dnl Gecode support

AC_ARG_ENABLE(gecode,
	[ --enable-gecode            install gecode library],
        [use_gecode="$enableval"], use_gecode=no)

dnl gecode is usually in /usr/local
if test -d /usr/local/include/gecode; then
  CFLAGS="$CFLAGS -I/usr/local/include"
  SHLIB_CXXFLAGS="$SHLIB_CXXFLAGS -I/usr/local/include"
  GECODE_EXTRALIBS="-L/usr/local/lib"
fi

if test "$use_gecode" = no; then
  PKG_GECODE=""
else
  PKG_GECODE="packages/gecode"
fi
AC_SUBST(PKG_GECODE)

AC_MSG_CHECKING([if dynamic arrays are supported])

AC_COMPILE_IFELSE([
  AC_LANG_PROGRAM([[void foo(int n) { int a[n]; a[1]=0; }]],[[foo(3);]])
  ],[
  AC_MSG_RESULT([yes])
  AC_DEFINE([HAVE_DYNARRAY],[1],[Define if dynamic arrays are supported])
  ],[
  AC_MSG_RESULT([no])
  ])

GECODE_VERSION=unknown-gecode-version


if test "$use_gecode" = yes; then
   if test $i_am_cross_compiling = yes
   then
     GECODE_VERSION=4.2.1
   elif test x"$WINDOWS" = x; then
     if test $ac_cv_sizeof_int_p = 8; then
       GECODE_ARCH=x64
     else
       GECODE_ARCH=i386
     fi
     GECODE_PATH=`which fzn-gecode`
     GECODE_PATH=`dirname "$GECODE_PATH"`
     GECODE_PATH=`dirname "$GECODE_PATH"`
     GECODE_INCLUDES="$GECODE_PATH"/include
     GECODE_LIBDIR="\"$GECODE_PATH\""/lib
     GECODE_BINDIR="\"$GECODE_PATH\""/bin
     GECODE_TVERSION=`echo "$GECODE_PATH"/lib/GecodeDriver-*-d-"$GECODE_ARCH".lib | cut -d'-' -f 2-4`
     GECODE_VERSION=`echo "$GECODE_TVERSION"|sed 's/-/\./g'`
     GECODE_MAJOR=`echo $GECODE_VERSION| sed 's/\(^.\).*/\1/'`
     GE_SUF="-$GECODE_TVERSION-r-$GECODE_ARCH.dll"
     GECODE_EXTRALIBS="$GECODE_BINDIR/GecodeDriver$GE_SUF \
    		      $GECODE_BINDIR/GecodeSupport$GE_SUF \
		      $GECODE_BINDIR/GecodeKernel$GE_SUF \
     		      $GECODE_BINDIR/GecodeInt$GE_SUF \
     		      $GECODE_BINDIR/GecodeSet$GE_SUF \
     		      $GECODE_BINDIR/GecodeSearch$GE_SUF"
    if test "$GECODE_MAJOR" = "4"; then
      GECODE_EXTRALIBS="$GECODE_EXTRALIBS $GECODE_BINDIR/GecodeFloat$GE_SUF"
    fi
  else
  AC_MSG_CHECKING([gecode version])
  AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include "gecode/support/config.hpp"
#include <stdio.h>
]],[[
  FILE* out = fopen("conftest.out","w");
  fprintf(out,"%s\n",GECODE_VERSION);
  fclose(out);
  return 0;
]])],[GECODE_VERSION=$(cat conftest.out)
    AC_MSG_RESULT([$GECODE_VERSION])],
   [AC_MSG_ERROR([cannot determine gecode version])])
   case "$target_os" in
     *darwin*)
     AC_MSG_CHECKING([if -framework gecode is required])
     AC_LANG_PUSH([C++])
     saved_CXXFLAGS="$CXXFLAGS"
     CXXFLAGS="$CXXFLAGS -framework gecode"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include "gecode/int.hh"
]],[[
Gecode::Exception e("","");
return 0;
]])],[GECODE_EXTRALIBS="-framework gecode"
      AC_MSG_RESULT([yes])],
     [AC_MSG_RESULT([no])])
     AC_LANG_POP()
     CXXFLAGS="$saved_CXXFLAGS"
     ;;
   esac

     GECODE_MAJOR=`echo $GECODE_VERSION| sed 's/\(^.\).*/\1/'`
  if test "$GECODE_MAJOR" = "3"; then
    GECODE_EXTRALIBS="$GECODE_EXTRALIBS -lgecodesupport -lgecodekernel -lgecodeint -lgecodeset -lgecodesearch"
  else
    GECODE_EXTRALIBS="$GECODE_EXTRALIBS -lgecodesupport -lgecodekernel -lgecodefloat -lgecodeint -lgecodeset -lgecodesearch"
  fi

fi
fi

saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I \"$GECODE_INCLUDES\""

AC_CHECK_HEADER(gecode/support/config.hpp)

CPPFLAGS="$saved_CPPFLAGS"

AC_SUBST(GECODE_EXTRALIBS)
AC_SUBST(GECODE_INCLUDES)
AC_SUBST(GECODE_VERSION)
AC_SUBST(GECODE_MAJOR)


if test "$PKG_GECODE" = "packages/gecode"; then
AC_CONFIG_FILES([packages/gecode/Makefile])
fi