ocaml/Makefile.best_binaries

#**************************************************************************
#*                                                                        *
#*                                 OCaml                                  *
#*                                                                        *
#*            Gabriel Scherer, projet Parsifal, INRIA Saclay              *
#*                                                                        *
#*   Copyright 2019 Institut National de Recherche en Informatique et     *
#*     en Automatique.                                                    *
#*                                                                        *
#*   All rights reserved.  This file is distributed under the terms of    *
#*   the GNU Lesser General Public License version 2.1, with the          *
#*   special exception on linking described in the file LICENSE.          *
#*                                                                        *
#**************************************************************************

# This Makefile should be included.

# It expects:
# - Makefile.common to be included as well
# - a ROOTDIR variable pointing to the repository root
#   relative to the including Makefile

# It exports definitions of BEST_OCAML{C,OPT,LEX,DEP} commands that
# run to either the bytecode binary built in the repository or the
# native binary, if available. Note that they never use the boot/
# versions: we assume that ocamlc, ocamlopt, etc. have been run first.

define define_best
  ifeq "$(wildcard $(ROOTDIR)/$(3))" ""
  $(1)=$(CAMLRUN) $(ROOTDIR)/$(2)
  else
    ifeq "$(shell \
            if test $(ROOTDIR)/$(2) -nt $(ROOTDIR)/$(3); \
	    then echo 'stale'; else echo 'good'; fi)" "stale"
# the double-dollars ensure that the warning is displayed
# only if the conditional fires (by the `eval` call below)
# instead of always being shown as `define_best` is expanded.
$$(info Warning: we are not using the native binary $(3) \
because it is older than the bytecode binary $(2); \
you should silence this warning by either removing $(3) \
or rebuilding it (or `touch`-ing it) if you want it used.)
      $(1)=$(CAMLRUN) $(ROOTDIR)/$(2)
    else
      $(1)=$(ROOTDIR)/$(3)
    endif
  endif
endef

$(eval $(call define_best,BEST_OCAMLC,ocamlc,ocamlc.opt))
$(eval $(call define_best,BEST_OCAMLOPT,ocamlopt,ocamlopt.opt))
$(eval $(call define_best,BEST_OCAMLLEX,lex/ocamllex,lex/ocamllex.opt))

BEST_OCAMLDEP = $(BEST_OCAMLC) -depend