# 如果定义了ANDROID_BUILD_SHELL，则ANDROID_BUILD_SHELL
# 否则使用默认的/bin/bash
ifdef ANDROID_BUILD_SHELL
SHELL := $(ANDROID_BUILD_SHELL)
else
SHELL := /bin/bash
endif
# Utility variables.
empty :=
space := $(empty) $(empty)
comma := ,
# Note that make will eat the newline just before endef.
define newline
endef
# 不能简单的定义\或\\
backslash := \a
backslash := $(patsubst %a,%,$(backslash))
# python有关
export PYTHONDONTWRITEBYTECODE :=
# 标准源目录
SRC_DOCS:= $(TOPDIR)docs
# TODO: 强制一些层，当模块连接针对特定库时仅仅添加一些头文件路径
# TODO: 查看可以从这些全局列表删除的。
SRC_HEADERS := \
$(TOPDIR)system/core/include \
$(TOPDIR)hardware/libhardware/include \
$(TOPDIR)hardware/libhardware_legacy/include \
$(TOPDIR)hardware/ril/include \
$(TOPDIR)libnativehelper/include \
$(TOPDIR)frameworks/native/include \
$(TOPDIR)frameworks/native/opengl/include \
$(TOPDIR)frameworks/av/include \
$(TOPDIR)frameworks/base/include
SRC_HOST_HEADERS:=$(TOPDIR)tools/include
SRC_LIBRARIES:= $(TOPDIR)libs
SRC_SERVERS:= $(TOPDIR)servers
SRC_TARGET_DIR := $(TOPDIR)build/target
SRC_API_DIR := $(TOPDIR)prebuilts/sdk/api
SRC_SYSTEM_API_DIR := $(TOPDIR)prebuilts/sdk/system-api
# 特定工具的路径
SRC_DROIDDOC_DIR := $(TOPDIR)build/tools/droiddoc
# 避免硬件解码路径被覆盖的调用pathmap.mk建立硬解映射
include $(BUILD_SYSTEM)/pathmap.mk
# 构建系统内部文件（写Android.mk时会调用include头文件，也就是这些makefile文件）
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_PHONY_PACKAGE:= $(BUILD_SYSTEM)/phony_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_NATIVE_TEST := $(BUILD_SYSTEM)/native_test.mk
BUILD_HOST_NATIVE_TEST := $(BUILD_SYSTEM)/host_native_test.mk
BUILD_SHARED_TEST_LIBRARY := $(BUILD_SYSTEM)/shared_test_lib.mk
BUILD_HOST_SHARED_TEST_LIBRARY := $(BUILD_SYSTEM)/host_shared_test_lib.mk
BUILD_STATIC_TEST_LIBRARY := $(BUILD_SYSTEM)/static_test_lib.mk
BUILD_HOST_STATIC_TEST_LIBRARY := $(BUILD_SYSTEM)/host_static_test_lib.mk
BUILD_NOTICE_FILE := $(BUILD_SYSTEM)/notice_files.mk
BUILD_HOST_DALVIK_JAVA_LIBRARY := $(BUILD_SYSTEM)/host_dalvik_java_library.mk
BUILD_HOST_DALVIK_STATIC_JAVA_LIBRARY := $(BUILD_SYSTEM)/host_dalvik_static_java_library.mk
-include cts/build/config.mk
# 解析目标修饰符，make目标包含showcommands，则打印全命令
SHOW_COMMANDS:= $(filter showcommands,$(MAKECMDGOALS))
# 设置通用值
# 全局变量、cflags
COMMON_GLOBAL_CFLAGS:= -DANDROID -fmessage-length= -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)
# 不同包使用的扩展名
COMMON_PACKAGE_SUFFIX := .zip
COMMON_JAVA_PACKAGE_SUFFIX := .jar
COMMON_ANDROID_PACKAGE_SUFFIX := .apk
# flag列表改变错误中的不同警告
TARGET_ERROR_FLAGS := -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point
# 符号压缩
TARGET_COMPRESS_MODULE_SYMBOLS := false
# 包含底层配置文件
# -include:不是必须包含的
# 包含 buildspec.mk 可以设置一些东西。
# 如果文件不存在，则环境变量不会使用。如果不工作，则认为是arm build
ifndef ANDROID_BUILDSPEC
ANDROID_BUILDSPEC := $(TOPDIR)buildspec.mk
endif
-include $(ANDROID_BUILDSPEC)
# 包含一些环境设置
include $(BUILD_SYSTEM)/envsetup.mk
