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# 
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# Copyright (C) 2006-2014 OpenWrt.org
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# Copyright (C) 2016 LEDE Project
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#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
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include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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include $(INCLUDE_DIR)/version.mk
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include $(INCLUDE_DIR)/download.mk
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override MAKEFLAGS=

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SDK_NAME:=$(VERSION_DIST_SANITIZED)-sdk-$(if $(CONFIG_VERSION_FILENAMES),$(VERSION_NUMBER)-)$(BOARD)$(if $(SUBTARGET),-$(SUBTARGET))$(if $(GCCV),_gcc-$(GCCV))$(DIR_SUFFIX).$(HOST_OS)-$(HOST_ARCH)
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SDK_BUILD_DIR:=$(BUILD_DIR)/$(SDK_NAME)
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STAGING_SUBDIR_HOST := staging_dir/host
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STAGING_SUBDIR_TARGET := staging_dir/$(TARGET_DIR_NAME)
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STAGING_SUBDIR_TOOLCHAIN := staging_dir/toolchain-$(ARCH)$(ARCH_SUFFIX)_gcc-$(GCCV)_$(LIBC)$(if $(CONFIG_arm),_eabi)
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EXCLUDE_DIRS:=*/ccache/* \
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	*/stamp \
	*/stampfiles \
	*/man \
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	*/info \
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	*/root-* \
	initial \
	*.install.clean \
	*.install.flags \
	*.install \
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	*/doc \
	*/share/locale
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SDK_DIRS = \
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		$(STAGING_SUBDIR_HOST) \
		$(STAGING_SUBDIR_TOOLCHAIN)
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GIT_URL:=$(shell git config --get remote.origin.url 2>/dev/null)
GIT_URL:=$(if $(CONFIG_BUILDBOT),$(filter git://% http://% https://%,$(GIT_URL)),$(GIT_URL))
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GIT_COMMIT:=$(shell git rev-parse HEAD 2>/dev/null)
GIT_BRANCH:=$(filter-out master HEAD,$(shell git rev-parse --abbrev-ref HEAD 2>/dev/null))
GIT_TAGNAME:=$(shell git show-ref --tags --dereference 2>/dev/null | sed -ne '/^$(GIT_COMMIT) / { s|^.*/||; s|\^.*||; p }')
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BASE_FEED:=$(if $(GIT_URL),src-git base $(GIT_URL)$(if $(GIT_BRANCH),;$(GIT_BRANCH),$(if $(GIT_TAGNAME),;$(GIT_TAGNAME))))
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BASE_FEED:=$(if $(BASE_FEED),$(BASE_FEED),$(shell cd $(TOPDIR); LC_ALL=C git svn info 2>/dev/null | sed -ne 's/^URL: /src-gitsvn base /p'))
BASE_FEED:=$(if $(BASE_FEED),$(BASE_FEED),$(shell cd $(TOPDIR); LC_ALL=C svn info 2>/dev/null | sed -ne 's/^URL: /src-svn base /p'))
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BASE_FEED:=$(if $(BASE_FEED),$(BASE_FEED),src-git base $(PROJECT_GIT)/openwrt/openwrt.git$(if $(GIT_BRANCH),;$(GIT_BRANCH),$(if $(GIT_TAGNAME),;$(GIT_TAGNAME))))
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KDIR_BASE = $(patsubst $(TOPDIR)/%,%,$(LINUX_DIR))
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KDIR_ARCHES = $(LINUX_KARCH)

# arch/arm64/ includes reference files in arch/arm/, so we'll need both
ifeq ($(LINUX_KARCH),arm64)
  KDIR_ARCHES += arm
endif
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KERNEL_FILES_ARCH = \
	Makefile* \
	module.lds \
	Kbuild.platforms \
	*/Platform \
	include \
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	*/include \
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	scripts \
	kernel/asm-offsets.s

KERNEL_FILES_BASE := \
	.config \
	Makefile \
	scripts \
	include \
	Module.symvers \
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	modules.builtin \
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	$(foreach arch,$(KDIR_ARCHES),$(addprefix arch/$(arch)/,$(KERNEL_FILES_ARCH)))
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KERNEL_FILES := $(patsubst $(TOPDIR)/%,%,$(wildcard $(addprefix $(LINUX_DIR)/,$(KERNEL_FILES_BASE))))

