Merge "Use a dependency file to replace the list file."

inc := $(call intermediates-dir-for,PACKAGING,updater_extensions)/register.inc

# During the first pass of reading the makefiles, we dump the list of

# extension libs to a temp file, then copy that to the ".list" file if

# it is different than the existing .list (if any).  The register.inc

# file then uses the .list as a prerequisite, so it is only rebuilt

# (and updater.o recompiled) when the list of extension libs changes.

junk := $(shell mkdir -p $(dir $(inc));\

	        echo $(TARGET_RECOVERY_UPDATER_LIBS) > $(inc).temp;\

	        diff -q $(inc).temp $(inc).list 2>/dev/null || cp -f $(inc).temp $(inc).list)

# Encode the value of TARGET_RECOVERY_UPDATER_LIBS into the filename of the dependency.

# So if TARGET_RECOVERY_UPDATER_LIBS is changed, a new dependency file will be generated.

# Note that we have to remove any existing depency files before creating new one,

# so no obsolete dependecy file gets used if you switch back to an old value.

inc_dep_file := $(inc).dep.$(subst $(space),-,$(sort $(TARGET_RECOVERY_UPDATER_LIBS)))

$(inc_dep_file): stem := $(inc).dep

$(inc_dep_file) :

	$(hide) mkdir -p $(dir $@)

	$(hide) rm -f $(stem).*

	$(hide) touch $@

$(inc) : libs := $(TARGET_RECOVERY_UPDATER_LIBS)

$(inc) : $(inc).list

$(inc) : $(inc_dep_file)

	$(hide) mkdir -p $(dir $@)

	$(hide) echo "" > $@

	$(hide) $(foreach lib,$(libs),echo "extern void Register_$(lib)(void);" >> $@;)

$(call intermediates-dir-for,EXECUTABLES,updater)/updater.o : $(inc)

LOCAL_C_INCLUDES += $(dir $(inc))

inc :=

inc_dep_file :=

LOCAL_MODULE := updater

LOCAL_FORCE_STATIC_EXECUTABLE := true