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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) 2013 Cisco Systems, Inc. All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
# OMPI_F77_GET_FORTRAN_HANDLE_MAX()
# ---------------------------------------------------------------
# Find the maximum value of fortran integers, then calculate
# min(INT_MAX, max fortran INTEGER). This represents the maximum
# number of fortran MPI handle index.
AC_DEFUN([OMPI_F77_GET_FORTRAN_HANDLE_MAX],[
AC_CACHE_CHECK([for max Fortran MPI handle index],
[ompi_cv_f77_fortran_handle_max],
[ # Find max fortran INTEGER value. Set to sentinel value if we don't
# have a Fortran compiler (e.g., if --disable-f77 was given).
if test "$OMPI_WANT_F77_BINDINGS" = "0" ; then
ompi_fint_max=0
else
OPAL_COMPUTE_MAX_VALUE([$OMPI_SIZEOF_FORTRAN_INTEGER], [ompi_fint_max])
fi
# Get INT_MAX. Compute a SWAG if we are cross compiling or something
# goes wrong.
rm -f conftest.out >/dev/null 2>&1
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
#include <limits.h>
]],[[FILE *fp = fopen("conftest.out", "w");
long cint = INT_MAX;
fprintf(fp, "%ld", cint);
fclose(fp);]])],
[ompi_cint_max=`cat conftest.out`],
[ompi_cint_max=0],
[ #cross compiling is fun. compute INT_MAX same as INTEGER max
OPAL_COMPUTE_MAX_VALUE([$ac_cv_sizeof_int], [ompi_cint_max])])
if test "$ompi_cint_max" = "0" ; then
# wow - something went really wrong. Be conservative
ompi_cv_f77_fortran_handle_max=32767
elif test "$ompi_fint_max" = "0" ; then
# we aren't compiling Fortran - just set it to C INT_MAX
ompi_cv_f77_fortran_handle_max=$ompi_cint_max
else
# take the lesser of C INT_MAX and Fortran INTEGER
# max. The resulting value will then be storable in
# either type. There's no easy way to do this in
# the shell, so make the preprocessor do it.
ompi_cv_f77_fortran_handle_max="( $ompi_fint_max < $ompi_cint_max ? $ompi_fint_max : $ompi_cint_max )"
fi
rm -f conftest.out > /dev/null 2>&1 ])
AC_DEFINE_UNQUOTED([OMPI_FORTRAN_HANDLE_MAX],
[$ompi_cv_f77_fortran_handle_max],
[Max handle value for fortran MPI handles, effectively min(INT_MAX, max fortran INTEGER value)])
])dnl
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