build: use perl instead of GNU date for KBUILD_BUILD_TIMESTAMP
Fixes warning on non-Linux systems Signed-off-by: Felix Fietkau <nbd@nbd.name>
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1 changed files with 7 additions and 1 deletions
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@ -5,6 +5,12 @@
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# See /LICENSE for more information.
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#
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ifneq ($(SOURCE_DATE_EPOCH),)
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ifndef DUMP
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KBUILD_BUILD_TIMESTAMP:=$(shell perl -e 'print scalar gmtime($(SOURCE_DATE_EPOCH))')
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endif
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endif
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KERNEL_MAKEOPTS := -C $(LINUX_DIR) \
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HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
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CROSS_COMPILE="$(KERNEL_CROSS)" \
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@ -12,7 +18,7 @@ KERNEL_MAKEOPTS := -C $(LINUX_DIR) \
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KBUILD_HAVE_NLS=no \
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KBUILD_BUILD_USER="$(call qstrip,$(CONFIG_KERNEL_BUILD_USER))" \
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KBUILD_BUILD_HOST="$(call qstrip,$(CONFIG_KERNEL_BUILD_DOMAIN))" \
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$(if $(SOURCE_DATE_EPOCH),KBUILD_BUILD_TIMESTAMP="$(shell date -u --date="@$(SOURCE_DATE_EPOCH)")") \
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KBUILD_BUILD_TIMESTAMP="$(KBUILD_BUILD_TIMESTAMP)" \
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KBUILD_BUILD_VERSION="0" \
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CONFIG_SHELL="$(BASH)" \
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$(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
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