main.mk
main.mk是整个编译系统的主导文件
代码分析
设定shell的类型，根据ANDROID_BUILD_SHELL来选择编译系统用到的shell
# Only use ANDROID_BUILD_SHELL to wrap around bash.
# DO NOT use other shells such as zsh.
ifdef ANDROID_BUILD_SHELL
SHELL := $(ANDROID_BUILD_SHELL)
else
# Use bash, not whatever shell somebody has installed as /bin/sh
# This is repeated in config.mk, since envsetup.sh runs that file
# directly.
SHELL := /bin/bash
endif
# this turns off the suffix rules built into make
.SUFFIXES:
# this turns off the RCS / SCCS implicit rules of GNU Make
% : RCS/%,v
% : RCS/%
% : %,v
% : s.%
% : SCCS/s.%
# If a rule fails, delete $@.
.DELETE_ON_ERROR:
# Figure out where we are.
#TOP := $(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))
#TOP := $(patsubst %/,%,$(TOP))
# TOPDIR is the normal variable you should use, because
# if we are executing relative to the current directory
# it can be "", whereas TOP must be "." which causes
# pattern matching problems when make strips off the
# trailing "./" from paths in various places.
#ifeq ($(TOP),.)
#TOPDIR :=
#else
#TOPDIR := $(TOP)/
#endif
检查make的版本，需要make的版本大于3.81，一般不会在Cygwin下进行编译，所以对Cygwin下的版本不进行检查
# Check for broken versions of make.
# (Allow any version under Cygwin since we don't actually build the platform there.)
ifeq (,$(findstring CYGWIN,$(shell uname -sm)))
ifneq (1,$(strip $(shell expr $(MAKE_VERSION) \>= 3.81)))
$(warning ********************************************************************************)
$(warning * You are using version $(MAKE_VERSION) of make.)
$(warning * Android can only be built by versions 3.81 and higher.)
$(warning * see https://source.android.com/source/download.html)
$(warning ********************************************************************************)
$(error stopping)
endif
endif
设定当前工作目录的相对路径
# Absolute path of the present working direcotry.
# This overrides the shell variable $PWD, which does not necessarily points to
# the top of the source tree, for example when "make -C" is used in m/mm/mmm.
PWD := $(shell pwd)
TOP := .
TOPDIR :=
BUILD_SYSTEM := $(TOPDIR)build/core
设定编译目标droid，如果使用make命令，后面不加任何参数的话，默认的目标即为droid
# This is the default target. It must be the first declared target.
.PHONY: droid
DEFAULT_GOAL := droid
$(DEFAULT_GOAL):
强制编译某个目标
# Used to force goals to build. Only use for conditionally defined goals.
.PHONY: FORCE
FORCE:
如果make后面所带的参数（需要编译的目标）在dont_bother_goals中出现，则将dont_bother变量的值设置为true
# These goals don't need to collect and include Android.mks/CleanSpec.mks
# in the source tree.
dont_bother_goals := clean clobber dataclean installclean \
help out \
snod systemimage-nodeps \
stnod systemtarball-nodeps \
userdataimage-nodeps userdatatarball-nodeps \
cacheimage-nodeps \
vendorimage-nodeps \
ramdisk-nodeps \
bootimage-nodeps \
recoveryimage-nodeps
ifneq ($(filter $(dont_bother_goals), $(MAKECMDGOALS)),)
dont_bother := true
endif
# Targets that provide quick help on the build system.
include $(BUILD_SYSTEM)/help.mk
包含build/core/config.mk文件，config.mk是一个总括性的文件，它里面定义了各种module编译所需要使用的HOST工具以及如何来编译各种模块。如果存在CTS特殊配置的config.mk也会包含进去
# Set up various standard variables based on configuration
# and host information.
include $(BUILD_SYSTEM)/config.mk
# CTS-specific config.
-include cts/build/config.mk
包含build/core/cleanbuild.mk，主要定义一些目标用于清除编译结果
# This allows us to force a clean build - included after the config.mk
# environment setup is done, but before we generate any dependencies. This
# file does the rm -rf inline so the deps which are all done below will
# be generated correctly
include $(BUILD_SYSTEM)/cleanbuild.mk
# Include the google-specific config
-include vendor/google/build/config.mk
VERSION_CHECK_SEQUENCE_NUMBER := 5
-include $(OUT_DIR)/versions_checked.mk
ifneq ($(VERSION_CHECK_SEQUENCE_NUMBER),$(VERSIONS_CHECKED))
检查编译工具版本，检查编译环境是否为大小写敏感
$(info Checking build tools versions...)
ifneq ($(HOST_OS),windows)
# check for a case sensitive file system
ifneq (a,$(shell mkdir -p $(OUT_DIR) ; \
echo a > $(OUT_DIR)/casecheck.txt; \
echo B > $(OUT_DIR)/CaseCheck.txt; \
cat $(OUT_DIR)/casecheck.txt))
$(warning ************************************************************)
$(warning You are building on a case-insensitive filesystem.)
$(warning Please move your source tree to a case-sensitive filesystem.)
$(warning ************************************************************)
$(error Case-insensitive filesystems not supported)
endif
endif
检查绝对路径中是否有空格
# Make sure that there are no spaces in the absolute path; the
# build system can't deal with them.
ifneq ($(words $(shell pwd)),1)
$(warning ************************************************************)
$(warning You are building in a directory whose absolute path contains)
$(warning a space character:)
$(warning $(space))
$(warning "$(shell pwd)")
$(warning $(space))
$(warning Please move your source tree to a path that does not contain)
$(warning any spaces.)
$(warning ************************************************************)
$(error Directory names containing spaces not supported)
endif
获取java，javac的版本信息
java_version_str := $(shell unset _JAVA_OPTIONS && java -version 2>&1)
javac_version_str := $(shell unset _JAVA_OPTIONS && javac -version 2>&1)
对java版本进行检查，如果设定了EXPERIMENTAL_USE_JAVA8的值使用1.8，默认为1.7
# Check for the correct version of java, should be 1.7 by
# default, and 1.8 if EXPERIMENTAL_USE_JAVA8 is set
ifneq ($(EXPERIMENTAL_USE_JAVA8),)
required_version := "1.8.x"
required_javac_version := "1.8"
java_version := $(shell echo '$(java_version_str)' | grep 'openjdk .*[ "]1\.8[\. "$$]')
javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.8[\. "$$]')
else # default
required_version := "1.7.x"
required_javac_version := "1.7"
java_version := $(shell echo '$(java_version_str)' | grep '^java .*[ "]1\.7[\. "$$]')
javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.7[\. "$$]')
endif # if EXPERIMENTAL_USE_JAVA8
ifeq ($(strip $(java_version)),)
$(info ************************************************************)
$(info You are attempting to build with the incorrect version)
$(info of java.)
$(info $(space))
$(info Your version is: $(java_version_str).)
$(info The required version is: $(required_version))
$(info $(space))
$(info Please follow the machine setup instructions at)
$(info $(space)$(space)$(space)$(space)https://source.android.com/source/initializing.html)
$(info ************************************************************)
$(error stop)
endif
检查JDK和javac的版本是否正确，如果是linux系统，需要的是OpenJDK，Mac OS的话需要Oracle JDK
# Check for the current JDK.
#
# For Java 1.7, we require OpenJDK on linux and Oracle JDK on Mac OS.
requires_openjdk := false
ifeq ($(HOST_OS), linux)
requires_openjdk := true
endif
# Check for the current jdk
ifeq ($(requires_openjdk), true)
# The user asked for java7 openjdk, so check that the host
# java version is really openjdk
ifeq ($(shell echo '$(java_version_str)' | grep -i openjdk),)
$(info ************************************************************)
$(info You asked for an OpenJDK 7 build but your version is)
$(info $(java_version_str).)
$(info ************************************************************)
$(error stop)
endif # java version is not OpenJdk
else # if requires_openjdk
ifneq ($(shell echo '$(java_version_str)' | grep -i openjdk),)
$(info ************************************************************)
$(info You are attempting to build with an unsupported JDK.)
$(info $(space))
$(info You use OpenJDK but only Sun/Oracle JDK is supported.)
$(info Please follow the machine setup instructions at)
$(info $(space)$(space)$(space)$(space)https://source.android.com/source/download.html)
$(info ************************************************************)
$(error stop)
endif # java version is not Sun Oracle JDK
endif # if requires_openjdk
# Check for the correct version of javac
ifeq ($(strip $(javac_version)),)
$(info ************************************************************)
$(info You are attempting to build with the incorrect version)
$(info of javac.)
$(info $(space))
$(info Your version is: $(javac_version_str).)
$(info The required version is: $(required_javac_version))
$(info $(space))
$(info Please follow the machine setup instructions at)
$(info $(space)$(space)$(space)$(space)https://source.android.com/source/download.html)
$(info ************************************************************)
$(error stop)
endif
设定变量表示是否可以编译一个模拟器镜像
ifndef BUILD_EMULATOR
# Emulator binaries are now provided under prebuilts/android-emulator/
BUILD_EMULATOR := false
endif
$(shell echo 'VERSIONS_CHECKED := $(VERSION_CHECK_SEQUENCE_NUMBER)' \
> $(OUT_DIR)/versions_checked.mk)
$(shell echo 'BUILD_EMULATOR ?= $(BUILD_EMULATOR)' \
>> $(OUT_DIR)/versions_checked.mk)
endif # ifneq ($(VERSION_CHECK_SEQUENCE_NUMBER),$(VERSIONS_CHECKED))
INTERNAL_MODIFIER_TARGETS表示用于修饰编译目标的目标，如果编译目标只有这些修饰用的目标，就会使用默认目标，showcommands不是真正的编译目标，只是用于编译时显示正在执行的命令
同时包含了build/core/definitions.mk和build/core/dex_preopt.mk
# These are the modifier targets that don't do anything themselves, but
# change the behavior of the build.
# (must be defined before including definitions.make)
INTERNAL_MODIFIER_TARGETS := showcommands all
# EMMA_INSTRUMENT_STATIC merges the static emma library to each emma-enabled module.
ifeq (true,$(EMMA_INSTRUMENT_STATIC))
EMMA_INSTRUMENT := true
endif
# Bring in standard build system definitions.
include $(BUILD_SYSTEM)/definitions.mk
# Bring in dex_preopt.mk
include $(BUILD_SYSTEM)/dex_preopt.mk
make后面不能接user、userdebug、eng等参数，只能在lunch或者choosecombo中使用
检查TARGET_BUILD_VARIANT是否为user，userdebug，eng中的类型，如果不是，抛出错误
ifneq ($(filter user userdebug eng,$(MAKECMDGOALS)),)
$(info ***************************************************************)
$(info ***************************************************************)
$(info Do not pass '$(filter user userdebug eng,$(MAKECMDGOALS))' on \
the make command line.)
$(info Set TARGET_BUILD_VARIANT in buildspec.mk, or use lunch or)
$(info choosecombo.)
