUN([ACX_zoltan], [
# Set variables...
AC_ARG_WITH(
	[zoltan],
	[  --with-zoltan=prefix        Prefix where zoltan is installed],
	[zoltan="$withval"],
    [])

tmpLIBS=$LIBS
tmpCPPFLAGS=$CPPFLAGS
if test $zoltan != no; then
  if test $zoltan != yes; then
    zoltan_LIBS_PATH="$zoltan/lib"
    zoltan_INCLUDES_PATH="$zoltan/include"
    # Ensure the comiler finds the library...
    tmpLIBS="$tmpLIBS -L$zoltan_LIBS_PATH"
    tmpCPPFLAGS="$tmpCPPFLAGS  -I/$zoltan_INCLUDES_PATH"
  fi
  tmpLIBS="$tmpLIBS -L/usr/lib -L/usr/local/lib/ -lzoltan -lparmetis -lmetis $ZOLTAN_DEPS"
  tmpCPPFLAGS="$tmpCPPFLAGS -I/usr/include/ -I/usr/local/include/"
fi
LIBS=$tmpLIBS
CPPFLAGS=$tmpCPPFLAGS
# Check that the compiler uses the library we specified...
if test -e $zoltan_LIBS_PATH/libzoltan.a; then
  echo "note: using $zoltan_LIBS_PATH/libzoltan.a"
fi 

# Check that the compiler uses the include path we specified...
if test -e $zoltan_INCLUDES_PATH/zoltan.mod; then
	echo "note: using $zoltan_INCLUDES_PATH/zoltan.mod"
fi 


AC_LANG_SAVE
AC_LANG_C
AC_CHECK_LIB(
	[zoltan],
	[Zoltan_Initialize],
	[AC_DEFINE(HAVE_ZOLTAN,1,[Define if you have zoltan library.])],
	[AC_MSG_ERROR( [Could not link in the zoltan library... exiting] )] )
# Save variables...
AC_LANG_RESTORE

ZOLTAN="yes"
AC_SUBST(ZOLTAN)

echo $LIBS
])dnl ACX_zoltan

AC_DEFUN([ACX_adjoint], [
# Set variables...
AC_ARG_WITH(
	[adjoint],
	[  --with-adjoint=prefix        Prefix where libadjoint is installed],
	[adjoint="$withval"],
    [])

bakLIBS=$LIBS
tmpLIBS=$LIBS
tmpCPPFLAGS=$CPPFLAGS
if test "$adjoint" != "no"; then
  if test "$adjoint" != "yes"; then
    adjoint_LIBS_PATH="$adjoint/lib"
    adjoint_INCLUDES_PATH="$adjoint/include"
    # Ensure the comiler finds the library...
    tmpLIBS="$tmpLIBS -L$adjoint/lib"
    tmpCPPFLAGS="$tmpCPPFLAGS  -I$adjoint/include -I$adjoint/include/libadjoint"
  fi
  tmpLIBS="$tmpLIBS -L/usr/lib -L/usr/local/lib/ -ladjoint"
  tmpCPPFLAGS="$tmpCPPFLAGS -I/usr/include/ -I/usr/local/include/ -I/usr/include/libadjoint -I/usr/local/include/libadjoint"
fi
LIBS=$tmpLIBS
CPPFLAGS=$tmpCPPFLAGS

AC_LANG_SAVE
AC_LANG_C
AC_CHECK_LIB(
	[adjoint],
	[adj_register_equation],
	[AC_DEFINE(HAVE_ADJOINT,1,[Define if you have libadjoint.])HAVE_ADJOINT=yes],
	[AC_MSG_WARN( [Could not link in libadjoint ... ] );HAVE_ADJOINT=no;LIBS=$bakLIBS] )
# Save variables...
AC_LANG_RESTORE

])dnl ACX_adjoint