make 编译系统--变量分析记录

TARGET_FWK_SUPPORTS_FULL_VALUEADDS := true

build/make/core/config.mk

TARGET_FWK_SUPPORTS_FULL_VALUEADDS := true

最终导致：

ifeq ($(TARGET_FWK_SUPPORTS_FULL_VALUEADDS), true)
  ADDITIONAL_SYSTEM_PROPERTIES += \
        ro.vendor.qti.va_aosp.support=1

  ADDITIONAL_ODM_PROPERTIES += \
        ro.vendor.qti.va_odm.support=1

  $(warning "Compile using modified AOSP tree supporting full vendor value-adds")
else
  ADDITIONAL_SYSTEM_PROPERTIES += \
        ro.vendor.qti.va_aosp.support=0

  ADDITIONAL_ODM_PROPERTIES += \
        ro.vendor.qti.va_odm.support=0

  $(warning "Compile using pure AOSP tree")
endif