Android定义的路径全局变量

对Android定义的路径全局变量，可以查看如下代码：
                    ifeq(,$(strip$(OUT_DIR)))
            OUT_DIR:=$(TOPDIR)out
            endif
            
            DEBUG_OUT_DIR:=$(OUT_DIR)/debug
            
            #Movethehostortargetunderthedebug/directory
            #ifnecessary.
            TARGET_OUT_ROOT_release:=$(OUT_DIR)/target
            TARGET_OUT_ROOT_debug:=$(DEBUG_OUT_DIR)/target
            TARGET_OUT_ROOT:=$(TARGET_OUT_ROOT_$(TARGET_BUILD_TYPE))
            
            HOST_OUT_ROOT_release:=$(OUT_DIR)/host
            HOST_OUT_ROOT_debug:=$(DEBUG_OUT_DIR)/host
            HOST_OUT_ROOT:=$(HOST_OUT_ROOT_$(HOST_BUILD_TYPE))
            
            HOST_OUT_release:=$(HOST_OUT_ROOT_release)/$(HOST_OS)-$(HOST_ARCH)
            HOST_OUT_debug:=$(HOST_OUT_ROOT_debug)/$(HOST_OS)-$(HOST_ARCH)
            HOST_OUT:=$(HOST_OUT_$(HOST_BUILD_TYPE))
            
            ifeq($(TARGET_SIMULATOR),true)
            #Anyarch-oros-specificpartsofthesimulator(everything
            #underproduct/)areactuallyhost-dependent.
            #But,thedebugtypeiscontrolledbyTARGET_BUILD_TYPEandnot
            #HOST_BUILD_TYPE.
            TARGET_PRODUCT_OUT_ROOT:=$(HOST_OUT_$(TARGET_BUILD_TYPE))/product
            else
            TARGET_PRODUCT_OUT_ROOT:=$(TARGET_OUT_ROOT)/product
            endif
            
            TARGET_COMMON_OUT_ROOT:=$(TARGET_OUT_ROOT)/common
            HOST_COMMON_OUT_ROOT:=$(HOST_OUT_ROOT)/common
            
            PRODUCT_OUT:=$(TARGET_PRODUCT_OUT_ROOT)/$(TARGET_DEVICE)
            
            OUT_DOCS:=$(TARGET_COMMON_OUT_ROOT)/docs
            
            HOST_OUT_EXECUTABLES:=$(HOST_OUT)/bin
            HOST_OUT_SHARED_LIBRARIES:=$(HOST_OUT)/lib
            HOST_OUT_JAVA_LIBRARIES:=$(HOST_OUT)/framework
            HOST_OUT_SDK_ADDON:=$(HOST_OUT)/sdk_addon
            
            HOST_OUT_INTERMEDIATES:=$(HOST_OUT)/obj
            HOST_OUT_HEADERS:=$(HOST_OUT_INTERMEDIATES)/include
            HOST_OUT_INTERMEDIATE_LIBRARIES:=$(HOST_OUT_INTERMEDIATES)/lib
            HOST_OUT_STATIC_LIBRARIES:=$(HOST_OUT_INTERMEDIATE_LIBRARIES)
            HOST_OUT_NOTICE_FILES:=$(HOST_OUT_INTERMEDIATES)/NOTICE_FILES
            HOST_OUT_COMMON_INTERMEDIATES:=$(HOST_COMMON_OUT_ROOT)/obj
            
            TARGET_OUT_INTERMEDIATES:=$(PRODUCT_OUT)/obj
            TARGET_OUT_HEADERS:=$(TARGET_OUT_INTERMEDIATES)/include
            TARGET_OUT_INTERMEDIATE_LIBRARIES:=$(TARGET_OUT_INTERMEDIATES)/lib
            TARGET_OUT_COMMON_INTERMEDIATES:=$(TARGET_COMMON_OUT_ROOT)/obj
            
