New targets to compile and install rollback tests only with USE=rbtest emerge ...

Review URL: http://codereview.chromium.org/2962002
diff --git a/Makefile b/Makefile
index 638d512..8d78466 100644
--- a/Makefile
+++ b/Makefile
@@ -35,7 +35,9 @@
 install:
 	$(MAKE) -C utility install
 	$(MAKE) -C cgpt install
-	$(MAKE) -C tests install
 
 runtests:
 	$(MAKE) -C tests runtests
+
+rbtest:
+	$(MAKE) -C tests rbtest
diff --git a/tests/Makefile b/tests/Makefile
index 957e9bb..e474dbb 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -32,9 +32,9 @@
 EXTRA_TARGET = runtests
 endif
 
-# Disable rollback_index_test by default because it requires the real
-# tlcl lib
-all: $(TEST_BINS) ${EXTRA_TARGET} # $(BUILD_ROOT)/rollback_index_test
+all: $(TEST_BINS) ${EXTRA_TARGET}
+
+rbtest: $(BUILD_ROOT)/rollback_index_test
 
 ${TEST_LIB}: ${TEST_LIB_OBJS}
 	rm -f $@
@@ -101,11 +101,8 @@
 #	${BUILD_ROOT}/firmware_rollback_tests
 #	${BUILD_ROOT}/kernel_rollback_tests
 
-# Must have a dummy install target for ebuild
-install:
-
-#install: $(BUILD_ROOT)/rollback_index_test
-#	mkdir -p $(DESTDIR)
-#	cp -f $(BUILD_ROOT)/rollback_index_test $(DESTDIR)
+install-rbtest: $(BUILD_ROOT)/rollback_index_test
+	mkdir -p $(DESTDIR)
+	cp -f $(BUILD_ROOT)/rollback_index_test $(DESTDIR)
 
 -include ${ALL_DEPS}