#!/bin/sh
#*=====================================================================*/
#*    serrano/prgm/project/bigloo/bigloo/autoconf/doubleprec           */
#*    -------------------------------------------------------------    */
#*    Author      :  Manuel Serrano                                    */
#*    Creation    :  Wed Aug  9 13:27:23 1995                          */
#*    Last change :  Mon Jul 10 14:02:42 2023 (serrano)                */
#*    -------------------------------------------------------------    */
#*    Give the double precision on the current architecture            */
#*=====================================================================*/

#*---------------------------------------------------------------------*/
#*    flags                                                            */
#*---------------------------------------------------------------------*/
cflags=

#*---------------------------------------------------------------------*/
#*    We parse the arguments                                           */
#*---------------------------------------------------------------------*/
while : ; do
  case $1 in
    "")
      break;;

    --cflags=*|-cflags=*)
      cflags="`echo $1 | sed 's/^[-a-z]*=//'`";;

    -*)
      echo "Unknown option \"$1\", ignored" >&2;;
  esac
  shift
done

file=$TMP/actest$USER
aout=$TMP/Xactest$USER

#*---------------------------------------------------------------------*/
#*    compile                                                          */
#*---------------------------------------------------------------------*/
compile="$CC $CFLAGS $cflags $file.c -o $aout >/dev/null"

#*---------------------------------------------------------------------*/
#*    The test C file                                                  */
#*---------------------------------------------------------------------*/
if test -f $file.c; then
   rm -f $file.c || exit $?
fi

#*---------------------------------------------------------------------*/
#*    Test                                                             */
#*---------------------------------------------------------------------*/
cat > $file.c <<EOF
#include <stdio.h>

static void add1( double f, double *fsum ) {
  *fsum = f + 1.0;
}

int main( int argc, char *argv[] ) {
  int dblprec = 0;
  double f = 0.1;
  double fsum = 1.0+f;
  while (fsum != 1.0) {
    f /= 10.0;
    if (++dblprec > 20) break;
    add1(f, &fsum);
  }
  dblprec = dblprec-1;

  printf( "%d\n", dblprec );
}
EOF

#*---------------------------------------------------------------------*/
#*    Compilation test                                                 */
#*---------------------------------------------------------------------*/
if eval "$BUILDSH $compile"; then
   \rm -f $file.*
   eval "$HOSTSH $aout"
else
   \rm -f $file.*
   exit $?
fi

rm -f $aout
rm -rf $aout*
