#! /bin/sh
# configure script
# this file is part of FormCalc
# last modified 18 May 06 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
      echo $prog
      return 0
    fi
  done
  echo "no $* in your path" 1>&2
  return 1
}


findlib()
{
  echo $echo_n "looking for $1... $echo_c" 1>&2
  file=$2
  shift 2
  for base in "$@" ; do
    for path in \
      "$base/lib" \
      "$base/$CONF_HOSTTYPE/lib" \
      "$base/build" \
      "$base/src"
    do
      if [ -f "$path/$file" ] ; then
        (cd "`dirname \"$path\"`" ; pwd 1>&2 ; pwd)
        return 0
      fi
    done
  done
  echo "not found" 1>&2
  return 1
}


# check the arguments

CONF_HOSTTYPE=`tcsh -cf 'echo $HOSTTYPE'`

ARG_MAKEARGS=""

for arg in "$@" ; do
  case $arg in
  --quad) ARG_QUAD=1 ;;
  -*) echo "Unknown option $arg" 1>&2 ;;
  *=*) eval $arg ;;
  *) ARG_MAKEARGS="$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 -g}"

CONF_FC=`findprog f77 $FC ${ARG_QUAD+ifort} pgf77 ifort fort77 f77 xlf f90 g77 g95 gfortran` || exit 1

if $CONF_FC -v -c 2>&1 | grep "gcc version" > /dev/null ; then
  CONF_FFLAGS="-O0 -ffixed-line-length-none -g"
else
  CONF_FFLAGS="${FFLAGS-default}"
  [ "$CONF_FFLAGS" = default ] && case "$CONF_FC$CONF_HOSTTYPE" in
  *pgf77*)
	CONF_FFLAGS="-fast -Mextend -g77libs -Ktrap=fp -g" ;;
  *ifort*)
	CONF_FFLAGS="-O3 -extend_source -warn truncated_source -fpe0 -g ${ARG_QUAD+-r16 -DDBLE=QEXT -DDIMAG=QIMAG -DDCONJG=QCONJG -DDCMPLX=QCMPLX}" ;;
  *alpha)
	CONF_FFLAGS="-fast -extend_source -warn truncated_source -fpe0 -g3" ;;
  *sun* | *sparc*)
	CONF_FFLAGS="-fast -e -ftrap=common -g" ;;
  *hp*)
	CONF_FFLAGS="-O2 +es +U77 +FPVZO -g" ;;
  *)
	CONF_FFLAGS="-O -g" ;;
  esac
fi


# 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 $CONF_FFLAGS -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

CONF_LT=`findlib LoopTools libooptools.a \
  $LT ../LoopTools ../../LoopTools $HOME/LoopTools \
  /usr/local/LoopTools /usr/LoopTools /usr/local /usr` || exit 1

CONF_LDFLAGS="-L\$(LT)/lib -looptools${ARG_QUAD+-quad}"

CONF_FH=`findlib FeynHiggs libFH.a \
  $FH ../FeynHiggs* ../../FeynHiggs* $HOME/FeynHiggs* \
  /usr/local/FeynHiggs* /usr/FeynHiggs* /usr/local /usr` && \
  CONF_LDFLAGS="$CONF_LDFLAGS -L$CONF_FH -lFH"

CONF_LHAPDF=`findlib LHAPDF libLHAPDF.a \
  $LHAPDF ../lhapdf* ../../lhapdf* $HOME/lhapdf* \
  /usr/local/lhapdf* /usr/lhapdf* /usr/local /usr` && \
  CONF_LDFLAGS="$CONF_LDFLAGS -L$CONF_LHAPDF -lLHAPDF"


echo "creating makefile" 1>&2

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

LT = $CONF_LT

LDFLAGS = $CONF_LDFLAGS

FC = $CONF_FC
FFLAGS = $CONF_FFLAGS

CC = $CONF_CC
CFLAGS = $CONF_CFLAGS

# --- end defs by configure ---


_EOF_

if [ -n "$ARG_MAKEARGS" ] ; then
  $CONF_MAKE $ARG_MAKEARGS
else
  echo "" 1>&2
  echo "now you must run $CONF_MAKE" 1>&2
  echo "" 1>&2
fi

exit 0

