Rework the vboot_reference make system.

utility/Makefile

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-FWDIR ?= ../vboot_firmware/
-TOP ?= ../
-CC ?= gcc
-CXX ?= g++
 INCLUDES += -I./include \
                 -I$(FWDIR)/lib/include \
                 -I$(FWDIR)/lib/cgptlib/include \
                 -I$(FWDIR)/lib/cryptolib/include \
                 -I$(HOSTDIR)/include \
                 -I../misclibs/include \
                 -I../vfirmware/include\
                 -I../vboot_firmware/include\
                 -I../vkernel/include
-CFLAGS ?= -Wall -DNDEBUG -O3 -Werror $(INCLUDES)
-LIBS = $(TOP)/misclibs/file_keys.o \
-        $(TOP)/misclibs/signature_digest.o \
-        $(TOP)/vfirmware/firmware_image.o \
-        $(TOP)/vkernel/kernel_image.o \
+CFLAGS += $(INCLUDES)
+CFLAGS += -MMD -MF $@.d
+LIBS = $(BUILD)/misclibs/file_keys.o \
+        $(BUILD)/misclibs/signature_digest.o \
+        $(BUILD)/vfirmware/firmware_image.o \
+        $(BUILD)/vkernel/kernel_image.o \
         $(HOSTLIB) \
         $(FWLIB)
 
+BUILD_ROOT = ${BUILD}/utility
+
 DESTDIR ?= /usr/bin
 
-TARGET_BINS = dumpRSAPublicKey \
+TARGET_NAMES = dumpRSAPublicKey \
                 firmware_utility \
                 gbb_utility \
                 kernel_utility \
                 load_kernel_test \
                 signature_digest_utility \
                 vbutil_key \
                 vbutil_kernel \
                 vbutil_keyblock \
                 verify_data
 
+TARGET_BINS = $(addprefix ${BUILD_ROOT}/,$(TARGET_NAMES))
+ALL_DEPS = $(addsuffix .d,${TARGET_BINS})
+
 all: $(TARGET_BINS)
 
-dumpRSAPublicKey: dumpRSAPublicKey.c
+${BUILD_ROOT}/dumpRSAPublicKey: dumpRSAPublicKey.c
         $(CC) $(CFLAGS) $(INCLUDES) $< -o $@ -lcrypto
 
-firmware_utility: firmware_utility.cc $(LIBS)
+${BUILD_ROOT}/firmware_utility: firmware_utility.cc $(LIBS)
         $(CXX) $(CFLAGS) $(INCLUDES) -ggdb -D__STDC_LIMIT_MACROS $< \
         -o $@ $(LIBS) -lcrypto
 
-gbb_utility: gbb_utility.cc 
-        $(CXX) -DWITH_UTIL_MAIN $(CFLAGS) $(INCLUDES) $< -o $@
+${BUILD_ROOT}/gbb_utility: gbb_utility.cc
+        $(CXX) -DWITH_UTIL_MAIN $(CFLAGS) $< -o $@
 
-load_kernel_test: load_kernel_test.c $(LIBS)
+${BUILD_ROOT}/load_kernel_test: load_kernel_test.c $(LIBS)
         $(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(LIBS) -lcrypto
 
-kernel_utility: kernel_utility.cc $(LIBS)
+${BUILD_ROOT}/kernel_utility: kernel_utility.cc $(LIBS)
         $(CXX) $(CFLAGS) $(INCLUDES) -ggdb -D__STDC_LIMIT_MACROS $< \
         -o $@ $(LIBS) -lcrypto
 
-signature_digest_utility: signature_digest_utility.c $(LIBS)
+${BUILD_ROOT}/signature_digest_utility: signature_digest_utility.c $(LIBS)
         $(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(LIBS) -lcrypto
 
-vbutil_kernel: vbutil_kernel.c $(LIBS)
+${BUILD_ROOT}/vbutil_kernel: vbutil_kernel.c $(LIBS)
         $(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(LIBS) -lcrypto
 
-vbutil_key: vbutil_key.c $(LIBS)
+${BUILD_ROOT}/vbutil_key: vbutil_key.c $(LIBS)
         $(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(LIBS) -lcrypto
 
-vbutil_keyblock: vbutil_keyblock.c $(LIBS)
+${BUILD_ROOT}/vbutil_keyblock: vbutil_keyblock.c $(LIBS)
         $(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(LIBS) -lcrypto
 
-verify_data: verify_data.c $(LIBS)
+${BUILD_ROOT}/verify_data: verify_data.c $(LIBS)
         $(CC) $(CFLAGS) $(INCLUDES) $< -o $@ $(LIBS) -lcrypto
 
-clean:
-        rm -f $(TARGET_BINS)
 
 install: $(TARGET_BINS)
         mkdir -p $(DESTDIR)
         cp -f $(TARGET_BINS) $(DESTDIR)
-        chmod a+rx $(patsubst %,$(DESTDIR)/%,$(TARGET_BINS))
+        chmod a+rx $(patsubst %,$(DESTDIR)/%,$(TARGET_NAMES))
 
-%o : %c
-        $(CC) $(CFLAGS) $(INCLUDES) -c -o $@ $<
+-include ALL_DEPS