Allow truly arbitrary debug levels to be specified via DEBUG=

src/Makefile

 #
 COMPILE_c	= $(CC) $(CFLAGS) $(CFLAGS_c) $(OBJ_CFLAGS)
 RULE_c		= $(COMPILE_c) -c $< -o $@
-RULE_c_to_dbg.o	= $(COMPILE_c) -Ddebug_$(OBJECT) -c $< -o $@
-RULE_c_to_dbg2.o = $(COMPILE_c) -Ddebug_$(OBJECT)=2 -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 -g0 -c $< -o $@ 
 
 RULE_S		= $(PREPROCESS_S) $< | $(ASSEMBLE_S) -o $@
 RULE_S_to_s	= $(PREPROCESS_S) $< > $@
 
-DEBUG_TARGETS	+= dbg2.o dbg.o c s
+DEBUG_TARGETS	+= dbg%.o c s
 
 # SRCDIRS lists all directories containing source files.
 #

src/Makefile.housekeeping

 #
 COMMA		:= ,
 DEBUG_LIST	= $(subst $(COMMA), ,$(DEBUG))
-DEBUG_OBJ_BASE	= $(word 1,$(subst :, ,$(1))).dbg$(word 2,$(subst :, ,$(1)))
+DEBUG_OBJ_LEVEL	= $(firstword $(word 2,$(subst :, ,$(1))) 1)
+DEBUG_OBJ_BASE	= $(word 1,$(subst :, ,$(1))).dbg$(call DEBUG_OBJ_LEVEL,$(1))
 DEBUG_OBJ	= $(BIN)/$(call DEBUG_OBJ_BASE,$(1)).o
 DEBUG_ORIG_OBJ	= $(BIN)/$(word 1,$(subst :, ,$(1))).o
 DEBUG_OBJS	= $(foreach D,$(DEBUG_LIST),$(call DEBUG_OBJ,$(D)))