[make] fewer phony dependencies

Summary:
This avoids rebuilding the man pages at every build. Also add a `byte_infer`
target to build infer in bytecode + the models, and an `opt` target, as I found
myself missing those.

Reviewed By: mbouaziz

Differential Revision: D6761008

fbshipit-source-id: ffedd4b

Makefile

@@ -196,11 +196,11 @@ ifeq ($(BUILD_C_ANALYZERS),yes)
 byte src_build src_build_common test_build: clang_plugin
 endif
 
-$(INFER_COMMAND_MANUALS): src_build Makefile
+$(INFER_COMMAND_MANUALS): $(INFER_BIN) $(MAKEFILE_LIST)
 	$(QUIET)$(MKDIR_P) $(@D)
 	$(QUIET)$(INFER_BIN) $(patsubst infer-%.1,%,$(@F)) --help --help-format=groff > $@
 
-$(INFER_MANUAL): src_build Makefile
+$(INFER_MANUAL): $(INFER_BIN) $(MAKEFILE_LIST)
 	$(QUIET)$(MKDIR_P) $(@D)
 	$(QUIET)$(INFER_BIN) --help --help-format=groff > $@
 
@@ -208,16 +208,22 @@ $(INFER_MANUALS_GZIPPED): %.gz: %
 	$(QUIET)$(REMOVE) $@
 	gzip $<
 
-infer_models: src_build
+infer_models: $(INFER_BIN)
 ifeq ($(BUILD_JAVA_ANALYZERS),yes)
-	$(QUIET)$(call silent_on_success,Building Java annotations,\
+	$(MAKE) -C $(ANNOTATIONS_DIR)
-	$(MAKE) -C $(ANNOTATIONS_DIR))
 endif
+	$(MAKE) -C $(MODELS_DIR) all
+
+.PHONY: infer byte_infer
+infer byte_infer:
 	$(QUIET)$(call silent_on_success,Building Infer models,\
-	$(MAKE) -C $(MODELS_DIR) all)
+	$(MAKE) infer_models $(INFER_MANUALS))
+infer: src_build
+byte_infer: byte
 
-.PHONY: infer
+.PHONY: opt
-infer: src_build $(INFER_MANUALS) infer_models
+opt:
+	$(QUIET)$(MAKE) BUILD_MODE=opt infer
 
 .PHONY: clang_setup
 clang_setup: