From a666eb34b56b4cea51cbe837d954e60b9c68c687 Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Sat, 16 Apr 2005 23:28:36 +0000
Subject: 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.housekeeping | 38 +++++++++++++++++++++++++++-----------
 1 file changed, 27 insertions(+), 11 deletions(-)

(limited to 'src/Makefile.housekeeping')

diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index c7bb1540..378435fa 100644
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -111,7 +111,8 @@ define obj_template
 		 $(foreach TGT,$(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)
@@ -222,6 +223,15 @@ TGT_LD_FLAGS	= $(foreach SYM,$(TGT_LD_PREFIX) $(TGT_LD_DRIVERS) obj_config,\
 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 :
@@ -242,13 +252,25 @@ $(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
 #
@@ -376,12 +398,6 @@ $(BIN)/%.rebuild :
 	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 :
-- 
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