android编译分析之6—device.mk-优快云博客

本文介绍了Makefile中设备配置的实现方式，包括设备变量定义、设备继承、设备导入等关键步骤。通过具体实例展示了如何解析简短的设备名称并映射到完整的设备配置。

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首先定义了几个device相关的变量，

_device_var_list := \
    DEVICE_NAME \
    DEVICE_BOARD \
    DEVICE_REGION

device和product类似，也有很多的DEVICES，不同的device v通过DEVICES..v进行区分，其中为makefile的全路径。

define dump-device
$(info ==== $(1) ====)\
$(foreach v,$(_device_var_list),\
$(info DEVICES.$(1).$(v) := $(DEVICES.$(1).$(v))))\
$(info --------)
endef

define dump-devices
$(foreach p,$(DEVICES),$(call dump-device,$(p)))
endef

device的继承，

#
# $(1): device to inherit
#
define inherit-device
  $(foreach v,$(_device_var_list), \
      $(eval $(v) := $($(v)) $(INHERIT_TAG)$(strip $(1))))
endef

依然是调用import-nodes，但是第一个参数为DEVICES，不详细分析了。

#
# $(1): device makefile list
#
#TODO: check to make sure that devices have all the necessary vars defined
define import-devices
$(call import-nodes,DEVICES,$(1),$(_device_var_list))
endef

#
# $(1): short device name like "sooner"
#
define _resolve-short-device-name
  $(eval dn := $(strip $(1)))
  $(eval d := \
      $(foreach d,$(DEVICES), \
          $(if $(filter $(dn),$(DEVICES.$(d).DEVICE_NAME)), \
            $(d) \
       )) \
   )
  $(eval d := $(sort $(d)))
  $(if $(filter 1,$(words $(d))), \
    $(d), \
    $(if $(filter 0,$(words $(d))), \
      $(error No matches for device "$(dn)"), \
      $(error Device "$(dn)" ambiguous: matches $(d)) \
    ) \
  )
endef

#
# $(1): short device name like "sooner"
#
define resolve-short-device-name
$(strip $(call _resolve-short-device-name,$(1)))
endef