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boot/barebox: pass required environment variables for reproducible build

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Barebox makes use of the same variables as the linux kernel does for
handling reproducible build -- KBUILD_BUILD_HOST,
KBUILD_BUILD_TIMESTAMP, KBUILD_BUILD_USER. This patch sets the proper
variables based on linux/linux.mk, and passes them to the make
invocation when building, to ensure a reproducible build is possible
when BR2_REPRODUCIBLE is enabled.

Signed-off-by: Casey Reeves <casey@xogium.me>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Casey Reeves 2023-01-19 13:10:04 +01:00 committed by Thomas Petazzoni
parent bfef88762d
commit c90bd74ebb
1 changed files with 8 additions and 1 deletions
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9
boot/barebox/barebox.mk
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@ -74,6 +74,13 @@ endif
$(1)_MAKE_FLAGS = ARCH=$$($(1)_ARCH) CROSS_COMPILE="$$(TARGET_CROSS)"
$(1)_MAKE_ENV = $$(TARGET_MAKE_ENV)
ifeq ($(BR2_REPRODUCIBLE),y)
$(1)_MAKE_ENV += \
KBUILD_BUILD_USER=buildroot \
KBUILD_BUILD_HOST=buildroot \
KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
endif
ifeq ($$(BR2_TARGET_$(1)_USE_DEFCONFIG),y)
$(1)_KCONFIG_DEFCONFIG = $$(call qstrip,$$(BR2_TARGET_$(1)_BOARD_DEFCONFIG))_defconfig
else ifeq ($$(BR2_TARGET_$(1)_USE_CUSTOM_CONFIG),y)
@ -121,7 +128,7 @@ endef
define $(1)_BUILD_CMDS
$$($(1)_BUILD_BAREBOXENV_CMDS)
$$(TARGET_MAKE_ENV) $$(MAKE) $$($(1)_MAKE_FLAGS) -C $$(@D)
$$($(1)_MAKE_ENV) $$(MAKE) $$($(1)_MAKE_FLAGS) -C $$(@D)
$$($(1)_BUILD_CUSTOM_ENV)
endef