From 9fcc625416f26b2ff0629684139c766639dddf39 Mon Sep 17 00:00:00 2001
From: Grégoire Duchêne <gduchene@awhk.org>
Date: Sat, 27 Sep 2014 15:04:03 +0200
Subject: Split the dependency file

Each .ml file will have a dependency file instead of having a giant
one. Thus, we only generate dependencies for files that have changed.

The current pattern is that for every .ml file, like foo.ml, its
associated dependency file will be .foo.d. This may change or become
configurable later.
---
 gnu.ocaml.obj.mk | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/gnu.ocaml.obj.mk b/gnu.ocaml.obj.mk
index 496b29c..0933c11 100644
--- a/gnu.ocaml.obj.mk
+++ b/gnu.ocaml.obj.mk
@@ -26,13 +26,13 @@ ifdef EXCL
 _EXL=		$(foreach e, $(EXCL), -not -regex '.*$e.*')
 endif
 
-DEPFILE?=	.Makefile.dep
 MENHIR?=	menhir
 OCAMLDEP?=	ocamldep
 OCAMLLEX?=	ocamllex
 
 .DEFAULT_GOAL:=	obj
 
+_DEP=		$(foreach e,$(_SRC),$(dir $e)$(patsubst %.ml,.%.d,$(notdir $e)))
 _FND=		find
 _PAT=		'.*ml[ily]*.*'
 _SRC=		$(shell $(_FND) $(_FNDFLAGS))
@@ -78,30 +78,27 @@ _INT=		$(patsubst %.mly, %.ml, $(filter %.mly, $(_SRC)))
 _INT+=		$(patsubst %.mll, %.ml, $(filter %.mll, $(_SRC)))
 _CLN+=		$(patsubst %.ml, %.mli, $(_INT))
 
--include $(DEPFILE)
+-include $(_DEP)
 
-$(_OBJ):	$(DEPFILE)
-
-$(DEPFILE):	$(_SRC) $(_INT)
-	$(OCAMLDEP) $(_INC) $(_SRC) > $(DEPFILE)
+.%.d:		%.ml
+	$(OCAMLDEP) $(_INC) $< > $@
 
 all:		$(_OBJ)
 
 clean:
 	$(RM) $(_CLN) $(_INT) $(_OBJ) $(PROG)
 
-dep:
-	$(OCAMLDEP) $(_INC) $(_SRC) > $(DEPFILE)
+dep:		$(_DEP)
 
 dist-clean:	clean
-	$(RM) $(DEPFILE)
+	$(RM) $(_DEP)
 
 obj:		$(_OBJ)
 
 .PHONY:		dep
 
 ifndef OSTUMAKE_DEBUG
-.SILENT:	$(DEPFILE) dep
+.SILENT:	$(_DEP)
 endif
 
 .SUFFIXES:
-- 
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