$(info ***************************************************************)
$(info ***************************************************************)
$(error stopping)
endif
ifneq ($(filter-out $(INTERNAL_VALID_VARIANTS),$(TARGET_BUILD_VARIANT)),)
$(info ***************************************************************)
$(info ***************************************************************)
$(info Invalid variant: $(TARGET_BUILD_VARIANT))
$(info Valid values are: $(INTERNAL_VALID_VARIANTS))
$(info ***************************************************************)
$(info ***************************************************************)
$(error stopping)
endif
设定在PDK编译中java的支持等级以及包含pdk编译build/core/pdk_config.mk
# -----------------------------------------------------------------
# Variable to check java support level inside PDK build.
# Not necessary if the components is not in PDK.
# not defined : not supported
# "sdk" : sdk API only
# "platform" : platform API supproted
TARGET_BUILD_JAVA_SUPPORT_LEVEL := platform
# -----------------------------------------------------------------
# The pdk (Platform Development Kit) build
include build/core/pdk_config.mk
如果make后面的目标带有sdk、win_sdk、sdk_addon，则表示需要编译sdk
# -----------------------------------------------------------------
###
### In this section we set up the things that are different
### between the build variants
###
is_sdk_build :=
ifneq ($(filter sdk win_sdk sdk_addon,$(MAKECMDGOALS)),)
is_sdk_build := true
endif
设定一些与ART相关的系统属性值，installd会根据这些属性值传递一些标识给dex2oat
# Add build properties for ART. These define system properties used by installd
# to pass flags to dex2oat.
ADDITIONAL_BUILD_PROPERTIES += persist.sys.dalvik.vm.lib.2=libart
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.isa.$(TARGET_ARCH).variant=$(DEX2OAT_TARGET_CPU_VARIANT)
ifneq ($(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES),)
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.isa.$(TARGET_ARCH).features=$(DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
endif
ifdef TARGET_2ND_ARCH
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.isa.$(TARGET_2ND_ARCH).variant=$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_CPU_VARIANT)
ifneq ($($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES),)
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.isa.$(TARGET_2ND_ARCH).features=$($(TARGET_2ND_ARCH_VAR_PREFIX)DEX2OAT_TARGET_INSTRUCTION_SET_FEATURES)
endif
endif
根据编译类型(user, userdebug)，设定不同的属性值。若是在linux下编译user版本，还会默认把Dalvik preoptimization打开
## user/userdebug ##
user_variant := $(filter user userdebug,$(TARGET_BUILD_VARIANT))
enable_target_debugging := true
tags_to_install :=
ifneq (,$(user_variant))
# Target is secure in user builds.
ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=1
ADDITIONAL_DEFAULT_PROPERTIES += security.perf_harden=1
ifeq ($(user_variant),userdebug)
# Pick up some extra useful tools
tags_to_install += debug
else
# Disable debugging in plain user builds.
enable_target_debugging :=
endif
# Turn on Dalvik preoptimization for user builds, but only if not
# explicitly disabled and the build is running on Linux (since host
# Dalvik isn't built for non-Linux hosts).
ifeq (,$(WITH_DEXPREOPT))
ifeq ($(user_variant),user)
ifeq ($(HOST_OS),linux)
# TODO: turn on WITH_DEXPREOPT for libart user builds.
# WITH_DEXPREOPT := true
endif
endif
endif
# Disallow mock locations by default for user builds
ADDITIONAL_DEFAULT_PROPERTIES += ro.allow.mock.location=0
else # !user_variant
# Turn on checkjni for non-user builds.
ADDITIONAL_BUILD_PROPERTIES += ro.kernel.android.checkjni=1
# Set device insecure for non-user builds.
ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=0
# Allow mock locations by default for non user builds
ADDITIONAL_DEFAULT_PROPERTIES += ro.allow.mock.location=1
endif # !user_variant
ifeq (true,$(strip $(enable_target_debugging)))
# Target is more debuggable and adbd is on by default
ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=1
# Enable Dalvik lock contention logging.
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.lockprof.threshold=500
# Include the debugging/testing OTA keys in this build.
INCLUDE_TEST_OTA_KEYS := true
else # !enable_target_debugging
# Target is less debuggable and adbd is off by default
ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=0
endif # !enable_target_debugging
如果编译eng版本，设置向导为可选，同时is_sdk_build没有定义的话，则不会在eng版本上检查或者编译image和app，来提高开机速度
## eng ##
ifeq ($(TARGET_BUILD_VARIANT),eng)
tags_to_install := debug eng
ifneq ($(filter ro.setupwizard.mode=ENABLED, $(call collapse-pairs, $(ADDITIONAL_BUILD_PROPERTIES))),)
# Don't require the setup wizard on eng builds
ADDITIONAL_BUILD_PROPERTIES := $(filter-out ro.setupwizard.mode=%,\
$(call collapse-pairs, $(ADDITIONAL_BUILD_PROPERTIES))) \
ro.setupwizard.mode=OPTIONAL
endif
ifndef is_sdk_build
# Don't verify or compile the image on eng builds to speed startup.
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.image-dex2oat-filter=verify-at-runtime
# Don't verify or compile apps on eng builds to speed startup.
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.dex2oat-filter=verify-at-runtime
endif
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.usejit=true
endif
设定一些与sdk相关的变量和属性值
## sdk ##
ifdef is_sdk_build
# Detect if we want to build a repository for the SDK
sdk_repo_goal := $(strip $(filter sdk_repo,$(MAKECMDGOALS)))
MAKECMDGOALS := $(strip $(filter-out sdk_repo,$(MAKECMDGOALS)))
ifneq ($(words $(filter-out $(INTERNAL_MODIFIER_TARGETS) checkbuild emulator_tests target-files-package,$(MAKECMDGOALS))),1)
$(error The 'sdk' target may not be specified with any other targets)
endif
# TODO: this should be eng I think. Since the sdk is built from the eng
# variant.
tags_to_install := debug eng
ADDITIONAL_BUILD_PROPERTIES += xmpp.auto-presence=true
ADDITIONAL_BUILD_PROPERTIES += ro.config.nocheckin=yes
else # !sdk
endif
设定一个文件来记录追踪ANRs发生的原因
# enable vm tracing in files for now to help track
# the cause of ANRs in the content process
ADDITIONAL_BUILD_PROPERTIES += dalvik.vm.stack-trace-file=/data/anr/traces.txt
定义should-install-to-system，传入模块标签的列表，如果该模块需要安装在system中，返回非空值；在编译sdk目标时，对于任何带有samples标签的东西，即使模块同时包含有eng/debug/user，也要安装在data下
