Only regenerate the .inc file if IT has changed, not just if the .td files

have changed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7414 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/SparcV9/Makefile b/lib/Target/SparcV9/Makefile
index f48f0cd6e9c9d3a39e8e17b5beff9f9f1209b245..5c8532a6f4eccaa4476ec279716a49acf9cf2409 100644 (file)
--- a/lib/Target/SparcV9/Makefile
+++ b/lib/Target/SparcV9/Makefile
@@ -43,9 +43,18 @@ $(BUILD_OBJ_DIR)/Depend/Sparc.burm.d: $(BUILD_OBJ_DIR)/Depend/.dir
 
 SparcV9CodeEmitter.cpp: SparcV9CodeEmitter.inc
 
-SparcV9CodeEmitter.inc: SparcV9.td SparcV9_F2.td SparcV9_F3.td SparcV9_F4.td SparcV9_Reg.td $(TBLGEN)
-       @${ECHO} "TableGen-erating $@"
-       $(CC) -E -xc -P SparcV9.td | $(TBLGEN) -gen-emitter -o $@
+
+TARGET_NAME := SparcV9
+
+TABLEGEN_FILES := $(wildcard *.td)
+
+$(TARGET_NAME)CodeEmitter.inc.tmp: $(TABLEGEN_FILES) $(TBLGEN)
+       @${ECHO} "TableGen-erating " $(TARGET_NAME)
+       $(CC) -E -xc -P $(TARGET_NAME).td | $(TBLGEN) -gen-emitter -o $@
+
+$(TARGET_NAME)CodeEmitter.inc: $(TARGET_NAME)CodeEmitter.inc.tmp
+       $(VERB) # Only copy over the real .inc file if it has changed!
+       $(VERB) diff $@ $< > /dev/null || cp $< $@
 
 clean::
-       ${RM} -f SparcV9CodeEmitter.inc
+       ${RM} -f $(TARGET_NAME)CodeEmitter.inc $(TARGET_NAME)CodeEmitter.inc.tmp