buildroot

################################################################################

#

# linux-backports

#

################################################################################

​

LINUX_BACKPORTS_VERSION_MAJOR = 4.4.2

LINUX_BACKPORTS_VERSION = $(LINUX_BACKPORTS_VERSION_MAJOR)-1

LINUX_BACKPORTS_SOURCE = backports-$(LINUX_BACKPORTS_VERSION).tar.xz

LINUX_BACKPORTS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/projects/backports/stable/v$(LINUX_BACKPORTS_VERSION_MAJOR)

LINUX_BACKPORTS_LICENSE = GPL-2.0

LINUX_BACKPORTS_LICENSE_FILES = COPYING

​

ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_DEFCONFIG),y)

LINUX_BACKPORTS_KCONFIG_FILE = $(LINUX_BACKPORTS_DIR)/defconfigs/$(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG))

else ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_CUSTOM_CONFIG),y)

LINUX_BACKPORTS_KCONFIG_FILE = $(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE))

endif

​

LINUX_BACKPORTS_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CONFIG_FRAGMENT_FILES))

LINUX_BACKPORTS_KCONFIG_OPTS = $(LINUX_BACKPORTS_MAKE_OPTS)

​

# linux-backports' build system expects the config options to be present

# in the environment, and it is so when using their custom buildsystem,

# because they are set in the main Makefile, which then calls a second

# Makefile.

#

# In our case, we do not use that first Makefile. So, we parse the

# .config file, filter-out comment lines and put the rest as command

# line variables.

#

# LINUX_BACKPORTS_MAKE_OPTS is used by the kconfig-package infra, while

# LINUX_BACKPORTS_MODULE_MAKE_OPTS is used by the kernel-module infra.

#

LINUX_BACKPORTS_MAKE_OPTS = \

    BACKPORT_DIR=$(@D) \

    KLIB_BUILD=$(LINUX_DIR) \

    KLIB=$(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED) \

    INSTALL_MOD_DIR=backports \

    `sed -r -e '/^\#/d;' $(@D)/.config`

​

LINUX_BACKPORTS_MODULE_MAKE_OPTS = $(LINUX_BACKPORTS_MAKE_OPTS)

​

# This file is not automatically generated by 'oldconfig' that we use in

# the kconfig-package infrastructure. In the linux buildsystem, it is

# generated by running silentoldconfig, but that's not the case for

# linux-backports: it uses a hand-crafted rule to generate that file.

define LINUX_BACKPORTS_KCONFIG_FIXUP_CMDS

    $(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(LINUX_BACKPORTS_MAKE_OPTS) backport-include/backport/autoconf.h

endef

​

# Checks to give errors that the user can understand

ifeq ($(BR_BUILDING),y)

​

ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_DEFCONFIG),y)

ifeq ($(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG)),)

$(error No linux-backports defconfig name specified, check your BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG setting)

endif

endif

​

ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_CUSTOM_CONFIG),y)

ifeq ($(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE)),)

$(error No linux-backports configuration file specified, check your BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE setting)

endif

endif

​

endif # BR_BUILDING

​

$(eval $(kernel-module))

$(eval $(kconfig-package))

​

# linux-backports' own .config file needs options from the kernel's own

# .config file. The dependencies handling in the infrastructure does not

# allow to express this kind of dependencies. Besides, linux.mk might

# not have been parsed yet, so the Linux build dir LINUX_DIR is not yet

# known. Thus, we use a "secondary expansion" so the rule is re-evaluated

# after all Makefiles are parsed, and thus at that time we will have the

# LINUX_DIR variable set to the proper value.

#

# Furthermore, we want to check the kernel version, since linux-backports

# only supports kernels >= 3.0. To avoid overriding linux-backports'

# .config rule defined in the kconfig-package infra, we use an

# intermediate stamp-file.

#

# Finally, it must also come after the call to kconfig-package, so we get

# LINUX_BACKPORTS_DIR properly defined (because the target part of the

# rule is not re-evaluated).

#

$(LINUX_BACKPORTS_DIR)/.config: $(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version

​

.SECONDEXPANSION:

$(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version: $$(LINUX_DIR)/.config