dnl
dnl Author  : Don Stewart <dons@cse.unsw.edu.au>
dnl Created : Sun Aug 18 11:38:32 EST 2002
dnl Last mod: Thu Feb 27 14:50:10 EST 2003
dnl

dnl sanity test
AC_INIT(main/Main.hs)

dnl Some necessary tools
AC_PATH_PROG(GHC,ghc)
if test -z "$GHC" ; then
    AC_MSG_ERROR([You need the GHC to build the stgjvm project!])
fi

AC_PATH_PROG(HAPPY,happy)
if test -z "$HAPPY" ; then
    AC_MSG_ERROR([You need Happy to build the stgjvm project!])
fi

AC_PATH_PROG(MAKE,make)
if test -z "$MAKE" ; then
    AC_MSG_ERROR([Holy guacamole! No make!])
fi
AC_PATH_PROG(SHELL,sh)
if test -z "$SHELL" ; then
    AC_MSG_ERROR([Holy guacamole! No sh! What kind of OS is this?])
fi
AC_PATH_PROG(PERL,perl)
if test -z "$PERL" ; then
    echo "You'll need perl if you want to test the compiler."
fi
AC_PATH_PROG(SED,sed)
if test -z "$SED" ; then
    AC_MSG_ERROR([Adios compadre! Sed is dead. Or missing...])
fi
AC_PATH_PROG(CP,cp)
if test -z "$CP" ; then
    AC_MSG_ERROR([What the?! No cp!])
fi
AC_PATH_PROG(FIND,find)
if test -z "$FIND" ; then
    AC_MSG_ERROR([What the?! No find!])
fi
AC_PATH_PROG(DIFF,diff)
if test -z "$DIFF" ; then
    echo "You'll need diff if you want to test the compiler."
fi
AC_PATH_PROG(LATEX,latex)
if test -z "$LATEX" ; then
    echo "You'll need latex if you want to build the documentation."
fi
AC_PATH_PROG(DVIPS,dvips)
if test -z "$DVIPS" ; then
    echo "You'll need dvips if you want postscript documentation."
fi

dnl From the CTK configure script, cheers Manuel.
dnl Check GHC's details.
dnl
dnl What we are interested in is whether  we can use -ga with happy.
dnl which means we need 5.02 >
dnl
dnl I also suspect that it would be hard for people with GHC < 4.08, so
dnl we set that as an (arbitrary) limit on things
dnl
if test -x "$GHC"; then
    dnl Getting the version number is a bit subtle, as GHC insists on
    dnl omitting the patchlevel for patchlevel 0 - so, there may be two
    dnl or three numbers.
    AC_CACHE_CHECK([ghc version], prog_ghc_version, [
        prog_ghc_version=`$GHC --version 2>&1 |\
                $PERL -pe 's/.* (\d+)\.(\d+).*/\1.\2/'`
    ])
    MAJOR=`echo $prog_ghc_version | $PERL -pe 's/(\d+).*/\1/'`
    MINOR=`echo $prog_ghc_version | $PERL -pe 's/\d+.(\d+).*/\1/'`
    if test $MAJOR -ne 6 ; then
        AC_MSG_ERROR([I decree that you need at least version 6.00 GHC!])
    fi
fi

dnl
dnl the whole point of this excerise was to determine if we can use -ga,
dnl without resorting to hacky, non-platform independent tricks.thus:
dnl
if test $MAJOR -eq 5 -a $MINOR -ge 2 ; then
    HAPPY_FLAGS="-ga"
fi

dnl
dnl needed by hs2java
dnl
BIN_DIR=`pwd`

dnl write out some vars
AC_SUBST(HAPPY_FLAGS)
AC_SUBST(BIN_DIR)

dnl write up our results
AC_CONFIG_FILES(Makefile parser/Makefile doc/Makefile util/check util/happytex util/stgpp driver/hsjava)
AC_CONFIG_COMMANDS([default], [chmod 700 util/check util/happytex util/stgpp driver/hsjava] )
AC_OUTPUT