Force rebuilds on Makefile/.app.src changes

Everything will be rebuilt when the Makefile or any included
Makefile (like Erlang.mk or plugins) change.

Only the .app will be rebuilt when the .app.src file changes.

core/erlc.mk

@@ -183,6 +183,10 @@ $(PROJECT).d:: $(ERL_FILES) $(call core_find,include/,*.hrl)
 	$(makedep_verbose) $(call erlang,$(call makedep.erl,$@))
 endif
 
+# Rebuild everything when the Makefile changes.
+$(ERL_FILES) $(CORE_FILES) $(ASN1_FILES) $(MIB_FILES) $(XRL_FILES) $(YRL_FILES):: $(MAKEFILE_LIST)
+	@touch $@
+
 -include $(PROJECT).d
 
 ebin/$(PROJECT).app:: ebin/
@@ -195,8 +199,9 @@ define compile_erl
 		-pa ebin/ -I include/ $(filter-out $(ERLC_EXCLUDE_PATHS),$(COMPILE_FIRST_PATHS) $(1))
 endef
 
-ebin/$(PROJECT).app:: $(ERL_FILES) $(CORE_FILES)
-	$(if $(strip $?),$(call compile_erl,$?))
+ebin/$(PROJECT).app:: $(ERL_FILES) $(CORE_FILES) $(wildcard src/$(PROJECT).app.src)
+	$(eval FILES_TO_COMPILE := $(filter-out src/$(PROJECT).app.src,$?))
+	$(if $(strip $(FILES_TO_COMPILE)),$(call compile_erl,$(FILES_TO_COMPILE)))
 	$(eval GITDESCRIBE := $(shell git describe --dirty --abbrev=7 --tags --always --first-parent 2>/dev/null || true))
 	$(eval MODULES := $(patsubst %,'%',$(sort $(notdir $(basename \
 		$(filter-out $(ERLC_EXCLUDE_PATHS),$(ERL_FILES) $(CORE_FILES) $(BEAM_FILES)))))))

plugins/erlydtl.mk

@@ -42,6 +42,10 @@ else
 BEAM_FILES += $(addprefix ebin/,$(patsubst %.dtl,%_dtl.beam,$(notdir $(DTL_FILES))))
 endif
 
+# Rebuild templates when the Makefile changes.
+$(DTL_FILES): $(MAKEFILE_LIST)
+	@touch $@
+
 ebin/$(PROJECT).app:: $(DTL_FILES)
 	$(if $(strip $?),\
 		$(dtl_verbose) $(call erlang,$(call erlydtl_compile.erl,$?,-pa ebin/ $(DEPS_DIR)/erlydtl/ebin/)))

test/core_app.mk

@@ -1,6 +1,6 @@
 # Core: Building applications.
 
-CORE_APP_CASES = asn1 auto-git-id erlc-exclude erlc-opts erlc-opts-filter error generate-erl generate-erl-include generate-erl-prepend hrl hrl-recursive mib no-app no-makedep pt pt-erlc-opts xrl xrl-include yrl yrl-include
+CORE_APP_CASES = appsrc-change asn1 auto-git-id erlc-exclude erlc-opts erlc-opts-filter error generate-erl generate-erl-include generate-erl-prepend hrl hrl-recursive makefile-change mib no-app no-makedep pt pt-erlc-opts xrl xrl-include yrl yrl-include
 CORE_APP_TARGETS = $(addprefix core-app-,$(CORE_APP_CASES))
 CORE_APP_CLEAN_TARGETS = $(addprefix clean-,$(CORE_APP_TARGETS))
 
@@ -13,6 +13,27 @@ $(CORE_APP_CLEAN_TARGETS):
 
 core-app: $(CORE_APP_TARGETS)
 
+ifdef LEGACY
+core-app-appsrc-change: build clean-core-app-appsrc-change
+
+	$i "Bootstrap a new OTP application named $(APP)"
+	$t mkdir $(APP)/
+	$t cp ../erlang.mk $(APP)/
+	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap $v
+
+	$i "Build the application"
+	$t $(MAKE) -C $(APP) $v
+
+	$i "Touch the .app.src file; check that only the .app file gets rebuilt"
+	$t printf "%s\n" $(APP)/ebin/$(APP).app > $(APP)/EXPECT
+	$t $(SLEEP)
+	$t touch $(APP)/src/$(APP).app.src
+	$t $(SLEEP)
+	$t $(MAKE) -C $(APP) $v
+	$t find $(APP) -type f -newer $(APP)/src/$(APP).app.src | sort | diff $(APP)/EXPECT -
+	$t rm $(APP)/EXPECT
+endif
+
 core-app-asn1: build clean-core-app-asn1
 
 	$i "Bootstrap a new OTP library named $(APP)"
@@ -738,6 +759,31 @@ endif
 		[{module, M} = code:load_file(M) || M <- Mods], \
 		halt()"
 
+core-app-makefile-change: build clean-core-app-makefile-change
+
+	$i "Bootstrap a new OTP application named $(APP)"
+	$t mkdir $(APP)/
+	$t cp ../erlang.mk $(APP)/
+	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap $v
+
+	$i "Build the application"
+	$t $(MAKE) -C $(APP) $v
+
+	$i "Touch the Makefile; check that all files get rebuilt"
+	$t printf "%s\n" \
+		$(APP)/$(APP).d \
+		$(APP)/ebin/$(APP).app \
+		$(APP)/ebin/$(APP)_app.beam \
+		$(APP)/ebin/$(APP)_sup.beam \
+		$(APP)/src/$(APP)_app.erl \
+		$(APP)/src/$(APP)_sup.erl | sort > $(APP)/EXPECT
+	$t $(SLEEP)
+	$t touch $(APP)/Makefile
+	$t $(SLEEP)
+	$t $(MAKE) -C $(APP) $v
+	$t find $(APP) -type f -newer $(APP)/Makefile | sort | diff $(APP)/EXPECT -
+	$t rm $(APP)/EXPECT
+
 core-app-mib: build clean-core-app-mib
 
 	$i "Bootstrap a new OTP library named $(APP)"