2004-10-24 01:08:12 +04:00
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dnl -*- shell-script -*-
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dnl
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2004-11-22 04:38:40 +03:00
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dnl Copyright (c) 2004-2005 The Trustees of Indiana University.
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dnl All rights reserved.
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dnl Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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dnl All rights reserved.
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2004-11-28 23:09:25 +03:00
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dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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dnl University of Stuttgart. All rights reserved.
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2004-11-22 04:38:40 +03:00
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dnl $COPYRIGHT$
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dnl
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dnl Additional copyrights may follow
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dnl
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2004-10-24 01:08:12 +04:00
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dnl $HEADER$
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dnl
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AC_DEFUN([OMPI_F77_GET_FORTRAN_HANDLE_MAX],[
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# Find the maximum value of fortran integers, then calculate
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# min(INT_MAX, max fortran INTEGER). This represents the maximum
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# number of fortran MPI handle index.
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AC_MSG_CHECKING([for max fortran MPI handle index])
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# Find max fortran INTEGER value. Set to sentinel value if we don't
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# have a Fortran compiler (e.g., if --disable-f77 was given)
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if test "$OMPI_WANT_F77_BINDINGS" = "0" ; then
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ompi_fint_max=-1
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else
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ompi_sizeof_fint=`expr $OMPI_SIZEOF_FORTRAN_INT \* 8 - 1`
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ompi_fint_max=1
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while test "$ompi_sizeof_fint" != "0"; do
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ompi_fint_max=`expr $ompi_fint_max \* 2`
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ompi_sizeof_fint=`expr $ompi_sizeof_fint - 1`
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done
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ompi_fint_max=`expr $ompi_fint_max - 1`
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fi
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# Compare to C MAX_INT.
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rm -f conftest.out > /dev/null 2>&1
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AC_RUN_IFELSE(AC_LANG_PROGRAM([[
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#include <stdio.h>
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#include <limits.h>
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]],[[FILE *fp = fopen("conftest.out", "w");
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long fint = $ompi_fint_max;
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long cint = INT_MAX;
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if (-1 == fint) fint = cint;
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fprintf(fp, "%ld", (cint < fint) ? cint : fint);
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fclose(fp);]]), HAPPY=1, HAPPY=0)
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if test "$HAPPY" = "1"; then
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OMPI_FORTRAN_HANDLE_MAX=`cat conftest.out`
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else
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# Something went wrong, so be conservative
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OMPI_FORTRAN_HANDLE_MAX=32767
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fi
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rm -f conftest.out > /dev/null 2>&1
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AC_DEFINE_UNQUOTED(OMPI_FORTRAN_HANDLE_MAX,
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$OMPI_FORTRAN_HANDLE_MAX,
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[Max handle value for fortran MPI handles, effectively min(INT_MAX, max fortran INTEGER value)])
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AC_MSG_RESULT([$OMPI_FORTRAN_HANDLE_MAX])
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])dnl
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