fc.m4

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dnl ######################################################################
dnl
dnl File:       fc.m4
dnl
dnl Purpose:    Determine F90 (a.k.a. FC) compilers.
dnl
dnl Version:    $Id: fc.m4,v 1.2 2005/07/13 00:02:25 kruger Exp $
dnl
dnl Copyright Tech-X Corporation, 2001-2005.  Redistribution allowed
dnl provided this copyright statement remains intact.
dnl
dnl ######################################################################

dnl ----------------------------------------------------------------------
dnl 
dnl  See README.fortran
dnl  Relevant files:
dnl   f77.m4, f77flags.m4, f77interop.m4, mpif77.m4
dnl   fc.m4, fcflags.m4, fcinterop.m4, mpif90.m4
dnl
dnl Set the variable:
dnl     FC
dnl
dnl     Notes:
dnl        o See fcflags.m4 for setting the flags.  The separation is 
dnl          done to make the configure flags more intuitive
dnl
dnl ----------------------------------------------------------------------

dnl ----------------------------------------------------------------------
dnl  allow flags or environment to overwrite variables
dnl ----------------------------------------------------------------------
AC_ARG_WITH(
FC,
[  --with-FC=MyF90   to use MyF90 instead of the default Fortran compiler],
FC="$withval")

AC_MSG_CHECKING(for F90 compilers )


dnl ----------------------------------------------------------------------
dnl Set up default values
dnl ----------------------------------------------------------------------

if test "$FC" != none; then

  dnl Check whether an absolute path
  if test -n "$FC"; then
    absp=`echo "$FC" | grep ^/`
  fi
  if test -n "$absp"; then
    exists=`ls $FC`
    if test -z $exists; then
      AC_MSG_ERROR($FC does not exist.)
    fi

  dnl Not an absolute path, so must find
  else

  dnl Allow additional places to look for FC
    AC_ARG_WITH(FC_PATH,
[  --with-FC_PATH=<F90 compiler directory>     to set root for f90 installation], F90_PATH="$withval")

dnl First look in path, dnl  then system paths, then paths for compilers
dnl that work on more than one platform.  Thus give user the preference,
dnl then the systems (which are ignored on other systems), then the generic
    if test -z "$FC_PATH"; then
      FC_PATH=$PATH:/usr/local/lf9562/bin:/opt/SUNWspro/bin:/usr/local/intel_fc_80/bin:/usr/local/pgi/linux86/bin:/usr/absoft/bin:/Applications/Absoft/bin
    fi

dnl Look for specified compiler or else any of those supported
    if test -n "$FC"; then
      FCS=$FC
    else
      FCS="lf95 pgf90 xlf90 ifort ifc f90"
    fi  
    AC_PATH_PROGS(FC, $FCS, "", $FC_PATH)

  fi  

  if test -n "$FC"; then
    AC_MSG_RESULT(... $FC)
    AC_SUBST(FC)
    FC_BINDIR=`dirname $FC`
    echo Using F90 compiler $FC.
  else
    AC_MSG_WARN(Unable to find f90 in your path.  F90 modules will not compile.)
  fi

else
  FC=""
  AC_MSG_WARN(F90 specified as none.  F90 modules will not compile.)
fi
dnl ----------------------------------------------------------------------
dnl export
dnl ----------------------------------------------------------------------
AC_MSG_RESULT($FC)
AC_SUBST(FC)
dnl ----------------------------------------------------------------------
dnl FC_BASE is in case the FC flag gets overwritten by mpif90
dnl ----------------------------------------------------------------------
FC_BASE=`basename $FC`
AC_SUBST(FC_BASE)