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all: compile

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$(BIN_DIR)/$(SDK_NAME).tar.xz: clean
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	mkdir -p $(SDK_BUILD_DIR)/dl $(SDK_BUILD_DIR)/package
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	$(CP) -L $(INCLUDE_DIR) $(SCRIPT_DIR) $(SDK_BUILD_DIR)/
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	$(TAR) -cf - -C $(TOPDIR) \
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		`cd $(TOPDIR); find $(KDIR_BASE)/ -name \*.ko` \
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		`cd $(TOPDIR); find $(KDIR_BASE)/firmware/ -newer $(KDIR_BASE)/firmware/Makefile \
			-type f -name '*.bin' -or -name '*.cis' -or -name '*.csp' -or -name '*.dsp' -or -name '*.fw'` \
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		$(foreach exclude,$(EXCLUDE_DIRS),--exclude="$(exclude)") \
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		$(SDK_DIRS) $(KERNEL_FILES) | \
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		$(TAR) -xf - -C $(SDK_BUILD_DIR)
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	# Copy usbip sources, this is required for the usbip userspace packages to be buildable by the SDK.
	$(TAR) -cf - -C $(TOPDIR) $(KDIR_BASE)/tools/usb/usbip/ | \
		$(TAR) -xf - -C $(SDK_BUILD_DIR)

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	(cd $(SDK_BUILD_DIR); find $(STAGING_SUBDIR_HOST)/bin $(STAGING_SUBDIR_HOST)/usr/bin \
		$(STAGING_SUBDIR_TOOLCHAIN)/bin $(STAGING_SUBDIR_TOOLCHAIN)/*/bin $(STAGING_SUBDIR_TOOLCHAIN)/libexec \
		-type f | $(XARGS) $(SCRIPT_DIR)/bundle-libraries.sh $(SDK_BUILD_DIR)/$(STAGING_SUBDIR_HOST))

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	@-( \
		find \
			$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_HOST)/bin \
			$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_HOST)/usr/bin \
			$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_TOOLCHAIN)/bin \
			$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_TOOLCHAIN)/*/bin \
			$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_TOOLCHAIN)/libexec \
			-type f; \
		find \
			$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_HOST)/lib \
			$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_HOST)/usr/lib \
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			-type f -name \*.so\*; \
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	) | xargs strip 2>/dev/null >/dev/null

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	mkdir -p $(SDK_BUILD_DIR)/target/linux
	$(CP) $(GENERIC_PLATFORM_DIR) $(PLATFORM_DIR) $(SDK_BUILD_DIR)/target/linux/
	rm -rf \
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		$(SDK_BUILD_DIR)/target/linux/*/files* \
		$(SDK_BUILD_DIR)/target/linux/*/patches*
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	./convert-config.pl $(TOPDIR)/.config > $(SDK_BUILD_DIR)/Config-build.in
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	$(CP) -L \
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		$(TOPDIR)/LICENSE \
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		$(TOPDIR)/rules.mk \
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		./files/Config.in \
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		./files/Makefile \
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		./files/include/prepare.mk \
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		./files/README.SDK \
		$(SDK_BUILD_DIR)/
	$(CP) \
		$(TOPDIR)/package/Makefile \
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		$(TOPDIR)/package/libs/toolchain \
		$(TOPDIR)/package/kernel/linux \
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		$(SDK_BUILD_DIR)/package/
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	-rm -rf \
		$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_HOST)/ccache \
		$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_TARGET)/ccache \
		$(SDK_BUILD_DIR)/$(STAGING_SUBDIR_TOOLCHAIN)/ccache

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	-rm -f $(SDK_BUILD_DIR)/feeds.conf.default
	$(if $(BASE_FEED),echo "$(BASE_FEED)" > $(SDK_BUILD_DIR)/feeds.conf.default)
	if [ -f $(TOPDIR)/feeds.conf ]; then \
		cat $(TOPDIR)/feeds.conf >> $(SDK_BUILD_DIR)/feeds.conf.default; \
	else \
		cat $(TOPDIR)/feeds.conf.default >> $(SDK_BUILD_DIR)/feeds.conf.default; \
	fi
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	$(SED) 's,^# REVISION:=.*,REVISION:=$(REVISION),g' $(SDK_BUILD_DIR)/include/version.mk
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	$(SED) 's,^# SOURCE_DATE_EPOCH:=.*,SOURCE_DATE_EPOCH:=$(SOURCE_DATE_EPOCH),g' $(SDK_BUILD_DIR)/include/version.mk
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	$(SED) '/LINUX_VERMAGIC:=/ { s,unknown,$(LINUX_VERMAGIC),g }' $(SDK_BUILD_DIR)/include/kernel.mk
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	find $(SDK_BUILD_DIR) -name .git | $(XARGS) rm -rf
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	find $(SDK_BUILD_DIR) -name .svn | $(XARGS) rm -rf
	find $(SDK_BUILD_DIR) -name CVS | $(XARGS) rm -rf
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	-make -C $(SDK_BUILD_DIR)/scripts/config clean
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	(cd $(BUILD_DIR); \
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		tar -I 'xz -7e' -cf $@ $(SDK_NAME); \
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	)

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download:
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prepare:
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compile: $(BIN_DIR)/$(SDK_NAME).tar.xz
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install: compile
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clean:
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	rm -rf $(SDK_BUILD_DIR) $(BIN_DIR)/$(SDK_NAME).tar.xz