+TDFiles := $(strip $(wildcard $(BUILD_SRC_DIR)/*.td) $(LLVM_SRC_ROOT)/lib/Target/Target.td)
+INCFiles := $(filter %.inc,$(BUILT_SOURCES))
+INCTMPFiles := $(INCFiles:%=$(ObjDir)/%.tmp)
+.PRECIOUS: $(INCTMPFiles) $(INCFiles)
+
+# All of these files depend on tblgen and the .td files.
+$(INCTMPFiles) : $(TBLGEN) $(TDFiles)
+
+# INCFiles rule: All of the tblgen generated files are emitted to
+# $(ObjDir)/%.inc.tmp, instead of emitting them directly to %.inc. This allows
+# us to only "touch" the real file if the contents of it change. IOW, if
+# tblgen is modified, all of the .inc.tmp files are regereated, but no
+# dependencies of the .inc files are, unless the contents of the .inc file
+# changes.
+$(INCFiles) : %.inc : $(ObjDir)/%.inc.tmp
+ $(Verb) $(CMP) -s $@ $< || $(CP) $< $@
+
+$(TARGET:%=$(ObjDir)/%GenRegisterNames.inc.tmp): \
+$(ObjDir)/%GenRegisterNames.inc.tmp : %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) register names with tblgen"
+ $(Verb) $(TableGen) -gen-register-enums -o $@ $<
+
+$(TARGET:%=$(ObjDir)/%GenRegisterInfo.h.inc.tmp): \
+$(ObjDir)/%GenRegisterInfo.h.inc.tmp : %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) register information header with tblgen"
+ $(Verb) $(TableGen) -gen-register-desc-header -o $@ $<
+
+$(TARGET:%=$(ObjDir)/%GenRegisterInfo.inc.tmp): \
+$(ObjDir)/%GenRegisterInfo.inc.tmp : %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) register info implementation with tblgen"
+ $(Verb) $(TableGen) -gen-register-desc -o $@ $<
+
+$(TARGET:%=$(ObjDir)/%GenInstrNames.inc.tmp): \
+$(ObjDir)/%GenInstrNames.inc.tmp : %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) instruction names with tblgen"
+ $(Verb) $(TableGen) -gen-instr-enums -o $@ $<
+
+$(TARGET:%=$(ObjDir)/%GenInstrInfo.inc.tmp): \
+$(ObjDir)/%GenInstrInfo.inc.tmp : %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) instruction information with tblgen"
+ $(Verb) $(TableGen) -gen-instr-desc -o $@ $<
+
+$(TARGET:%=$(ObjDir)/%GenAsmWriter.inc.tmp): \
+$(ObjDir)/%GenAsmWriter.inc.tmp : %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) assembly writer with tblgen"
+ $(Verb) $(TableGen) -gen-asm-writer -o $@ $<
+
+$(TARGET:%=$(ObjDir)/%GenAsmWriter1.inc.tmp): \
+$(ObjDir)/%GenAsmWriter1.inc.tmp : %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) assembly writer #1 with tblgen"
+ $(Verb) $(TableGen) -gen-asm-writer -asmwriternum=1 -o $@ $<
+
+$(TARGET:%=$(ObjDir)/%GenCodeEmitter.inc.tmp): \
+$(ObjDir)/%GenCodeEmitter.inc.tmp: %.td $(ObjDir)/.dir
+ $(Echo) "Building $(<F) code emitter with tblgen"
+ $(Verb) $(TableGen) -gen-emitter -o $@ $<