            TARGET_OUT:=$(PRODUCT_OUT)/system
            TARGET_OUT_EXECUTABLES:=$(TARGET_OUT)/bin
            TARGET_OUT_OPTIONAL_EXECUTABLES:=$(TARGET_OUT)/xbin
            TARGET_OUT_SHARED_LIBRARIES:=$(TARGET_OUT)/lib
            TARGET_OUT_JAVA_LIBRARIES:=$(TARGET_OUT)/framework
            TARGET_OUT_APPS:=$(TARGET_OUT)/app
            TARGET_OUT_KEYLAYOUT:=$(TARGET_OUT)/usr/keylayout
            TARGET_OUT_KEYCHARS:=$(TARGET_OUT)/usr/keychars
            TARGET_OUT_ETC:=$(TARGET_OUT)/etc
            TARGET_OUT_STATIC_LIBRARIES:=$(TARGET_OUT_INTERMEDIATES)/lib
            TARGET_OUT_NOTICE_FILES:=$(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES
            
            TARGET_OUT_DATA:=$(PRODUCT_OUT)/data
            TARGET_OUT_DATA_EXECUTABLES:=$(TARGET_OUT_EXECUTABLES)
            TARGET_OUT_DATA_SHARED_LIBRARIES:=$(TARGET_OUT_SHARED_LIBRARIES)
            TARGET_OUT_DATA_JAVA_LIBRARIES:=$(TARGET_OUT_JAVA_LIBRARIES)
            TARGET_OUT_DATA_APPS:=$(TARGET_OUT_DATA)/app
            TARGET_OUT_DATA_KEYLAYOUT:=$(TARGET_OUT_KEYLAYOUT)
            TARGET_OUT_DATA_KEYCHARS:=$(TARGET_OUT_KEYCHARS)
            TARGET_OUT_DATA_ETC:=$(TARGET_OUT_ETC)
            TARGET_OUT_DATA_STATIC_LIBRARIES:=$(TARGET_OUT_STATIC_LIBRARIES)
            
            TARGET_OUT_UNSTRIPPED:=$(PRODUCT_OUT)/symbols
            TARGET_OUT_EXECUTABLES_UNSTRIPPED:=$(TARGET_OUT_UNSTRIPPED)/system/bin
            TARGET_OUT_SHARED_LIBRARIES_UNSTRIPPED:=$(TARGET_OUT_UNSTRIPPED)/system/lib
            TARGET_ROOT_OUT_UNSTRIPPED:=$(TARGET_OUT_UNSTRIPPED)
            TARGET_ROOT_OUT_SBIN_UNSTRIPPED:=$(TARGET_OUT_UNSTRIPPED)/sbin
            TARGET_ROOT_OUT_BIN_UNSTRIPPED:=$(TARGET_OUT_UNSTRIPPED)/bin
            
            TARGET_ROOT_OUT:=$(PRODUCT_OUT)/root
            TARGET_ROOT_OUT_BIN:=$(TARGET_ROOT_OUT)/bin
            TARGET_ROOT_OUT_SBIN:=$(TARGET_ROOT_OUT)/sbin
            TARGET_ROOT_OUT_ETC:=$(TARGET_ROOT_OUT)/etc
            TARGET_ROOT_OUT_USR:=$(TARGET_ROOT_OUT)/usr
            
            TARGET_RECOVERY_OUT:=$(PRODUCT_OUT)/recovery
            TARGET_RECOVERY_ROOT_OUT:=$(TARGET_RECOVERY_OUT)/root
            
            TARGET_SYSLOADER_OUT:=$(PRODUCT_OUT)/sysloader
            TARGET_SYSLOADER_ROOT_OUT:=$(TARGET_SYSLOADER_OUT)/root
            TARGET_SYSLOADER_SYSTEM_OUT:=$(TARGET_SYSLOADER_OUT)/root/system
            
            TARGET_INSTALLER_OUT:=$(PRODUCT_OUT)/installer
            TARGET_INSTALLER_DATA_OUT:=$(TARGET_INSTALLER_OUT)/data
            TARGET_INSTALLER_ROOT_OUT:=$(TARGET_INSTALLER_OUT)/root
            TARGET_INSTALLER_SYSTEM_OUT:=$(TARGET_INSTALLER_OUT)/root/system
            
            COMMON_MODULE_CLASSES:=JAVA_LIBRARIESNOTICE_FILES
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