Improved building of debugging objects. You can now specify a "DEBUG="

list for any build, e.g.
  make bin/pnic.dsk DEBUG=pci,pnic
This will drag in debugging-enabled versions of pci.c and pnic.c.

src/Makefile

 CFLAGS_c	+= 
 CFLAGS_S 	+= -DASSEMBLY
 
+# Base object name of the current target
+#
+OBJECT		= $(firstword $(subst ., ,$(@F)))
+
 # CFLAGS for specific object files.  You can define
 # e.g. CFLAGS_rtl8139, and have those flags automatically used when
 # compiling bin/rtl8139.o.
 #
-OBJ_CFLAGS	= $(CFLAGS_$(basename $(@F))) \
-		  -DOBJECT=$(subst -,_,$(basename $(@F)))
+OBJ_CFLAGS	= $(CFLAGS_$(OBJECT)) -DOBJECT=$(subst -,_,$(OBJECT))
 $(BIN)/%.flags :
 	@echo $(OBJ_CFLAGS)
 
 #
 COMPILE_c	= $(CC) $(CFLAGS) $(CFLAGS_c) $(OBJ_CFLAGS)
 RULE_c		= $(COMPILE_c) -c $< -o $@
-RULE_c_to_s	= $(COMPILE_c) -S -c $< -o $@ 
+RULE_c_to_dbg.o	= $(COMPILE_c) -DDEBUG_$(OBJECT) -c $< -o $@
 RULE_c_to_c	= $(COMPILE_c) -E -c $< > $@
+RULE_c_to_s	= $(COMPILE_c) -S -c $< -o $@ 
 
 PREPROCESS_S	= $(CPP) $(CFLAGS) $(CFLAGS_S) $(OBJ_CFLAGS)
 ASSEMBLE_S	= $(AS) $(ASFLAGS)
 RULE_S		= $(PREPROCESS_S) $< | $(ASSEMBLE_S) -o $@
 RULE_S_to_s	= $(PREPROCESS_S) $< > $@
 
-DEBUG_TARGETS	+= c s
+DEBUG_TARGETS	+= dbg.o c s
 
 # SRCDIRS lists all directories containing source files.
 #
-SRCDIRS		+= core drivers/net drivers/disk
+SRCDIRS		+= core drivers/bus drivers/net
+# drivers/disk
 
 # NON_AUTO_SRCS lists files that are excluded from the normal
 # automatic build system.
 #
 NON_AUTO_SRCS	+= core/elf_loader.c
+NON_AUTO_SRCS	+= drivers/net/prism2.c
 
 # Rules for finalising files.  TGT_MAKEROM_FLAGS is defined as part of
 # the automatic build system and varies by target; it includes the

src/Makefile.housekeeping

 		 $(foreach TGT,$(DEBUG_TARGETS), \
 		    $(if $(RULE_$(3)_to_$(TGT)), \
 		    '\n$$(BIN)/$(4).$(TGT) : $(1) $$(MAKEDEPS) $$($(4)_DEPS)' \
-		    '\n\t$$(RULE_$(3)_to_$(TGT))\n' ) ) \
+		    '\n\t$$(RULE_$(3)_to_$(TGT))\n' \
+		    '\n$(TGT)_OBJS += $$(BIN)/$(4).$(TGT)\n' ) ) \
 		 '\n$(2) : $$($(4)_DEPS)\n' \
 		 '\nTAGS : $$($(4)_DEPS)\n' \
 		>> $(2)
 TGT_MAKEROM_FLAGS = $(strip $(MAKEROM_FLAGS_$(TGT_ROM_NAME)) \
        $(if $(TGT_PCI_VENDOR),$(strip -p $(TGT_PCI_VENDOR),$(TGT_PCI_DEVICE))))
 
+# Calculate list of debugging versions of objects to be included in
+# 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) \
+)
+
 # Print out all derived information for a given target.
 #
 $(BIN)/%.info :
 	@echo 'LD target flags      : $(TGT_LD_FLAGS)'
 	@echo
 	@echo 'makerom target flags : $(TGT_MAKEROM_FLAGS)'
+	@echo
+	@echo 'Debugging objects    : $(DEBUG_OBJECTS)'
 
 # Build an intermediate object file from the objects required for the
 # specified target.
-#
-$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT)
-	$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $< -o $@ \
-		-Map $(BIN)/$*.tmp.map
+# 
+# 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, 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
 
 # Show a linker map for the specified target
 #
 	rm -f $(BIN)/$*
 	$(MAKE) $(MAKEFLAGS) $(BIN)/$*
 
-# Build a debugging version of an object
-#
-$(BIN)/%.o.dbg :
-	rm -f $(BIN)/$*.o
-	$(MAKE) $(MAKEFLAGS) EXTRA_CFLAGS+=-Ddebug_$* $(BIN)/$*.o
-
 # Clean-up
 #
 clean :