build(fiptool): add object dependency generation

The object target in the fiptool Makefile only depends on the
corresponding source file so it won't rebuild the object, if a header
file used by the source file is changed.

To make it rebuild the object file for both source and header file
changes, a dependency file will now be generated for each object and
included in the Makefile.

Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>
Change-Id: I0468c6e9c54126242150667268d471f28e011b0d

diff --git a/tools/fiptool/Makefile b/tools/fiptool/Makefile
index d7e0fe5bebec2751a397673cf2e89cf39ea6e6c9..ac262cdffb9dd1ddfba86bacabfe8495f9d908df 100644 (file)
--- a/tools/fiptool/Makefile
+++ b/tools/fiptool/Makefile
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014-2022, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2014-2023, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -61,6 +61,8 @@ ifneq (,$(wildcard ${PLAT_FIPTOOL_HELPER_MK}))
 include ${PLAT_FIPTOOL_HELPER_MK}
 endif
 
+DEPS := $(patsubst %.o,%.d,$(OBJECTS))
+
 .PHONY: all clean distclean --openssl
 
 all: ${PROJECT}
@@ -74,7 +76,9 @@ ${PROJECT}: --openssl ${OBJECTS} Makefile
 
 %.o: %.c Makefile
        @echo "  HOSTCC  $<"
-       ${Q}${HOSTCC} -c ${CPPFLAGS} ${HOSTCCFLAGS} ${INCLUDE_PATHS} $< -o $@
+       ${Q}${HOSTCC} -c ${CPPFLAGS} ${HOSTCCFLAGS} ${INCLUDE_PATHS} -MD -MP $< -o $@
+
+-include $(DEPS)
 
 --openssl:
 ifeq ($(DEBUG),1)
@@ -83,4 +87,4 @@ endif
 
 
 clean:
-       $(call SHELL_DELETE_ALL, ${PROJECT} ${OBJECTS})
+       $(call SHELL_DELETE_ALL, ${PROJECT} ${OBJECTS} $(DEPS))