gmake.mk: get rid of unicode normalization table timestamp

* common.mk, defs/gmake.mk: rid of unicode normalization tables
  timestamp.  update the target tables file only when only it
  exists.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67438 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -1371,12 +1371,14 @@ touch-unicode-files:
 	$(MAKEDIRS) $(UNICODE_SRC_DATA_DIR)
 	touch $(UNICODE_SRC_DATA_DIR)/.unicode-tables.time $(UNICODE_DATA_HEADERS)
 
+UNICODE_TABLES_TIMESTAMP = yes
 $(UNICODE_SRC_DATA_DIR)/.unicode-tables.time: $(srcdir)/tool/generic_erb.rb \
 		$(srcdir)/template/unicode_norm_gen.tmpl \
 		$(ALWAYS_UPDATE_UNICODE:yes=update-unicode)
 	$(Q) $(MAKE) $(@D)
 	$(Q) $(BASERUBY) $(srcdir)/tool/generic_erb.rb \
-		-c -t$@ -o $(srcdir)/lib/unicode_normalize/tables.rb \
+		-c $(UNICODE_TABLES_TIMESTAMP:yes=-t$@) \
+                -o $(srcdir)/lib/unicode_normalize/tables.rb \
 		-I $(srcdir) \
 		$(srcdir)/template/unicode_norm_gen.tmpl \
 		$(UNICODE_DATA_DIR) lib/unicode_normalize

defs/gmake.mk

@@ -185,8 +185,13 @@ $(MJIT_MIN_HEADER): $(mjit_min_headers) $(PREP)
 
 endif
 
-ifneq ($(wildcard $(UNICODE_FILES) $(UNICODE_PROPERTY_FILES)),)
+ifeq ($(if $(wildcard $(UNICODE_FILES) $(UNICODE_PROPERTY_FILES)),,\
+	   $(wildcard $(srcdir)/lib/unicode_normalize/tables.rb)),)
+# Needs the dependency when any Unicode data file exists, or
+# normalization tables script doesn't.  Otherwise, when the target
+# only exists, use it as-is.
 .PHONY: $(UNICODE_SRC_DATA_DIR)/.unicode-tables.time
+UNICODE_TABLES_TIMESTAMP =
 $(UNICODE_SRC_DATA_DIR)/.unicode-tables.time: \
 	$(UNICODE_FILES) $(UNICODE_PROPERTY_FILES)
 endif