Rework the vboot_reference make system.

After this change the generated files are placed in a
separate tree (such thet they don't show in the
`git status' output anymore) and the dependencies are
followed properly (if a .h file changes the
appropriate .o files and apps get rebuilt).

Tested as follows:

> $ make clean
> $ make # build succeeds
> $ git status # shows clean directory
> $ RUNTESTS=1 make # (captured test output matches that of the test run before any changes)
> $ touch ./vboot_firmware/include/tlcl.h
> $ make  # make succeeds
> $ find build -type f -newer ./vboot_firmware/include/tlcl.h
build/vboot_firmware/lib/rollback_index.o
build/vboot_firmware/lib/rollback_index.o.d
build/vboot_firmware/a.out
build/vboot_fw.a
build/utility/vbutil_key
build/utility/kernel_utility.d
build/utility/vbutil_key.d
build/utility/verify_data
build/utility/load_kernel_test.d
build/utility/vbutil_keyblock.d
build/utility/vbutil_kernel
build/utility/vbutil_kernel.d
build/utility/firmware_utility
build/utility/signature_digest_utility.d
build/utility/kernel_utility
build/utility/verify_data.d
build/utility/vbutil_keyblock
build/utility/signature_digest_utility
build/utility/load_kernel_test
build/utility/firmware_utility.d
build/tests/vboot_common3_tests
build/tests/vboot_common2_tests
build/host/a.out
$ >

Review URL: http://codereview.chromium.org/2845001

1 files changed, 12 insertions, 7 deletions

diff --git a/Makefile b/Makefile
index 853bfbfa..4022dafd 100644
--- a/Makefile
+++ b/Makefile
@@ -12,22 +12,27 @@ export INCLUDES = \
 	-I$(FWDIR)/include \
 	-I$(TOP)/misclibs/include
 
-export FWLIB=$(FWDIR)/vboot_fw.a
-export HOSTLIB=$(HOSTDIR)/vboot_host.a
+export BUILD = ${TOP}/build
+export FWLIB = ${BUILD}/vboot_fw.a
+export HOSTLIB= ${BUILD}/vboot_host.a
 
-SUBDIRS=vboot_firmware misclibs host vfirmware vkernel utility cgpt tests
+SUBDIRS = vboot_firmware misclibs host vfirmware vkernel utility cgpt tests
 
 all:
 	set -e; \
+	for d in $(shell find ${SUBDIRS} -name '*.c' -exec  dirname {} \; |\
+		 sort -u); do \
+		newdir=${BUILD}/$$d; \
+		if [ ! -d $$newdir ]; then \
+			mkdir -p $$newdir; \
+		fi; \
+	done && \
 	for i in $(SUBDIRS); do \
 		make -C $$i; \
 	done
 
 clean:
-	set -e; \
-	for i in $(SUBDIRS); do \
-		make -C $$i clean; \
-	done
+	/bin/rm -rf ${BUILD}
 
 install:
 	$(MAKE) -C utility install