#!/bin/sh
# configure script for the GNUmakefile
# this file is part of FormCalc
# last modified 19 Aug 04 th
# note: has nothing to do with GNU autoconf


if (echo "test\c"; echo 1,2,3) | grep c > /dev/null ; then
  if (echo -n test; echo 1,2,3) | grep n > /dev/null ; then
    echo_n=
    echo_c='
'
  else
    echo_n=-n
    echo_c=
  fi
else
  echo_n=
  echo_c='\c'
fi


findprog()
{
  echo $echo_n "looking for $1... $echo_c" 1>&2
  shift
  for prog in $* ; do
    full=`which $prog`
    if [ -x "$full" ] ; then
      echo $full 1>&2
      basename $full
      return 0
    fi
  done
  echo "no $* in your path" 1>&2
  return 1
}


findpath()
{
  echo $echo_n "looking for path to $1... $echo_c" 1>&2
  file=$2
  shift 2
  for path in $* ; do
    if [ -f "$path/$file" ] ; then
      (cd $path ; pwd 1>&2 ; pwd)
      return 0
    fi
  done
  echo "no $file in $*" 1>&2
  return 1
}


# check the arguments

ARG_MAKEARGS=""

for arg in "$@" ; do
  case $arg in
  -*) echo "Unknown option $arg" 1>&2 ;;
  *) ARG_MAKEARGS="$ARG_MAKEARGS $arg" ;;
  esac
done


# look for some programs

CONF_MAKE=`findprog make gmake Make make` || exit 1

CONF_CC=`findprog gcc $CC gcc` || exit 1

CONF_CFLAGS="${CFLAGS--O3 -fomit-frame-pointer -ffast-math}"

if [ -z "$FC" ] ; then
  case $HOSTTYPE in
  alpha)
	FC=f77
	FFLAGS="${FFLAGS--O -extend_source -warn truncated_source}" ;;
  *sun* | *sparc*)
	FC=f77
	FFLAGS="${FFLAGS--fast -e}" ;;
  hp*)
	FC=fort77
	FFLAGS="${FFLAGS--O2 +es +U77}" ;;
  *86 | *linux)
#	FC=pgf77
#	FFLAGS="${FFLAGS--fast -Mextend -g77libs}" ;;
        FC=f77
        FFLAGS="${FFLAGS--O0 -ffixed-line-length-none}" 
  esac
fi


CONF_FC=`findprog f77 $FC f77 fort77 xlf f90 pgf77 g77` || exit 1
CONF_FFLAGS="$FFLAGS"


$CONF_FC -v -c 2>&1 | grep "gcc version" > /dev/null && \
  CONF_FFLAGS="-O0 -ffixed-line-length-none"


# does Fortran append underscores to symbols?

echo $echo_n "does $CONF_FC append underscores... $echo_c" 1>&2

test=test$$
trap "rm -f $test*" 0 1 2 15

cat > $test.f << _EOF_
	subroutine uscore
	end
_EOF_

$CONF_FC -c $test.f > /dev/null 2>&1

if nm $test.o | grep uscore_ > /dev/null 2>&1 ; then
  echo "yes" 1>&2
  CONF_CFLAGS="$CONF_CFLAGS -DHAVE_UNDERSCORE"
else
  echo "no" 1>&2
fi


# check for the necessary libraries


echo "creating makefile" 1>&2

cat - makefile.in > makefile << _EOF_
# --- variables defined by configure ---



FC = $CONF_FC
FFLAGS = $CONF_FFLAGS

CC = $CONF_CC
CFLAGS = $CONF_CFLAGS

# --- end defs by configure ---


_EOF_

  echo "" 1>&2
  echo "now you must run $CONF_MAKE" 1>&2
  echo "" 1>&2

exit 0

