Automated version generation for vboot firmware.

firmware/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.
 
 FWTOP := $(shell pwd)
 LIBDIR = $(FWTOP)/lib
 STUBDIR = $(FWTOP)/stub
 TESTDIR = $(FWTOP)/linktest
 BUILD_ROOT := ${BUILD}/$(shell basename ${FWTOP})
 
@@ skipping 21 matching lines @@
         ./lib/vboot_common.c \
         ./lib/vboot_firmware.c \
         ./lib/vboot_kernel.c
 
 STUB_SRCS = \
         ./stub/boot_device_stub.c \
         ./stub/load_firmware_stub.c \
         ./stub/tlcl.c \
         ./stub/utility_stub.c
 
-ALL_SRCS = ${LIB_SRCS} ${STUB_SRCS}
+ALL_SRCS = ${LIB_SRCS} ${STUB_SRCS} version.c
 
-test : $(FWLIB)
+test : $(FWLIB) update-version
         $(CC) $(CFLAGS) $(INCLUDES) -o $(BUILD_ROOT)/a.out \
                 $(TESTDIR)/main.c $(FWLIB)
 
+# This is executed at every make, to see if anything has changed
+update-version :
+        find \( -name '*.[ch]' -o -name 'Makefile*' \) -a \! -name version.c \
+                | sort | xargs cat | md5sum | cut -c 25-32 > x.tmp
+        echo "char* VbootVersion = \"VBOOv=$$(cat x.tmp)\";" > version.tmp
+        cmp -s version.tmp version.c || \
+                ( echo "** Updating version.c **" && \
+                  cp version.tmp version.c )
+
+
 include ../common.mk
 
 $(FWLIB) : $(ALL_OBJS)
         rm -f $@
         ar qc $@ $^