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authorJonas Gorski <jonas.gorski@gmail.com>2016-08-13 11:29:46 +0200
committerJonas Gorski <jonas.gorski@gmail.com>2016-08-13 11:35:00 +0200
commit5fe923b15d94e27fa6db863a6d994bfb4355e4cb (patch)
tree63d7bcf06fa82ecfcb3e88ba4d56b1eed53d1526
parent4e8c6f340751c66a602b98b727af28b2a9004313 (diff)
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kernel: allow reproducable builds
Similar how we fix the file times in the filesystems, fix the build time of the kernel, and make the build number static. This should allow the kernel build to be reproducable when combined with setting the KERNEL_BUILD_USER and _DOMAIN in case of different machines. The reproducability only applies to non-initramfs kernels, those still require additional changes. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
-rw-r--r--include/kernel-defaults.mk2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk
index 11dff75..534699b 100644
--- a/include/kernel-defaults.mk
+++ b/include/kernel-defaults.mk
@@ -12,6 +12,8 @@ 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="@$(SOURCE_DATE_EPOCH)")" \
+ KBUILD_BUILD_VERSION="0" \
CONFIG_SHELL="$(BASH)" \
$(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
$(if $(PKG_BUILD_ID),LDFLAGS_MODULE=--build-id=0x$(PKG_BUILD_ID))