# ------------------------------------------------------------
# Define a function that, given a list of module tags, returns
# non-empty if that module should be installed in /system.
# For most goals, anything not tagged with the "tests" tag should
# be installed in /system.
define should-install-to-system
$(if $(filter tests,$(1)),,true)
endef
ifdef is_sdk_build
# For the sdk goal, anything with the "samples" tag should be
# installed in /data even if that module also has "eng"/"debug"/"user".
define should-install-to-system
$(if $(filter samples tests,$(1)),,true)
endef
endif
如果只是编译修饰目标，例如showcommands，就需要编译默认目标droid
# If they only used the modifier goals (showcommands, etc), we'll actually
# build the default target.
ifeq ($(filter-out $(INTERNAL_MODIFIER_TARGETS),$(MAKECMDGOALS)),)
.PHONY: $(INTERNAL_MODIFIER_TARGETS)
$(INTERNAL_MODIFIER_TARGETS): $(DEFAULT_GOAL)
endif
在windows系统下，只能编译sdk，并且引入一些编译sdk时需要的东西，其他系统下则进行常规的编译
# Bring in all modules that need to be built.
ifeq ($(HOST_OS),windows)
SDK_ONLY := true
endif
ifeq ($(SDK_ONLY),true)
include $(TOPDIR)sdk/build/windows_sdk_whitelist.mk
include $(TOPDIR)development/build/windows_sdk_whitelist.mk
# Exclude tools/acp when cross-compiling windows under linux
ifeq ($(findstring Linux,$(UNAME)),)
subdirs += build/tools/acp
endif
else # !SDK_ONLY
#
# Typical build; include any Android.mk files we can find.
#
subdirs := $(TOP)
FULL_BUILD := true
endif # !SDK_ONLY
在包含所有的模块的makefile之前，先暂存所有PRODUCT_*变量，等所有模块包含之后，再检查这些值是否被改变
# Before we go and include all of the module makefiles, stash away
# the PRODUCT_* values so that later we can verify they are not modified.
stash_product_vars:=true
ifeq ($(stash_product_vars),true)
$(call stash-product-vars, __STASHED)
endif
分别对mm和make等不同的编译方式进行配置
CUSTOM_MODULES：使用mm命令时，则被改成include $(ONE_SHOT_MAKEFILE)中所定义的模块
subdir_makefiles：表示所有要包含的子目录的makefile文件
ifneq ($(ONE_SHOT_MAKEFILE),)
# We've probably been invoked by the "mm" shell function
# with a subdirectory's makefile.
include $(ONE_SHOT_MAKEFILE)
# Change CUSTOM_MODULES to include only modules that were
# defined by this makefile; this will install all of those
# modules as a side-effect. Do this after including ONE_SHOT_MAKEFILE
# so that the modules will be installed in the same place they
# would have been with a normal make.
CUSTOM_MODULES := $(sort $(call get-tagged-modules,$(ALL_MODULE_TAGS)))
FULL_BUILD :=
# Stub out the notice targets, which probably aren't defined
# when using ONE_SHOT_MAKEFILE.
NOTICE-HOST-%: ;
NOTICE-TARGET-%: ;
# A helper goal printing out install paths
.PHONY: GET-INSTALL-PATH
GET-INSTALL-PATH:
@$(foreach m, $(ALL_MODULES), $(if $(ALL_MODULES.$(m).INSTALLED), \
echo 'INSTALL-PATH: $(m) $(ALL_MODULES.$(m).INSTALLED)';))
else # ONE_SHOT_MAKEFILE
ifneq ($(dont_bother),true)
#
# Include all of the makefiles in the system
#
# Can't use first-makefiles-under here because
# --mindepth=2 makes the prunes not work.
subdir_makefiles := \
$(shell build/tools/findleaves.py $(FIND_LEAVES_EXCLUDES) $(subdirs) Android.mk)
$(foreach mk, $(subdir_makefiles), $(info including $(mk) ...)$(eval include $(mk)))
endif # dont_bother
endif # ONE_SHOT_MAKEFILE
做一些清除工作
# Now with all Android.mks loaded we can do post cleaning steps.
include $(BUILD_SYSTEM)/post_clean.mk
ifeq ($(stash_product_vars),true)
$(call assert-product-vars, __STASHED)
endif
包含build/core/legacy_prebuilts.mk
ALL_PREBUILT是一种过时的机制，copy一个新文件时不要使用这种机制
到这里，所有的makefile文件都已经被包含了进来
include $(BUILD_SYSTEM)/legacy_prebuilts.mk
ifneq ($(filter-out $(GRANDFATHERED_ALL_PREBUILT),$(strip $(notdir $(ALL_PREBUILT)))),)
$(warning *** Some files have been added to ALL_PREBUILT.)
$(warning *)
$(warning * ALL_PREBUILT is a deprecated mechanism that)
$(warning * should not be used for new files.)
$(warning * As an alternative, use PRODUCT_COPY_FILES in)
$(warning * the appropriate product definition.)
$(warning * build/target/product/core.mk is the product)
$(warning * definition used in all products.)
$(warning *)
$(foreach bad_prebuilt,$(filter-out $(GRANDFATHERED_ALL_PREBUILT),$(strip $(notdir $(ALL_PREBUILT)))),$(warning * unexpected $(bad_prebuilt) in ALL_PREBUILT))
$(warning *)
$(error ALL_PREBUILT contains unexpected files)
endif
# -------------------------------------------------------------------
# All module makefiles have been included at this point.
# -------------------------------------------------------------------
将CUSTOM_MODULES指向已经安装的文件
# -------------------------------------------------------------------
# Fix up CUSTOM_MODULES to refer to installed files rather than
# just bare module names. Leave unknown modules alone in case
# they're actually full paths to a particular file.
known_custom_modules := $(filter $(ALL_MODULES),$(CUSTOM_MODULES))
unknown_custom_modules := $(filter-out $(ALL_MODULES),$(CUSTOM_MODULES))
CUSTOM_MODULES := \
$(call module-installed-files,$(known_custom_modules)) \
$(unknown_custom_modules)
设定各个模块对于各种库的依赖
add-required-deps：定义模块之间的依赖，参数1是依赖其他模块的模块，参数2是被参数 1模块依赖的模块
# -------------------------------------------------------------------
# Define dependencies for modules that require other modules.
# This can only happen now, after we've read in all module makefiles.
#
# TODO: deal with the fact that a bare module name isn't
# unambiguous enough. Maybe declare short targets like
# APPS:Quake or HOST:SHARED_LIBRARIES:libutils.
# BUG: the system image won't know to depend on modules that are
# brought in as requirements of other modules.
#
# Resolve the required module name to 32-bit or 64-bit variant.
# Get a list of corresponding 32-bit module names, if one exists.
define get-32-bit-modules
$(strip $(foreach m,$(1),\
$(if $(ALL_MODULES.$(m)$(TARGET_2ND_ARCH_MODULE_SUFFIX).CLASS),\
$(m)$(TARGET_2ND_ARCH_MODULE_SUFFIX))))
endef
# Get a list of corresponding 32-bit module names, if one exists;
# otherwise return the original module name
define get-32-bit-modules-if-we-can
$(strip $(foreach m,$(1),\
$(if $(ALL_MODULES.$(m)$(TARGET_2ND_ARCH_MODULE_SUFFIX).CLASS),\
$(m)$(TARGET_2ND_ARCH_MODULE_SUFFIX),
$(m))))
endef
# If a module is built for 32-bit, the required modules must be 32-bit too;
# Otherwise if the module is an exectuable or shared library,
# the required modules must be 64-bit;
# otherwise we require both 64-bit and 32-bit variant, if one exists.
$(foreach m,$(ALL_MODULES),\
$(eval r := $(ALL_MODULES.$(m).REQUIRED))\
$(if $(r),\
$(if $(ALL_MODULES.$(m).FOR_2ND_ARCH),\
$(eval r_r := $(call get-32-bit-modules-if-we-can,$(r))),\
$(if $(filter EXECUTABLES SHARED_LIBRARIES,$(ALL_MODULES.$(m).CLASS)),\
$(eval r_r := $(r)),\
$(eval r_r := $(r) $(call get-32-bit-modules,$(r)))\
)\
)\
$(eval ALL_MODULES.$(m).REQUIRED := $(strip $(r_r)))\
)\
)
r_r :=
define add-required-deps
$(1): | $(2)
endef
$(foreach m,$(ALL_MODULES), \
$(eval r := $(ALL_MODULES.$(m).REQUIRED)) \
$(if $(r), \
$(eval r := $(call module-installed-files,$(r))) \
$(eval t_m := $(filter $(TARGET_OUT_ROOT)/%, $(ALL_MODULES.$(m).INSTALLED))) \
$(eval h_m := $(filter $(HOST_OUT_ROOT)/%, $(ALL_MODULES.$(m).INSTALLED))) \
$(eval t_r := $(filter $(TARGET_OUT_ROOT)/%, $(r))) \
$(eval h_r := $(filter $(HOST_OUT_ROOT)/%, $(r))) \
$(eval t_m := $(filter-out $(t_r), $(t_m))) \
$(eval h_m := $(filter-out $(h_r), $(h_m))) \
$(if $(t_m), $(eval $(call add-required-deps, $(t_m),$(t_r)))) \
$(if $(h_m), $(eval $(call add-required-deps, $(h_m),$(h_r)))) \
) \
)
t_m :=
h_m :=
t_r :=
h_r :=
# Establish the dependecies on the shared libraries.
# It also adds the shared library module names to ALL_MODULES.$(m).REQUIRED,
# so they can be expanded to product_MODULES later.
# $(1): TARGET_ or HOST_.
# $(2): non-empty for 2nd arch.
define resolve-shared-libs-depes
$(foreach m,$($(if $(2),$($(1)2ND_ARCH_VAR_PREFIX))$(1)DEPENDENCIES_ON_SHARED_LIBRARIES),\
$(eval p := $(subst :,$(space),$(m)))\
$(eval mod := $(firstword $(p)))\
$(eval deps := $(subst $(comma),$(space),$(lastword $(p))))\
$(if $(2),$(eval deps := $(addsuffix $($(1)2ND_ARCH_MODULE_SUFFIX),$(deps))))\
$(eval r := $(filter $($(1)OUT_ROOT)/%,$(call module-installed-files,\
$(deps))))\
$(eval $(call add-required-deps,$(word 2,$(p)),$(r)))\
$(eval ALL_MODULES.$(mod).REQUIRED += $(deps)))
endef
$(call resolve-shared-libs-depes,TARGET_)
ifdef TARGET_2ND_ARCH
$(call resolve-shared-libs-depes,TARGET_,true)
endif
$(call resolve-shared-libs-depes,HOST_)
ifdef HOST_2ND_ARCH
$(call resolve-shared-libs-depes,HOST_,true)
endif
m :=
r :=
p :=
deps :=
add-required-deps :=
# -------------------------------------------------------------------
# Figure out our module sets.
#
# Of the modules defined by the component makefiles,
# determine what we actually want to build.
###########################################################
## Expand a module name list with REQUIRED modules
###########################################################
# $(1): The variable name that holds the initial module name list.
# the variable will be modified to hold the expanded results.
# $(2): The initial module name list.
# Returns empty string (maybe with some whitespaces).
define expand-required-modules
$(eval _erm_new_modules := $(sort $(filter-out $($(1)),\
$(foreach m,$(2),$(ALL_MODULES.$(m).REQUIRED)))))\
$(if $(_erm_new_modules),$(eval $(1) += $(_erm_new_modules))\
$(call expand-required-modules,$(1),$(_erm_new_modules)))
endef
ifdef FULL_BUILD
# The base list of modules to build for this product is specified
# by the appropriate product definition file, which was included
# by product_config.mk.
product_MODULES := $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES)
# Filter out the overridden packages before doing expansion
product_MODULES := $(filter-out $(foreach p, $(product_MODULES), \
$(PACKAGES.$(p).OVERRIDES)), $(product_MODULES))
# Resolve the :32 :64 module name
modules_32 := $(patsubst %:32,%,$(filter %:32, $(product_MODULES)))
modules_64 := $(patsubst %:64,%,$(filter %:64, $(product_MODULES)))
modules_rest := $(filter-out %:32 %:64,$(product_MODULES))
# Note for 32-bit product, $(modules_32) and $(modules_64) will be
# added as their original module names.
product_MODULES := $(call get-32-bit-modules-if-we-can, $(modules_32))
product_MODULES += $(modules_64)
# For the rest we add both
product_MODULES += $(call get-32-bit-modules, $(modules_rest))
product_MODULES += $(modules_rest)
$(call expand-required-modules,product_MODULES,$(product_MODULES))
product_FILES := $(call module-installed-files, $(product_MODULES))
ifeq (0,1)
$(info product_FILES for $(TARGET_DEVICE) ($(INTERNAL_PRODUCT)):)
$(foreach p,$(product_FILES),$(info : $(p)))
$(error done)
endif
else
# We're not doing a full build, and are probably only including
# a subset of the module makefiles. Don't try to build any modules
# requested by the product, because we probably won't have rules
# to build them.
product_FILES :=
endif
eng_MODULES := $(sort \
$(call get-tagged-modules,eng) \
$(call module-installed-files, $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES_ENG)) \
)
debug_MODULES := $(sort \
$(call get-tagged-modules,debug) \
$(call module-installed-files, $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES_DEBUG)) \
)
tests_MODULES := $(sort \
$(call get-tagged-modules,tests) \
$(call module-installed-files, $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES_TESTS)) \
)
设定modules_to_install的值，指的是需要安装的模块
# TODO: Remove the 3 places in the tree that use ALL_DEFAULT_INSTALLED_MODULES
# and get rid of it from this list.
modules_to_install := $(sort \
$(ALL_DEFAULT_INSTALLED_MODULES) \
$(product_FILES) \
$(foreach tag,$(tags_to_install),$($(tag)_MODULES)) \
$(CUSTOM_MODULES) \
)
设定需要被覆盖的包的集合，在这个集合里面的包不会进行编译安装
# Some packages may override others using LOCAL_OVERRIDES_PACKAGES.
# Filter out (do not install) any overridden packages.
overridden_packages := $(call get-package-overrides,$(modules_to_install))
ifdef overridden_packages
# old_modules_to_install := $(modules_to_install)
modules_to_install := \
$(filter-out $(foreach p,$(overridden_packages),$(p) %/$(p).apk), \
$(modules_to_install))
endif
#$(error filtered out
# $(filter-out $(modules_to_install),$(old_modules_to_install)))
编译sdk的时候不需要gnu
# Don't include any GNU General Public License shared objects or static
# libraries in SDK images. GPL executables (not static/dynamic libraries)
# are okay if they don't link against any closed source libraries (directly
# or indirectly)
# It's ok (and necessary) to build the host tools, but nothing that's
# going to be installed on the target (including static libraries).
ifdef is_sdk_build
target_gnu_MODULES := \
$(filter \
$(TARGET_OUT_INTERMEDIATES)/% \
$(TARGET_OUT)/% \
$(TARGET_OUT_DATA)/%, \
$(sort $(call get-tagged-modules,gnu)))
target_gnu_MODULES := $(filter-out $(TARGET_OUT_EXECUTABLES)/%,$(target_gnu_MODULES))
$(info Removing from sdk:)$(foreach d,$(target_gnu_MODULES),$(info : $(d)))
modules_to_install := \
$(filter-out $(target_gnu_MODULES),$(modules_to_install))
# Ensure every module listed in PRODUCT_PACKAGES* gets something installed
# TODO: Should we do this for all builds and not just the sdk?
dangling_modules :=
$(foreach m, $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES), \
$(if $(strip $(ALL_MODULES.$(m).INSTALLED) $(ALL_MODULES.$(m)$(TARGET_2ND_ARCH_MODULE_SUFFIX).INSTALLED)),,\
$(eval dangling_modules += $(m))))
ifneq ($(dangling_modules),)
$(warning: Modules '$(dangling_modules)' in PRODUCT_PACKAGES have nothing to install!)
endif
$(foreach m, $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES_DEBUG), \
$(if $(strip $(ALL_MODULES.$(m).INSTALLED)),,\
$(warning $(ALL_MODULES.$(m).MAKEFILE): Module '$(m)' in PRODUCT_PACKAGES_DEBUG has nothing to install!)))
$(foreach m, $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES_ENG), \
$(if $(strip $(ALL_MODULES.$(m).INSTALLED)),,\
$(warning $(ALL_MODULES.$(m).MAKEFILE): Module '$(m)' in PRODUCT_PACKAGES_ENG has nothing to install!)))
