dnl autoconf macros for OCaml
dnl by Olivier Andrieu
dnl modified by Richard W.M. Jones
dnl from a configure.in by Jean-Christophe Filliātre,
dnl from a first script by Georges Mariano
dnl
dnl defines AC_PROG_OCAML that will check the OCaml compiler
dnl and set the following variables :
dnl   OCAMLC        "ocamlc" if present in the path, or a failure
dnl                 or "ocamlc.opt" if present with same version number as ocamlc
dnl   OCAMLOPT      "ocamlopt" (or "ocamlopt.opt" if present), or "no"
dnl   OCAMLBEST     either "byte" if no native compiler was found, 
dnl                 or "opt" otherwise
dnl   OCAMLDEP      "ocamldep"
dnl   OCAMLLIB      the path to the ocaml standard library
dnl   OCAMLVERSION  the ocaml version number
AC_DEFUN(AC_PROG_OCAML,
[dnl
# checking for ocamlc
AC_CHECK_PROG(OCAMLC,ocamlc,ocamlc,AC_MSG_ERROR(Cannot find ocamlc.))
OCAMLVERSION=`$OCAMLC -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
AC_MSG_RESULT(OCaml version is $OCAMLVERSION)
OCAMLLIB=`$OCAMLC -where 2>/dev/null || $OCAMLC -v|tail -1|cut -d ' ' -f 4`
AC_MSG_RESULT(OCaml library path is $OCAMLLIB)
# checking for ocamlopt
AC_CHECK_PROG(OCAMLOPT,ocamlopt,ocamlopt)
OCAMLBEST=byte
if test -z "$OCAMLOPT"; then
	AC_MSG_WARN(Cannot find ocamlopt; bytecode compilation only.)
else
	TMPVERSION=`$OCAMLOPT -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
	if test "$TMPVERSION" != "$OCAMLVERSION" ; then
	    AC_MSG_RESULT(versions differs from ocamlc; ocamlopt discarded.)
	    unset OCAMLOPT
	else
	    OCAMLBEST=opt
	fi
fi
# checking for ocamlc.opt
AC_CHECK_PROG(OCAMLCDOTOPT,ocamlc.opt,ocamlc.opt)
if test -z "$OCAMLCDOTOPT"; then
	TMPVERSION=`$OCAMLCDOTOPT -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
	if test "$TMPVERSION" != "$OCAMLVERSION" ; then
	    AC_MSG_RESULT(versions differs from ocamlc; ocamlc.opt discarded.)
	else
	    OCAMLC=$OCAMLCDOTOPT
	fi
fi
# checking for ocamlopt.opt
if test "$OCAMLOPT" ; then
    AC_CHECK_PROG(OCAMLOPTDOTOPT,ocamlopt.opt,ocamlopt.opt)
    if test "$OCAMLOPTDOTOPT"; then
	TMPVER=`$OCAMLOPTDOTOPT -v | sed -n -e 's|.*version* *\(.*\)$|\1|p' `
	if test "$TMPVER" != "$OCAMLVERSION" ; then
	    AC_MSG_RESULT(version differs from ocamlc; ocamlopt.opt discarded.)
	else
	    OCAMLOPT=$OCAMLOPTDOTOPT
	fi
    fi
fi
# checking for ocamldep
AC_CHECK_PROG(OCAMLDEP,ocamldep,ocamldep,AC_MSG_ERROR(Cannot find ocamldep.))

#checking for ocamlmktop
AC_CHECK_PROG(OCAMLMKTOP,ocamlmktop,ocamlmktop, AC_MSG_WARN(Cannot find ocamlmktop.))
#checking for ocamlmklib
AC_CHECK_PROG(OCAMLMKLIB,ocamlmklib,ocamlmklib, AC_MSG_WARN(Cannot find ocamlmklib.))
# checking for ocamldoc
AC_CHECK_PROG(OCAMLDOC,ocamldoc,ocamldoc, AC_MSG_WARN(Cannot find ocamldoc.))


AC_SUBST(OCAMLC)
AC_SUBST(OCAMLOPT)
AC_SUBST(OCAMLDEP)
AC_SUBST(OCAMLBEST)
AC_SUBST(OCAMLVERSION)
AC_SUBST(OCAMLLIB)
AC_SUBST(OCAMLMKLIB)
AC_SUBST(OCAMLDOC)
])


dnl macro AC_PROG_OCAML_TOOLS will check OCamllex and OCamlyacc :
dnl   OCAMLLEX      "ocamllex" or "ocamllex.opt" if present
dnl   OCAMLYACC     "ocamlyac"
AC_DEFUN(AC_PROG_OCAML_TOOLS,
[dnl
# checking for ocamllex and ocamlyacc
AC_CHECK_PROG(OCAMLLEX,ocamllex,ocamllex)
if test "$OCAMLLEX"; then
    AC_CHECK_PROG(OCAMLLEXDOTOPT,ocamllex.opt,ocamllex.opt)
    if test "$OCAMLLEXDOTOPT"; then
	OCAMLLEX=$OCAMLLEXDOTOPT
    fi
else
	AC_MSG_ERROR(Cannot find ocamllex.)
fi
AC_CHECK_PROG(OCAMLYACC,ocamlyacc,ocamlyacc,AC_MSG_ERROR(Cannot find ocamlyacc.))
AC_SUBST(OCAMLLEX)
AC_SUBST(OCAMLYACC)
])


dnl AC_PROG_CAMLP4 checks for Camlp4
AC_DEFUN(AC_PROG_CAMLP4,
[dnl
AC_REQUIRE([AC_PROG_OCAML])
# checking for camlp4
AC_CHECK_PROG(CAMLP4,camlp4,camlp4)
if test "$CAMLP4"; then
	TMPVERSION=`$CAMLP4 -v 2>&1| sed -n -e 's|.*version *\(.*\)$|\1|p'`
	if test "$TMPVERSION" != "$OCAMLVERSION" ; then
	    AC_MSG_RESULT(versions differs from ocamlc)
	fi
fi
])


dnl macro AC_PROG_FINDLIB will check for the presence of
dnl   ocamlfind
AC_DEFUN(AC_PROG_FINDLIB,
[dnl
# checking for ocamlfind
AC_CHECK_PROG(OCAMLFIND,ocamlfind,ocamlfind,
	AC_MSG_WARN([ocamlfind not found]))
AC_SUBST(OCAMLFIND)
])


dnl AC_CHECK_OCAML_PKG checks wether a findlib package is present
dnl   defines pkg_name to "yes"
AC_DEFUN(AC_CHECK_OCAML_PKG,
[dnl
AC_REQUIRE([AC_PROG_FINDLIB])
AC_MSG_CHECKING(findlib package $1)
if $OCAMLFIND query $1 >/dev/null 2>/dev/null; then
AC_MSG_RESULT(found)
eval "pkg_`echo $1 | tr - _`=yes"
else
AC_MSG_RESULT(not found)
eval "pkg_`echo $1 | tr - _`=no"
fi
])


dnl AC_CHECK_OCAML_MODULE looks for a module in a given path
dnl 1st arg -> name (just for printing messages)
dnl 2nd arg -> env var name (set to include path, or "no" if not found)
dnl 3rd arg -> module to check
dnl 4th arg -> default include dirs to check
AC_DEFUN([AC_CHECK_OCAML_MODULE],
[dnl
AC_MSG_CHECKING(for module $1)
cat > conftest.ml <<EOF
open $3
EOF
unset found
for $2 in $$2 $4 ; do
  if $OCAMLC -c -I "$$2" conftest.ml >&5 2>&5 ; then
    found=yes
    break
  fi
done
if test "$found" ; then
  AC_MSG_RESULT($$2)
else
  AC_MSG_RESULT(not found)
  $2=no
fi
AC_SUBST($2)])