"make xxx DEBUG=yyy,zzz" now working, but the "up to date" message is

getting suppressed.  :(

src/Makefile.housekeeping

@@ -158,13 +158,6 @@ $(BIN)/NIC : $(AUTO_DEPS)
 	@perl -ne 'chomp; print "$$1\n" if /\# NIC\t(.*)$$/' $^ >> $@
 CLEANUP		+= $(BIN)/NIC
 
-# Library of all objects
-#
-$(BLIB) : $(BOBJS)
-	$(AR) r $@ $(BOBJS)
-	$(RANLIB) $@
-blib : $(BLIB)
-
 # Analyse a target name (e.g. "bin/dfe538--prism2_pci.zrom.tmp") and
 # derive the variables:
 # 
@@ -232,10 +225,9 @@ TGT_MAKEROM_FLAGS = $(strip $(MAKEROM_FLAGS_$(TGT_ROM_NAME)) \
 # the target.
 #
 COMMA		:= ,
-DEBUG_OBJECTS	= $(foreach D,$(subst $(COMMA), ,$(DEBUG)),$(BIN)/$(D).dbg.o)
-$(foreach OBJ,$(filter-out $(dbg.o_OBJS),$(DEBUG_OBJECTS)), \
-	$(error $(OBJ) is not a valid debug object) \
-)
+DEBUG_OBJS	= $(foreach D,$(subst $(COMMA), ,$(DEBUG)),$(BIN)/$(D).dbg.o)
+DEBUG_REPLACE_OBJS = $(foreach D,$(subst $(COMMA), ,$(DEBUG)),$(BIN)/$(D).o)
+BLIB_OBJS	= $(DEBUG_OBJS) $(filter-out $(DEBUG_ORIG_OBJS),$(BOBJS))
 
 # Print out all derived information for a given target.
 #
@@ -258,25 +250,33 @@ $(BIN)/%.info :
 	@echo
 	@echo 'makerom target flags : $(TGT_MAKEROM_FLAGS)'
 	@echo
-	@echo 'Debugging objects    : $(DEBUG_OBJECTS)'
+	@echo 'Debugging objects    : $(DEBUG_OBJS)'
+	@echo 'Replaced objects     : $(DEBUG_REPLACE_OBJS)'
+
+# List of objects included in the last build of blib.  This is needed
+# in order to correctly rebuild blib whenever the list of objects
+# changes.
+#
+BLIB_LIST	= $(BIN)/.blib.list
+.PHONY : always_check_blib_list
+$(BLIB_LIST) : always_check_blib_list
+	@[ "$(shell cat $@)" = "$(BLIB_OBJS)" ] || echo "$(BLIB_OBJS)" > $@
+.SECONDARY : $(BLIB_LIST)
+
+# Library of all objects
+#
+BLIB		= $(BIN)/blib.a
+$(BLIB) : $(BLIB_OBJS) $(BLIB_LIST) $(MAKEDEPS)
+	$(AR) r $@ $(BLIB_OBJS)
+	$(RANLIB) $@
+blib : $(BLIB)
 
 # Build an intermediate object file from the objects required for the
 # specified target.
-# 
-# If it's a debugging version, force a link to take place by making
-# this target depend on a phony target, and mark the resulting files
-# as being older than BLIB (and prevent them from being deleted), so
-# that any subsequent images will do a fresh link.  Otherwise, you
-# won't get what you expect when you do e.g. "make DEBUG=pci
-# bin/pnic.dsk ; make bin/pnic.dsk ; make DEBUG=pci bin/pnic.dsk"
-#
-$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT) \
-	       $(DEBUG_OBJECTS) $(if $(DEBUG),force_relink)
-	$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) \
-		$(DEBUG_OBJECTS) $(BLIB) -o $@ -Map $(BIN)/$*.tmp.map
-	$(if $(DEBUG_OBJECTS),$(TOUCH) -r $(BLIB) -B 2 $@ $(BIN)/$*.tmp.map)
-.PHONY : force_relink
-.SECONDARY :
+#
+$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT) 
+	$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $(BLIB) -o $@ \
+		-Map $(BIN)/$*.tmp.map
 
 # Show a linker map for the specified target
 #