dnl -*- shell-script -*-
dnl
dnl Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
dnl                         University Research and Technology
dnl                         Corporation.  All rights reserved.
dnl Copyright (c) 2004-2005 The University of Tennessee and The University
dnl                         of Tennessee Research Foundation.  All rights
dnl                         reserved.
dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
dnl                         University of Stuttgart.  All rights reserved.
dnl Copyright (c) 2004-2005 The Regents of the University of California.
dnl                         All rights reserved.
dnl Copyright (c) 2006      Los Alamos National Security, LLC.  All rights
dnl                         reserved. 
dnl Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
dnl $COPYRIGHT$
dnl 
dnl Additional copyrights may follow
dnl 
dnl $HEADER$
dnl
dnl sets:
dnl  F77                   : full pathname to compiler
dnl  BASEF77               : compiler name (no path)
dnl  OMPI_WANT_F77_BINDINGS : (actually set by ompi_configure_options, may be
dnl                          redefined here)
dnl  FC                    : Same as F77.  Side effect of AC_PROG_FC.  Should
dnl                          not be used
dnl defines:
dnl  OMPI_F77               : same as F77
dnl  OMPI_WANT_F77_BINDINGS :
dnl am_conditional:
dnl  OMPI_WANT_F77_BINDINGS :

AC_DEFUN([OMPI_SETUP_F77],[

# Modularize this setup so that sub-configure.in scripts can use this
# same setup code.

ompi_show_subtitle "Fortran 77 compiler" 

#
# Check for the compiler
#
# Note that we don't actually *use* the fortran compiler to build
# anything in OMPI; it's only used here in configure to find out
# symbol conventions, type sizes, etc.  We also pass it down to
# the wrapper compiler mpif77.
#
# Always run this test, even if fortran isn't wanted so that F77 has
# value for the Fint tests
#
ompi_fflags_save="$FFLAGS"
AC_PROG_F77([gfortran g77 f77 xlf frt ifort pgf77 fort77 fl32 af77])
FFLAGS="$ompi_fflags_save"
if test -z "$F77"; then
    AC_MSG_WARN([*** Fortran 77 bindings disabled (could not find compiler)])
    OMPI_WANT_F77_BINDINGS=0
    OMPI_F77="none"
    BASEF77="none"
    OMPI_F77_ABSOLUTE="none"
else
    OMPI_F77="$F77"
    set dummy $OMPI_F77
    OMPI_F77_ARGV0=[$]2
    BASEF77="`basename $OMPI_F77_ARGV0`"
    OMPI_WHICH([$OMPI_F77_ARGV0], [OMPI_F77_ABSOLUTE])
    
    if test "$OMPI_WANT_F77_BINDINGS" = "0" ; then
        AC_MSG_WARN([*** Fortran 77 bindings disabled by user])
        OMPI_WANT_F77_BINDINGS=0
    else
        OMPI_WANT_F77_BINDINGS=1
    fi
fi

# make sure the compiler actually works, if not cross-compiling
# Don't just use the AC macro so that we can have a pretty
# message.
AS_IF([test $OMPI_WANT_F77_BINDINGS -eq 1],
       [OMPI_CHECK_COMPILER_WORKS([Fortran 77], [], [], [], 
           [AC_MSG_ERROR([Could not run a simple Fortran 77 program.  Aborting.])])])

# now make sure we know our linking convention...
OMPI_F77_FIND_EXT_SYMBOL_CONVENTION

# Make sure we can link with C code...
AS_IF([test $OMPI_WANT_F77_BINDINGS -eq 1],
  [OMPI_LANG_LINK_WITH_C([Fortran 77], [],
    [cat <<EOF
**********************************************************************
It appears that your Fortran 77 compiler is unable to link against
object files created by your C compiler.  This typically indicates
one of a few possibilities:

  - A conflict between CFLAGS and FFLAGS
  - A problem with your compiler installation(s)
  - Different default build options between compilers (e.g., C
    building for 32 bit and Fortran building for 64 bit)
  - Incompatible compilers

Such problems can usually be solved by picking compatible compilers
and/or CFLAGS and FFLAGS.  More information (including exactly what
command was given to the compilers and what error resulted when the
commands were executed) is available in the config.log file in this
directory.
**********************************************************************
EOF
     AC_MSG_ERROR([C and Fortran 77 compilers are not link compatible.  Can not continue.])])])

AC_DEFINE_UNQUOTED(OMPI_WANT_F77_BINDINGS, $OMPI_WANT_F77_BINDINGS,
    [Whether we want the MPI f77 bindings or not])
AC_DEFINE_UNQUOTED(OMPI_F77, "$OMPI_F77", [OMPI underlying F77 compiler])
AM_CONDITIONAL(OMPI_WANT_F77_BINDINGS, test "$OMPI_WANT_F77_BINDINGS" = "1")
AC_SUBST(OMPI_F77_ABSOLUTE)
])