$(foreach m, $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_PACKAGES_TESTS), \
$(if $(strip $(ALL_MODULES.$(m).INSTALLED)),,\
$(warning $(ALL_MODULES.$(m).MAKEFILE): Module '$(m)' in PRODUCT_PACKAGES_TESTS has nothing to install!)))
endif
# build/core/Makefile contains extra stuff that we don't want to pollute this
# top-level makefile with. It expects that ALL_DEFAULT_INSTALLED_MODULES
# contains everything that's built during the current make, but it also further
# extends ALL_DEFAULT_INSTALLED_MODULES.
ALL_DEFAULT_INSTALLED_MODULES := $(modules_to_install)
include $(BUILD_SYSTEM)/Makefile
modules_to_install := $(sort $(ALL_DEFAULT_INSTALLED_MODULES))
ALL_DEFAULT_INSTALLED_MODULES :=
需要检验的模块，在base_rules.mk里定义需要检验的模块，如果想要编译所有的模块，可以在make后面加上all
# These are additional goals that we build, in order to make sure that there
# is as little code as possible in the tree that doesn't build.
modules_to_check := $(foreach m,$(ALL_MODULES),$(ALL_MODULES.$(m).CHECKED))
# If you would like to build all goals, and not skip any intermediate
# steps, you can pass the "all" modifier goal on the commandline.
ifneq ($(filter all,$(MAKECMDGOALS)),)
modules_to_check += $(foreach m,$(ALL_MODULES),$(ALL_MODULES.$(m).BUILT))
endif
# for easier debugging
modules_to_check := $(sort $(modules_to_check))
#$(error modules_to_check $(modules_to_check))
使用make prebuilt可编译需要预编译的所有目标
# -------------------------------------------------------------------
# This is used to to get the ordering right, you can also use these,
# but they're considered undocumented, so don't complain if their
# behavior changes.
.PHONY: prebuilt
prebuilt: $(ALL_PREBUILT)
# An internal target that depends on all copied headers
# (see copy_headers.make). Other targets that need the
# headers to be copied first can depend on this target.
.PHONY: all_copied_headers
all_copied_headers: ;
$(ALL_C_CPP_ETC_OBJECTS): | all_copied_headers
# All the droid stuff, in directories
.PHONY: files
files: prebuilt \
$(modules_to_install) \
$(INSTALLED_ANDROID_INFO_TXT_TARGET)
# -------------------------------------------------------------------
编译各种目标
.PHONY: checkbuild
checkbuild: $(modules_to_check)
ifeq (true,$(ANDROID_BUILD_EVERYTHING_BY_DEFAULT)$(filter $(MAKECMDGOALS),checkbuild))
droid: checkbuild
else
# ANDROID_BUILD_EVERYTHING_BY_DEFAULT not set, or checkbuild is one of the cmd goals.
checkbuild: droid
endif
.PHONY: ramdisk
ramdisk: $(INSTALLED_RAMDISK_TARGET)
.PHONY: systemtarball
systemtarball: $(INSTALLED_SYSTEMTARBALL_TARGET)
.PHONY: boottarball
boottarball: $(INSTALLED_BOOTTARBALL_TARGET)
.PHONY: userdataimage
userdataimage: $(INSTALLED_USERDATAIMAGE_TARGET)
ifneq (,$(filter userdataimage, $(MAKECMDGOALS)))
$(call dist-for-goals, userdataimage, $(BUILT_USERDATAIMAGE_TARGET))
endif
.PHONY: userdatatarball
userdatatarball: $(INSTALLED_USERDATATARBALL_TARGET)
.PHONY: cacheimage
cacheimage: $(INSTALLED_CACHEIMAGE_TARGET)
.PHONY: vendorimage
vendorimage: $(INSTALLED_VENDORIMAGE_TARGET)
.PHONY: bootimage
bootimage: $(INSTALLED_BOOTIMAGE_TARGET)
# phony target that include any targets in $(ALL_MODULES)
.PHONY: all_modules
ifndef BUILD_MODULES_IN_PATHS
all_modules: $(ALL_MODULES)
else
# BUILD_MODULES_IN_PATHS is a list of paths relative to the top of the tree
module_path_patterns := $(foreach p, $(BUILD_MODULES_IN_PATHS),\
$(if $(filter %/,$(p)),$(p)%,$(p)/%))
my_all_modules := $(sort $(foreach m, $(ALL_MODULES),$(if $(filter\
$(module_path_patterns), $(addsuffix /,$(ALL_MODULES.$(m).PATH))),$(m))))
all_modules: $(my_all_modules)
endif
# Build files and then package it into the rom formats
.PHONY: droidcore
droidcore: files \
systemimage \
$(INSTALLED_BOOTIMAGE_TARGET) \
$(INSTALLED_RECOVERYIMAGE_TARGET) \
$(INSTALLED_USERDATAIMAGE_TARGET) \
$(INSTALLED_CACHEIMAGE_TARGET) \
$(INSTALLED_VENDORIMAGE_TARGET) \
$(INSTALLED_FILES_FILE)
# dist_files only for putting your library into the dist directory with a full build.
.PHONY: dist_files
ifneq ($(TARGET_BUILD_APPS),)
# If this build is just for apps, only build apps and not the full system by default.
unbundled_build_modules :=
ifneq ($(filter all,$(TARGET_BUILD_APPS)),)
# If they used the magic goal "all" then build all apps in the source tree.
unbundled_build_modules := $(foreach m,$(sort $(ALL_MODULES)),$(if $(filter APPS,$(ALL_MODULES.$(m).CLASS)),$(m)))
else
unbundled_build_modules := $(TARGET_BUILD_APPS)
endif
# Dist the installed files if they exist.
apps_only_installed_files := $(foreach m,$(unbundled_build_modules),$(ALL_MODULES.$(m).INSTALLED))
$(call dist-for-goals,apps_only, $(apps_only_installed_files))
# For uninstallable modules such as static Java library, we have to dist the built file,
# as .
apps_only_dist_built_files := $(foreach m,$(unbundled_build_modules),$(if $(ALL_MODULES.$(m).INSTALLED),,\
$(if $(ALL_MODULES.$(m).BUILT),$(ALL_MODULES.$(m).BUILT):$(m)$(suffix $(ALL_MODULES.$(m).BUILT)))\
$(if $(ALL_MODULES.$(m).AAR),$(ALL_MODULES.$(m).AAR):$(m).aar)\
))
$(call dist-for-goals,apps_only, $(apps_only_dist_built_files))
ifeq ($(EMMA_INSTRUMENT),true)
$(EMMA_META_ZIP) : $(apps_only_installed_files)
$(call dist-for-goals,apps_only, $(EMMA_META_ZIP))
endif
$(PROGUARD_DICT_ZIP) : $(apps_only_installed_files)
$(call dist-for-goals,apps_only, $(PROGUARD_DICT_ZIP))
$(SYMBOLS_ZIP) : $(apps_only_installed_files)
$(call dist-for-goals,apps_only, $(SYMBOLS_ZIP))
.PHONY: apps_only
apps_only: $(unbundled_build_modules)
droid: apps_only
# Combine the NOTICE files for a apps_only build
$(eval $(call combine-notice-files, \
$(target_notice_file_txt), \
$(target_notice_file_html), \
"Notices for files for apps:", \
$(TARGET_OUT_NOTICE_FILES), \
$(apps_only_installed_files)))
else # TARGET_BUILD_APPS
$(call dist-for-goals, droidcore, \
$(INTERNAL_UPDATE_PACKAGE_TARGET) \
$(INTERNAL_OTA_PACKAGE_TARGET) \
$(BUILT_OTATOOLS_PACKAGE) \
$(SYMBOLS_ZIP) \
$(INSTALLED_FILES_FILE) \
$(INSTALLED_BUILD_PROP_TARGET) \
$(BUILT_TARGET_FILES_PACKAGE) \
$(INSTALLED_ANDROID_INFO_TXT_TARGET) \
$(INSTALLED_RAMDISK_TARGET) \
)
# Put a copy of the radio/bootloader files in the dist dir.
$(foreach f,$(INSTALLED_RADIOIMAGE_TARGET), \
$(call dist-for-goals, droidcore, $(f)))
ifneq ($(ANDROID_BUILD_EMBEDDED),true)
ifneq ($(TARGET_BUILD_PDK),true)
$(call dist-for-goals, droidcore, \
$(APPS_ZIP) \
$(INTERNAL_EMULATOR_PACKAGE_TARGET) \
$(PACKAGE_STATS_FILE) \
)
endif
endif
ifeq ($(EMMA_INSTRUMENT),true)
$(EMMA_META_ZIP) : $(INSTALLED_SYSTEMIMAGE)
$(call dist-for-goals, dist_files, $(EMMA_META_ZIP))
endif
# Building a full system-- the default is to build droidcore
droid: droidcore dist_files
endif # TARGET_BUILD_APPS
.PHONY: docs
docs: $(ALL_DOCS)
.PHONY: sdk
ALL_SDK_TARGETS := $(INTERNAL_SDK_TARGET)
sdk: $(ALL_SDK_TARGETS)
$(call dist-for-goals,sdk win_sdk, \
$(ALL_SDK_TARGETS) \
$(SYMBOLS_ZIP) \
$(INSTALLED_BUILD_PROP_TARGET) \
)
# umbrella targets to assit engineers in verifying builds
.PHONY: java native target host java-host java-target native-host native-target \
java-host-tests java-target-tests native-host-tests native-target-tests \
java-tests native-tests host-tests target-tests tests
# some synonyms
.PHONY: host-java target-java host-native target-native \
target-java-tests target-native-tests
host-java : java-host
target-java : java-target
host-native : native-host
target-native : native-target
target-java-tests : java-target-tests
target-native-tests : native-target-tests
tests : host-tests target-tests
# To catch more build breakage, check build tests modules in eng and userdebug builds.
ifneq ($(TARGET_BUILD_PDK),true)
ifneq ($(filter eng userdebug,$(TARGET_BUILD_VARIANT)),)
droidcore : target-tests host-tests
endif
endif
.PHONY: lintall
ifneq (,$(filter samplecode, $(MAKECMDGOALS)))
.PHONY: samplecode
sample_MODULES := $(sort $(call get-tagged-modules,samples))
sample_APKS_DEST_PATH := $(TARGET_COMMON_OUT_ROOT)/samples
sample_APKS_COLLECTION := \
$(foreach module,$(sample_MODULES),$(sample_APKS_DEST_PATH)/$(notdir $(module)))
$(foreach module,$(sample_MODULES),$(eval $(call \
copy-one-file,$(module),$(sample_APKS_DEST_PATH)/$(notdir $(module)))))
sample_ADDITIONAL_INSTALLED := \
$(filter-out $(modules_to_install) $(modules_to_check) $(ALL_PREBUILT),$(sample_MODULES))
samplecode: $(sample_APKS_COLLECTION)
@echo "Collect sample code apks: $^"
# remove apks that are not intended to be installed.
rm -f $(sample_ADDITIONAL_INSTALLED)
endif # samplecode in $(MAKECMDGOALS)
.PHONY: findbugs
findbugs: $(INTERNAL_FINDBUGS_HTML_TARGET) $(INTERNAL_FINDBUGS_XML_TARGET)
.PHONY: clean
clean:
@rm -rf $(OUT_DIR)/*
@echo "Entire build directory removed."
.PHONY: clobber
clobber: clean
# The rules for dataclean and installclean are defined in cleanbuild.mk.
#xxx scrape this from ALL_MODULE_NAME_TAGS
.PHONY: modules
modules:
@echo "Available sub-modules:"
@echo "$(call module-names-for-tag-list,$(ALL_MODULE_TAGS))" | \
tr -s ' ' '\n' | sort -u | $(COLUMN)
.PHONY: showcommands
showcommands:
@echo >/dev/null
.PHONY: nothing
nothing:
@echo Successfully read the makefiles.