X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=rules.mk;h=fa929f9f5078593affca9c5ca166bd3fa2d1403b;hb=9b9ba6f035be8cdbd7c9fcbe770e7a34effb9172;hp=d79fcd3aa2ae799f92246e34a9dfe6038b242aea;hpb=a4814a69d3bca6ee05f4bfc4c4e965e8fcd544e6;p=karo-tx-uboot.git

diff --git a/rules.mk b/rules.mk
index d79fcd3aa2..fa929f9f50 100644
--- a/rules.mk
+++ b/rules.mk
@@ -25,17 +25,40 @@
 
 _depend:	$(obj).depend
 
-$(obj).depend:	$(src)Makefile $(TOPDIR)/config.mk $(SRCS) $(HOSTSRCS)
-		@rm -f $@
-		@touch $@
-		@for f in $(SRCS); do \
-			g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
-			$(CC) -M $(CPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
-		done
-		@for f in $(HOSTSRCS); do \
-			g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
-			$(HOSTCC) -M $(HOSTCPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
-		done
+# Split the source files into two camps: those in the current directory, and
+# those somewhere else. For the first camp we want to support CPPFLAGS_<fname>
+# and for the second we don't / can't.
+PWD_SRCS := $(filter $(notdir $(SRCS)),$(SRCS))
+OTHER_SRCS := $(filter-out $(notdir $(SRCS)),$(SRCS))
+
+# This is a list of dependency files to generate
+DEPS := $(basename $(patsubst %,$(obj).depend.%,$(PWD_SRCS)))
+
+# Join all the dependencies into a single file, in three parts
+#	1 .Concatenate all the generated depend files together
+#	2. Add in the deps from OTHER_SRCS which we couldn't process
+#	3. Add in the HOSTSRCS
+$(obj).depend:	$(src)Makefile $(TOPDIR)/config.mk $(DEPS) $(OTHER_SRCS) \
+		$(HOSTSRCS)
+	cat /dev/null $(DEPS) >$@
+	@for f in $(OTHER_SRCS); do \
+		g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
+		$(CC) -M $(CPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
+	done
+	@for f in $(HOSTSRCS); do \
+		g=`basename $$f | sed -e 's/\(.*\)\.[[:alnum:]_]/\1.o/'`; \
+		$(HOSTCC) -M $(HOSTCPPFLAGS) -MQ $(obj)$$g $$f >> $@ ; \
+	done
+
+MAKE_DEPEND = $(CC) -M $(CPPFLAGS) $(EXTRA_CPPFLAGS_DEP) \
+		-MQ $(addsuffix .o,$(obj)$(basename $<)) $< >$@
+
+
+$(obj).depend.%:	%.c
+	$(MAKE_DEPEND)
+
+$(obj).depend.%:	%.S
+	$(MAKE_DEPEND)
 
 $(HOSTOBJS): $(obj)%.o: %.c
 	$(HOSTCC) $(HOSTCFLAGS) $(HOSTCFLAGS_$(@F)) $(HOSTCFLAGS_$(BCURDIR)) -o $@ $< -c