core: Fix build_{date,number}

Change-Id: I81e6cb0e5e191f669bb665207d71f28f3fa19581

diff --git a/core/main.mk b/core/main.mk
index b9137bc..9015006 100644 (file)
--- a/core/main.mk
+++ b/core/main.mk
@@ -122,8 +122,8 @@ endif
 $(shell mkdir -p $(OUT_DIR) && \
     echo -n $(BUILD_NUMBER) > $(OUT_DIR)/build_number.txt && \
     echo -n $(BUILD_DATETIME) > $(OUT_DIR)/build_date.txt)
-BUILD_NUMBER_FROM_FILE := $(cat $(OUT_DIR)/build_number.txt)
-BUILD_DATETIME_FROM_FILE := $(cat $(OUT_DIR)/build_date.txt)
+BUILD_NUMBER_FROM_FILE := $(shell cat $(OUT_DIR)/build_number.txt)
+BUILD_DATETIME_FROM_FILE := $(shell cat $(OUT_DIR)/build_date.txt)
 ifeq ($(HOST_OS),darwin)
 DATE_FROM_FILE := date -r $(BUILD_DATETIME_FROM_FILE)
 else