build: get dependency file directories from object file names

After commit dcff25f2cd8c11a9368cc2369aeb0319c32d9e26, Dependency file
are taken from the directories that have a Makefile.objs file.  This is
not enough, since files can be included from other directories.
So, pick them from directories that have an object file in them.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

Makefile

@@ -403,5 +403,5 @@ qemu-doc.dvi qemu-doc.html qemu-doc.info qemu-doc.pdf: \
 Makefile: $(GENERATED_HEADERS)
 
 # Include automatically generated dependency files
-# All subdir dependencies come automatically from our recursive subdir rules
--include $(wildcard *.d)
+# Dependencies in Makefile.objs files come from our recursive subdir rules
+-include $(wildcard *.d tests/*.d)

Makefile.dis

@@ -18,6 +18,3 @@ all: $(libdis-y)
 
 clean:
 	rm -f *.o *.d *.a *~
-
-# Include automatically generated dependency files
--include $(wildcard *.d)

Makefile.hw

@@ -21,6 +21,3 @@ all: $(hw-obj-y)
 clean:
 	rm -f $(addsuffix *.o, $(sort $(dir $(hw-obj-y))))
 	rm -f $(addsuffix *.d, $(sort $(dir $(hw-obj-y))))
-
-# Include automatically generated dependency files
--include $(patsubst %.o, %.d, $(hw-obj-y))

Makefile.target

@@ -214,6 +214,3 @@ endif
 
 GENERATED_HEADERS += config-target.h
 Makefile: $(GENERATED_HEADERS)
-
-# Include automatically generated dependency files
--include $(wildcard *.d fpu/*.d tcg/*.d)

Makefile.user

@@ -22,6 +22,3 @@ clean:
 	for d in . trace; do \
 	rm -f $$d/*.o $$d/*.d $$d/*.a $$d/*~; \
 	done
-
-# Include automatically generated dependency files
--include $(wildcard *.d)

rules.mak

@@ -94,7 +94,6 @@ define unnest-dir
 $(foreach var,$(nested-vars),$(call push-var,$(var),$1/))
 $(eval obj := $(obj)/$1)
 $(eval include $(SRC_PATH)/$1/Makefile.objs)
-$(eval -include $(wildcard $1/*.d))
 $(eval obj := $(patsubst %/$1,%,$(obj)))
 $(foreach var,$(nested-vars),$(call pop-var,$(var),$1/))
 endef
@@ -113,4 +112,6 @@ define unnest-vars
 $(call unnest-vars-1)
 $(foreach var,$(nested-vars),$(eval $(var) := $(filter-out %/, $($(var)))))
 $(shell mkdir -p $(sort $(foreach var,$(nested-vars),$(dir $($(var))))))
+$(foreach var,$(nested-vars), $(eval \
+  -include $(addsuffix *.d, $(sort $(dir $($(var)))))))
 endef