make: automatically include dependencies in recursive subdir rules (v2)

I think I understand enough of what's going on in these rules to ensure this is
right.  But I could certainly use a second or third opinion...

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/rules.mak b/rules.mak
index 4bc5e52fa3..60f3e96541 100644
--- a/rules.mak
+++ b/rules.mak
@@ -94,6 +94,7 @@ 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