package/linux-backports/linux-backports.mk

   1 ################################################################################
   2 #
   3 # linux-backports
   4 #
   5 ################################################################################
   6
   7 LINUX_BACKPORTS_VERSION_MAJOR = 4.4.2
   8 LINUX_BACKPORTS_VERSION = $(LINUX_BACKPORTS_VERSION_MAJOR)-1
   9 LINUX_BACKPORTS_SOURCE = backports-$(LINUX_BACKPORTS_VERSION).tar.xz
  10 LINUX_BACKPORTS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/projects/backports/stable/v$(LINUX_BACKPORTS_VERSION_MAJOR)
  11 LINUX_BACKPORTS_LICENSE = GPLv2
  12 LINUX_BACKPORTS_LICENSE_FILES = COPYING
  13
  14 ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_DEFCONFIG),y)
  15 LINUX_BACKPORTS_KCONFIG_FILE = $(LINUX_BACKPORTS_DIR)/defconfigs/$(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG))
  16 else ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_CUSTOM_CONFIG),y)
  17 LINUX_BACKPORTS_KCONFIG_FILE = $(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE))
  18 endif
  19
  20 LINUX_BACKPORTS_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CONFIG_FRAGMENT_FILES))
  21 LINUX_BACKPORTS_KCONFIG_OPTS = $(LINUX_BACKPORTS_MAKE_OPTS)
  22
  23 # linux-backports' build system expects the config options to be present
  24 # in the environment, and it is so when using their custom buildsystem,
  25 # because they are set in the main Makefile, which then calls a second
  26 # Makefile.
  27 #
  28 # In our case, we do not use that first Makefile. So, we parse the
  29 # .config file, filter-out comment lines and put the rest as command
  30 # line variables.
  31 #
  32 # LINUX_BACKPORTS_MAKE_OPTS is used by the kconfig-package infra, while
  33 # LINUX_BACKPORTS_MODULE_MAKE_OPTS is used by the kernel-module infra.
  34 #
  35 LINUX_BACKPORTS_MAKE_OPTS = \
  36         BACKPORT_DIR=$(@D) \
  37         KLIB_BUILD=$(LINUX_DIR) \
  38         KLIB=$(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED) \
  39         INSTALL_MOD_DIR=backports \
  40         `sed -r -e '/^\#/d;' $(@D)/.config`
  41
  42 LINUX_BACKPORTS_MODULE_MAKE_OPTS = $(LINUX_BACKPORTS_MAKE_OPTS)
  43
  44 # This file is not automatically generated by 'oldconfig' that we use in
  45 # the kconfig-package infrastructure. In the linux buildsystem, it is
  46 # generated by running silentoldconfig, but that's not the case for
  47 # linux-backports: it uses a hand-crafted rule to generate that file.
  48 define LINUX_BACKPORTS_KCONFIG_FIXUP_CMDS
  49         $(MAKE) -C $(@D) $(LINUX_BACKPORTS_MAKE_OPTS) backport-include/backport/autoconf.h
  50 endef
  51
  52 # Checks to give errors that the user can understand
  53 ifeq ($(BR_BUILDING),y)
  54
  55 ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_DEFCONFIG),y)
  56 ifeq ($(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG)),)
  57 $(error No linux-backports defconfig name specified, check your BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG setting)
  58 endif
  59 endif
  60
  61 ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_CUSTOM_CONFIG),y)
  62 ifeq ($(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE)),)
  63 $(error No linux-backports configuration file specified, check your BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE setting)
  64 endif
  65 endif
  66
  67 endif # BR_BUILDING
  68
  69 $(eval $(kernel-module))
  70 $(eval $(kconfig-package))
  71
  72 # linux-backports' own .config file needs options from the kernel's own
  73 # .config file. The dependencies handling in the infrastructure does not
  74 # allow to express this kind of dependencies. Besides, linux.mk might
  75 # not have been parsed yet, so the Linux build dir LINUX_DIR is not yet
  76 # known. Thus, we use a "secondary expansion" so the rule is re-evaluated
  77 # after all Makefiles are parsed, and thus at that time we will have the
  78 # LINUX_DIR variable set to the proper value.
  79 #
  80 # Furthermore, we want to check the kernel version, since linux-backports
  81 # only supports kernels >= 3.0. To avoid overriding linux-backports'
  82 # .config rule defined in the kconfig-package infra, we use an
  83 # intermediate stamp-file.
  84 #
  85 # Finally, it must also come after the call to kconfig-package, so we get
  86 # LINUX_BACKPORTS_DIR properly defined (because the target part of the
  87 # rule is not re-evaluated).
  88 #
  89 $(LINUX_BACKPORTS_DIR)/.config: $(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version
  90
  91 .SECONDEXPANSION:
  92 $(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version: $$(LINUX_DIR)/.config
  93         $(Q)LINUX_VERSION_PROBED=$(LINUX_VERSION_PROBED); \
  94         if [ $${LINUX_VERSION_PROBED%%.*} -lt 3 ]; then \
  95                 printf "Linux version '%s' is too old for linux-backports (needs 3.0 or later)\n" \
  96                         "$${LINUX_VERSION_PROBED}"; \
  97                 exit 1; \
  98         fi
  99         $(Q)touch $(@)