[make] add `make byte` toplevel target

Summary:
`make byte` will populate infer/bin/ with bytecode version of each executable,
plus infer/bin/infer.byte (used to remember which of the native or byte
executables have been built most recently). `make infer` now also creates
infer/bin/infer.native, so that we're sure to replace the executables with
native/byte versions as appropriate.

This is to make debugging a tad easier:

  make byte
  ledit ocamldebug $(which infer) <infer args>

Whereas previously one had to:

  make -C infer/src byte
  ledit ocamldebug infer/_build/infer/backend/infer.byte <infer args>

Reviewed By: jberdine

Differential Revision: D4409476

fbshipit-source-id: ab5f57d

.gitignore

@@ -75,14 +75,8 @@ buck-out/
 .buckd/
 
 #other
-/infer/bin/InferAnalyze
-/infer/bin/InferClang
-/infer/bin/InferClang++
-/infer/bin/InferPrint
-
-/infer/bin/InferUnit
-/infer/bin/Typeprop
-/infer/bin/infer
+/infer/bin
+
 /infer/src/base/Version.ml
 /infer/models/java/models/
 /infer/models/java/models.jar

Makefile

@@ -55,8 +55,17 @@ ifeq ($(IS_FACEBOOK_TREE),yes)
 	@$(MAKE) -C facebook setup
 endif
 	@$(MAKE) -C $(SRC_DIR) infer
+
+.PHONY: byte
+byte:
+ifeq ($(IS_FACEBOOK_TREE),yes)
+	@$(MAKE) -C facebook setup
+endif
+	@$(MAKE) -C $(SRC_DIR) byte
+
 ifeq ($(BUILD_C_ANALYZERS),yes)
 src_build: clang_plugin
+byte: clang_plugin
 endif
 
 .PHONY: infer

infer/src/Makefile

@@ -181,7 +181,7 @@ $(BIN_DIR): Makefile
 	$(MKDIR_P) $@
 	@touch $@
 
-$(INFER_BIN): $(INFER_BUILD_DIR)/$(INFER_MAIN).native $(BIN_DIR)
+$(INFER_BIN).native: $(INFER_BUILD_DIR)/$(INFER_MAIN).native $(BIN_DIR)
 	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERANALYZE_MAIN).native $(INFERANALYZE_BIN)
 	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERPRINT_MAIN).native $(INFERPRINT_BIN)
 	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERUNIT_MAIN).native $(INFERUNIT_BIN)
@@ -189,9 +189,10 @@ ifeq ($(BUILD_C_ANALYZERS),yes)
 	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERCLANG_MAIN).native $(INFERCLANG_BIN)
 endif
 	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFER_MAIN).native $(INFER_BIN)
+	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFER_MAIN).native $(INFER_BIN).native
 
 .PHONY: infer
-infer: $(INFER_BIN)
+infer: $(INFER_BIN).native
 
 ifeq ($(BUILD_C_ANALYZERS),yes)
 infer: $(CLANG_BINIOU_DICT)
@@ -201,8 +202,18 @@ $(INFER_BUILD_DIR)/$(INFER_MAIN).byte: base/Version.ml $(BUILD_DIR) $(OCAML_ALL_
 	$(OCAMLBUILD_ALL) -build-dir $(INFER_BUILD_DIR) $(INFER_ALL_TARGETS:.native=.byte)
 	@touch $@
 
+$(INFER_BIN).byte: $(INFER_BUILD_DIR)/$(INFER_MAIN).byte $(BIN_DIR)
+	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERANALYZE_MAIN).byte $(INFERANALYZE_BIN)
+	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERPRINT_MAIN).byte $(INFERPRINT_BIN)
+	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERUNIT_MAIN).byte $(INFERUNIT_BIN)
+ifeq ($(BUILD_C_ANALYZERS),yes)
+	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFERCLANG_MAIN).byte $(INFERCLANG_BIN)
+endif
+	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFER_MAIN).byte $(INFER_BIN)
+	$(INSTALL_PROGRAM) $(INFER_BUILD_DIR)/$(INFER_MAIN).byte $(INFER_BIN).byte
+
 .PHONY: byte
-byte: $(INFER_BUILD_DIR)/$(INFER_MAIN).byte
+byte: $(INFER_BIN).byte
 
 # to build only the single module <Module> (and its dependencies) with extra flags execute:
 #   make MFLAGS=<flags> M=<Module>.cm{o,x} module