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dnl -*- shell-script -*-
#
# $Id: lam_get_fortran_alignment.m4,v 1.1.2.1 2001/11/09 20:53:13 brbarret Exp $
#
# This file is part of the University of Notre Dame implementation of
# LAM/MPI. See the LICENSE file in the top-level directory for
# license and copyright details.
define(LAM_GET_FORTRAN_ALIGNMENT,[
# Determine FORTRAN datatype size.
# First arg is type, 2nd (optional) arg is config var to define.
AC_MSG_CHECKING(alignment of FORTRAN $1)
lam_ac_align_fn=
if test "x$lam_ac_doubleunder" = xy || test "x$lam_ac_singleunder" = xy; then
lam_ac_align_fn=align_
else
if test "x$lam_ac_nounder" = xy; then
lam_ac_align_fn=align
else
if test "x$lam_ac_caps" = xy; then
lam_ac_align_fn=ALIGN
else
AC_MSG_ERROR(FORTRAN external naming convention undefined)
fi
fi
fi
if test -n "$lam_ac_align_fn"; then
cat > conftestf.f <<EOF
program falign
external ALIGN
$1 w,x,y,z
CHARACTER a,b,c
common /foo/a,w,b,x,y,c,z
call ALIGN(w,x,y,z)
end
EOF
cat > conftest.c <<EOF
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
void exit(int);
#endif
void $lam_ac_align_fn(char *w, char *x, char *y, char *z)
{ unsigned long aw, ax, ay, az;
FILE *f=fopen("conftestval", "w");
if (!f) exit(1);
aw = (unsigned long) w;
ax = (unsigned long) x;
ay = (unsigned long) y;
az = (unsigned long) z;
if (! ((aw%16)||(ax%16)||(ay%16)||(az%16))) fprintf(f, "%d\n", 16);
else if (! ((aw%12)||(ax%12)||(ay%12)||(az%12))) fprintf(f, "%d\n", 12);
else if (! ((aw%8)||(ax%8)||(ay%8)||(az%8))) fprintf(f, "%d\n", 8);
else if (! ((aw%4)||(ax%4)||(ay%4)||(az%4))) fprintf(f, "%d\n", 4);
else if (! ((aw%2)||(ax%2)||(ay%2)||(az%2))) fprintf(f, "%d\n", 2);
else fprintf(f, "%d\n", 1);
fclose(f);
}
#ifdef __cplusplus
}
#endif
EOF
$CC $CFLAGS -c conftest.c 1>&5 2>&1
if test ! -s conftest.o; then
AC_MSG_WARN(error compiling/running conftest)
else
$F77 $FFLAGS conftestf.f conftest.o -o conftest 1>&5 2>&1
if test -s conftest && (./conftest; exit) 2>/dev/null; then
lam_ac_alignment=`cat conftestval`
AC_MSG_RESULT $lam_ac_alignment
if test -n "$2"; then
AC_DEFINE_UNQUOTED($2,$lam_ac_alignment)
fi
else
AC_MSG_WARN(error compiling/running conftest)
fi
fi
fi
/bin/rm -f conftest*])dnl
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