.PRECIOUS: $(YaccOutput)
+all:: $(YaccFiles:%.l=$(PROJ_SRC_DIR)/%.cpp.cvs)
+
# Cancel built-in rules for yacc
%.c: %.y
%.cpp: %.y
$(Verb) $(MV) -f $*.tab.h $(PROJ_SRC_DIR)/$*.h
$(Echo) "*** DON'T FORGET TO CHECK IN $*.cpp and $*.h (generated files)"
-YaccObjs := $(patsubst %.y,$(ObjDir)/%.o,$(YaccFiles))
-$(YaccObjs): $(ObjDir)/%.o : $(PROJ_SRC_DIR)/%.cpp
+# IFF the .y file has changed since it was last checked into CVS, copy the .y
+# file to .y.cvs and the generated .cpp/.h file to .cpp.cvs/.h.cvs. We use this
+# mechanism so that people without flex can build LLVM by copying the .cvs files
+# to the source location and building them.
+$(YaccFiles:%.y=$(PROJ_SRC_DIR)/%.cpp.cvs): \
+$(PROJ_SRC_DIR)/%.cpp.cvs: $(PROJ_SRC_DIR)/%.cpp
+ $(Verb) $(CMP) -s $@ $< || \
+ ($(CP) $< $@; \
+ $(CP) $(PROJ_SRC_DIR)/$*.l $(PROJ_SRC_DIR)/$*.l.cvs; \
+ $(CP) $(PROJ_SRC_DIR)/$*.h $(PROJ_SRC_DIR)/$*.h.cvs)
+
+
+$(YaccFiles:%.y=$(ObjDir)/%.o): $(ObjDir)/%.o : $(PROJ_SRC_DIR)/%.cpp
-YaccOutput := $(addprefix $(patsubst %.y,%,$(YaccFiles)),.output)
+YaccOutput := $(YaccFiles:%.y=%.output)
clean-local::
-$(Verb) $(RM) -f $(YaccOutput)