[build] Avoid always rebuilding bin/embedded.o

bin/embedded.o has a build dependency on bin/.embedded.list, which
gets generated automatically by the Makefile.  However, if the
EMBEDDED_IMAGE list is empty, bin/.embedded.list will never be
created, and so bin/embedded.o will be rebuilt every time due to a
missing dependency.

Fix by forcing bin/.embedded.list to be created even if the list is
empty.

diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index 23ef8c6..71592db 100644 (file)
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -474,7 +474,7 @@ roms :
 #
 EMBEDDED_LIST  := $(BIN)/.embedded.list
 ifeq ($(wildcard $(EMBEDDED_LIST)),)
-EMBEDDED_LIST_IMAGE :=
+EMBEDDED_LIST_IMAGE := <invalid>
 else
 EMBEDDED_LIST_IMAGE := $(shell cat $(EMBEDDED_LIST))
 endif
@@ -609,7 +609,7 @@ $(BIN)/%.info :
 #
 BLIB_LIST      := $(BIN)/.blib.list
 ifeq ($(wildcard $(BLIB_LIST)),)
-BLIB_LIST_OBJS :=
+BLIB_LIST_OBJS := <invalid>
 else
 BLIB_LIST_OBJS := $(shell cat $(BLIB_LIST))
 endif