Add make target for module dependency graph

Summary:public
This extends infer/src/Makefile with a mod_dep.dot target that builds a
dot graph of module dependencies.

This also adds ocamldot, which is in the public domain and available
from http://trevorjim.com/projects/ocamldot/ocamldot.tar .

Reviewed By: cristianoc

Differential Revision: D3168488

fb-gh-sync-id: 267fb0e
fbshipit-source-id: 267fb0e

.gitignore

@@ -123,3 +123,6 @@ buck-out/
 /infer/annotations/processor_classes/
 /infer/lib/java/processor.jar
 infer/src/.project
+/dependencies/ocamldot/ocamldot
+/dependencies/ocamldot/ocamldot.ml
+/infer/src/mod_dep.dot

Makefile.in

@@ -150,6 +150,7 @@ test:
 	$(MAKE) -C $(INFER_DIR) $(INFER_BIN)
 	$(MAKE) -C $(SRC_DIR) init
 	$(MAKE) -j$(NCPU) test_build
+	$(MAKE) -C $(SRC_DIR) mod_dep.dot
 	$(MAKE) ocaml_unit_test buck_test inferTraceBugs_test
 
 test_xml: buck_test_xml

infer/src/Makefile.in

@@ -192,6 +192,19 @@ test_build: init $(INFERPRINT_ATDGEN_STUBS) $(CLANG_ATDGEN_STUBS) $(INFER_CLANG_
 	  $(INFERUNIT_MAIN).byte \
 	  $(CHECKCOPYRIGHT_MAIN).byte
 
+$(DEPENDENCIES_DIR)/ocamldot/ocamldot:
+	$(MAKE) -C $(DEPENDENCIES_DIR)/ocamldot
+
+roots:=Inferanalyze CMain JMain Inferprint
+src_dirs:=$(shell find * -type d)
+src_files:=$(shell find $(src_dirs) -regex '.*\.ml\(i\)*' -not -path facebook/scripts/eradicate_stats.ml)
+inc_flags:=$(foreach dir,$(src_dirs),-I $(dir))
+root_flags:=$(foreach root,$(roots),-r $(root))
+mod_dep.dot: $(DEPENDENCIES_DIR)/ocamldot/ocamldot $(src_files)
+	ocamldep.opt $(inc_flags) $(src_files) \
+	| $(DEPENDENCIES_DIR)/ocamldot/ocamldot -lr $(root_flags) \
+        > mod_dep.dot
+
 ifeq (@ENABLE_OCAML_ANNOT@,yes)
 java_annotations: build_java
 	rsync -a --include '*/' --include '*.annot' --exclude '*' $(JAVA_BUILD_DIR)/ $(ANNOT_DIR)/
@@ -312,3 +325,4 @@ endif
 	$(REMOVE) $(INFERANALYZE_BIN) $(INFERPRINT_BIN) $(CHECKCOPYRIGHT_BIN)
 	$(REMOVE) $(CLANG_ATDGEN_STUBS)
 	$(REMOVE) $(INFER_CLANG_FCP_MIRRORED_FILES)
+	$(REMOVE) mod_dep.dot