kernel: check SOURCE_DATE_EPOCH before setting KBUILD_BUILD_TIMESTAMP

Make sure SOURCE_DATE_EPOCH actually contains something.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk
index 534699b79ccc55fe48f29bdfa9cbc06e3a7723db..53e733adc0c24cd32f25b21d602565188f8545d2 100644 (file)
--- a/include/kernel-defaults.mk
+++ b/include/kernel-defaults.mk
@@ -12,7 +12,7 @@ KERNEL_MAKEOPTS := -C $(LINUX_DIR) \
        KBUILD_HAVE_NLS=no \
        KBUILD_BUILD_USER="$(call qstrip,$(CONFIG_KERNEL_BUILD_USER))" \
        KBUILD_BUILD_HOST="$(call qstrip,$(CONFIG_KERNEL_BUILD_DOMAIN))" \
-       KBUILD_BUILD_TIMESTAMP="$(shell date -u --date="@$(SOURCE_DATE_EPOCH)")" \
+       $(if $(SOURCE_DATE_EPOCH),KBUILD_BUILD_TIMESTAMP="$(shell date -u --date="@$(SOURCE_DATE_EPOCH)")") \
        KBUILD_BUILD_VERSION="0" \
        CONFIG_SHELL="$(BASH)" \
        $(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \