Android.mk各项参数以及默认值文件（build/core/config.mk 及base

本文主要是介绍Android.mk各项参数以及默认值文件（build/core/config.mk 及base_rules.mk），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

build/core/config.mk 文件

# This is included by the top-level Makefile.
# It sets up standard variables based on the
# current configuration and platform, which
# are not specific to what is being built.

# 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 from main.mk, since envsetup.sh runs this file
# directly.
SHELL := /bin/bash
endif

# Tell python not to spam the source tree with .pyc files. This
# only has an effect on python 2.6 and above.
export PYTHONDONTWRITEBYTECODE := 1

# Standard source directories.
SRC_DOCS:= $(TOPDIR)docs
# TODO: Enforce some kind of layering; only add include paths
# when a module links against a particular library.
# TODO: See if we can remove most of these from the global list.
SRC_HEADERS := \
$(TOPDIR)system/core/include \
$(TOPDIR)hardware/libhardware/include \
$(TOPDIR)hardware/libhardware_legacy/include \
$(TOPDIR)hardware/ril/include \
$(TOPDIR)dalvik/libnativehelper/include \
$(TOPDIR)frameworks/base/include \
$(TOPDIR)frameworks/base/opengl/include \
$(TOPDIR)external/skia/include
SRC_HOST_HEADERS:=$(TOPDIR)tools/include
SRC_LIBRARIES:= $(TOPDIR)libs
SRC_SERVERS:= $(TOPDIR)servers
SRC_TARGET_DIR := $(TOPDIR)build/target
SRC_API_DIR := $(TOPDIR)frameworks/base/api

# Some specific paths to tools
SRC_DROIDDOC_DIR := $(TOPDIR)build/tools/droiddoc

# Various mappings to avoid hard-coding paths all over the place
include $(BUILD_SYSTEM)/pathmap.mk

# ###############################################################
# Build system internal files
# ###############################################################

BUILD_COMBOS:= $(BUILD_SYSTEM)/combo

CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk
BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk
BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk
BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk
BUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mk
BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk
BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk
BUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mk
BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk
BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk
BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk
BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk
BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk
BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk
BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk
BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk
BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk
BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk
BUILD_KEY_CHAR_MAP := $(BUILD_SYSTEM)/key_char_map.mk

# ###############################################################
# Parse out any modifier targets.
# ###############################################################

# The 'showcommands' goal says to show the full command
# lines being executed, instead of a short message about
# the kind of operation being done.
SHOW_COMMANDS:= $(filter showcommands,$(MAKECMDGOALS))

# ###############################################################
# Set common values
# ###############################################################

# These can be changed to modify both host and device modules.
COMMON_GLOBAL_CFLAGS:= -DANDROID -fmessage-length=0 -W -Wall -Wno-unused -Winit-self -Wpointer-arith
COMMON_RELEASE_CFLAGS:= -DNDEBUG -UDEBUG

COMMON_GLOBAL_CPPFLAGS:= $(COMMON_GLOBAL_CFLAGS) -Wsign-promo
COMMON_RELEASE_CPPFLAGS:= $(COMMON_RELEASE_CFLAGS)

# Set the extensions used for various packages
COMMON_PACKAGE_SUFFIX := .zip
COMMON_JAVA_PACKAGE_SUFFIX := .jar
COMMON_ANDROID_PACKAGE_SUFFIX := .apk

# list of flags to turn specific warnings in to errors
TARGET_ERROR_FLAGS := -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point

# TODO: do symbol compression
TARGET_COMPRESS_MODULE_SYMBOLS := false

# Default is to prelink modules.
TARGET_PRELINK_MODULE := true

# ###############################################################
# Include sub-configuration files
# ###############################################################

# ---------------------------------------------------------------
# Try to include buildspec.mk, which will try to set stuff up.
# If this file doesn't exist, the environemnt variables will
# be used, and if that doesn't work, then the default is an
# arm build
-include $(TOPDIR)buildspec.mk

# ---------------------------------------------------------------
# Define most of the global variables. These are the ones that
# are specific to the user's build configuration.
include $(BUILD_SYSTEM)/envsetup.mk

# Boards may be defined under $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)
# or under vendor/*/$(TARGET_DEVICE). Search in both places, but
# make sure only one exists.
# Real boards should always be associated with an OEM vendor.
board_config_mk := \
$(strip $(wildcard \
$(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)/BoardConfig.mk \
device/*/$(TARGET_DEVICE)/BoardConfig.mk \
vendor/*/$(TARGET_DEVICE)/BoardConfig.mk \
))
ifeq ($(board_config_mk),)
$(error No config file found for TARGET_DEVICE $(TARGET_DEVICE))
endif
ifneq ($(words $(board_config_mk)),1)
$(error Multiple board config files for TARGET_DEVICE $(TARGET_DEVICE): $(board_config_mk))
endif
include $(board_config_mk)
TARGET_DEVICE_DIR := $(patsubst %/,%,$(dir $(board_config_mk)))
board_config_mk :=

# Clean up/verify variables defined by the board config file.
TARGET_BOOTLOADER_BOARD_NAME := $(strip $(TARGET_BOOTLOADER_BOARD_NAME))
TARGET_CPU_ABI := $(strip $(TARGET_CPU_ABI))
ifeq ($(TARGET_CPU_ABI),)
$(error No TARGET_CPU_ABI defined by board config: $(board_config_mk))
endif
TARGET_CPU_ABI2 := $(strip $(TARGET_CPU_ABI2))

# $(1): os/arch
define select-android-config-h
system/core/include/arch/$(1)/AndroidConfig.h
endef

combo_target := HOST_
include $(BUILD_SYSTEM)/combo/select.mk

# on windows, the tools have .exe at the end, and we depend on the
# host config stuff being done first

combo_target := TARGET_
include $(BUILD_SYSTEM)/combo/select.mk

# Pick a Java compiler.
include $(BUILD_SYSTEM)/combo/javac.mk

# ---------------------------------------------------------------
# Check that the configuration is current. We check that
# BUILD_ENV_SEQUENCE_NUMBER is current against this value.
# Don't fail if we're called from envsetup, so they have a
# chance to update their environment.

ifeq (,$(strip $(CALLED_FROM_SETUP)))
ifneq (,$(strip $(BUILD_ENV_SEQUENCE_NUMBER)))
ifneq ($(BUILD_ENV_SEQUENCE_NUMBER),$(CORRECT_BUILD_ENV_SEQUENCE_NUMBER))
$(warning BUILD_ENV_SEQUENCE_NUMBER is set incorrectly.)
$(info *** If you use envsetup/lunch/