core/config.mk - fp2-dev/platform/build - Gitiles

 # 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)frameworks/base/native/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_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

 # ###############################################################
 # 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 shell is mksh. Other possible value is ash.
 TARGET_SHELL := mksh

 # ###############################################################
 # 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/choosecombo:)
 $(info ***   - Re-execute envsetup (". envsetup.sh"))
 $(info ***   - Re-run lunch or choosecombo)
 $(info *** If you use buildspec.mk:)
 $(info ***   - Look at buildspec.mk.default to see what has changed)
 $(info ***   - Update BUILD_ENV_SEQUENCE_NUMBER to "$(CORRECT_BUILD_ENV_SEQUENCE_NUMBER)")
 $(error bailing..)
 endif
 endif
 endif


 # ---------------------------------------------------------------
 # Generic tools.

 LEX:= flex
 YACC:= bison -d
 DOXYGEN:= doxygen
 AAPT := $(HOST_OUT_EXECUTABLES)/aapt$(HOST_EXECUTABLE_SUFFIX)
 AIDL := $(HOST_OUT_EXECUTABLES)/aidl$(HOST_EXECUTABLE_SUFFIX)
 PROTOC := $(HOST_OUT_EXECUTABLES)/aprotoc$(HOST_EXECUTABLE_SUFFIX)
 ICUDATA := $(HOST_OUT_EXECUTABLES)/icudata$(HOST_EXECUTABLE_SUFFIX)
 SIGNAPK_JAR := $(HOST_OUT_JAVA_LIBRARIES)/signapk$(COMMON_JAVA_PACKAGE_SUFFIX)
 MKBOOTFS := $(HOST_OUT_EXECUTABLES)/mkbootfs$(HOST_EXECUTABLE_SUFFIX)
 MINIGZIP := $(HOST_OUT_EXECUTABLES)/minigzip$(HOST_EXECUTABLE_SUFFIX)
 MKBOOTIMG := $(HOST_OUT_EXECUTABLES)/mkbootimg$(HOST_EXECUTABLE_SUFFIX)
 MKYAFFS2 := $(HOST_OUT_EXECUTABLES)/mkyaffs2image$(HOST_EXECUTABLE_SUFFIX)
 APICHECK := $(HOST_OUT_EXECUTABLES)/apicheck$(HOST_EXECUTABLE_SUFFIX)
 FS_GET_STATS := $(HOST_OUT_EXECUTABLES)/fs_get_stats$(HOST_EXECUTABLE_SUFFIX)
 MKEXT2IMG := $(HOST_OUT_EXECUTABLES)/genext2fs$(HOST_EXECUTABLE_SUFFIX)
 MAKE_EXT4FS := $(HOST_OUT_EXECUTABLES)/make_ext4fs$(HOST_EXECUTABLE_SUFFIX)
 MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg.sh
 MKEXT2BOOTIMG := external/genext2fs/mkbootimg_ext2.sh
 MKTARBALL := build/tools/mktarball.sh
 TUNE2FS := $(HOST_OUT_EXECUTABLES)/tune2fs$(HOST_EXECUTABLE_SUFFIX)
 E2FSCK := $(HOST_OUT_EXECUTABLES)/e2fsck$(HOST_EXECUTABLE_SUFFIX)
 JARJAR := $(HOST_OUT_JAVA_LIBRARIES)/jarjar.jar
 PROGUARD := external/proguard/bin/proguard.sh
 JAVATAGS := build/tools/java-event-log-tags.py
 LLVM_RS_CC := $(HOST_OUT_EXECUTABLES)/llvm-rs-cc$(HOST_EXECUTABLE_SUFFIX)
 LLVM_RS_LINK := $(HOST_OUT_EXECUTABLES)/llvm-rs-link$(HOST_EXECUTABLE_SUFFIX)
 DEXOPT := $(HOST_OUT_EXECUTABLES)/dexopt$(HOST_EXECUTABLE_SUFFIX)
 DEXPREOPT := dalvik/tools/dex-preopt

 # ACP is always for the build OS, not for the host OS
 ACP := $(BUILD_OUT_EXECUTABLES)/acp$(BUILD_EXECUTABLE_SUFFIX)

 # dx is java behind a shell script; no .exe necessary.
 DX := $(HOST_OUT_EXECUTABLES)/dx
 ZIPALIGN := $(HOST_OUT_EXECUTABLES)/zipalign$(HOST_EXECUTABLE_SUFFIX)
 FINDBUGS := prebuilt/common/findbugs/bin/findbugs
 LOCALIZE := $(HOST_OUT_EXECUTABLES)/localize$(HOST_EXECUTABLE_SUFFIX)
 EMMA_JAR := external/emma/lib/emma$(COMMON_JAVA_PACKAGE_SUFFIX)

 # Deal with archaic version of bison on Mac OS X.
 ifeq ($(filter 1.28,$(shell $(YACC) -V)),)
 YACC_HEADER_SUFFIX:= .hpp
 else
 YACC_HEADER_SUFFIX:= .cpp.h
 endif

 # Don't use column under Windows, cygwin or not
 ifeq ($(HOST_OS),windows)
 COLUMN:= cat
 else
 COLUMN:= column
 endif

 dir := $(shell uname)
 ifeq ($(HOST_OS),windows)
 dir := $(HOST_OS)
 endif
 ifeq ($(HOST_OS),darwin)
 dir := $(HOST_OS)-$(HOST_ARCH)
 endif
 OLD_FLEX := prebuilt/$(HOST_PREBUILT_TAG)/flex/flex-2.5.4a$(HOST_EXECUTABLE_SUFFIX)

 ifeq ($(HOST_OS),darwin)
 # Mac OS' screwy version of java uses a non-standard directory layout
 # and doesn't even seem to have tools.jar.  On the other hand, javac seems
 # to be able to magically find the classes in there, wherever they are, so
 # leave this blank
 HOST_JDK_TOOLS_JAR :=
 else
 HOST_JDK_TOOLS_JAR:= $(shell $(BUILD_SYSTEM)/find-jdk-tools-jar.sh)
 ifeq ($(wildcard $(HOST_JDK_TOOLS_JAR)),)
 $(error Error: could not find jdk tools.jar, please install JDK6, \
     which you can download from java.sun.com)
 endif
 endif

 # Is the host JDK 64-bit version?
 HOST_JDK_IS_64BIT_VERSION :=
 ifneq ($(filter 64-Bit, $(shell java -version 2>&1)),)
 HOST_JDK_IS_64BIT_VERSION := true
 endif

 # It's called md5 on Mac OS and md5sum on Linux
 ifeq ($(HOST_OS),darwin)
 MD5SUM:=md5 -q
 else
 MD5SUM:=md5sum
 endif

 APICHECK_CLASSPATH := $(HOST_JDK_TOOLS_JAR)
 APICHECK_CLASSPATH := $(APICHECK_CLASSPATH):$(HOST_OUT_JAVA_LIBRARIES)/doclava$(COMMON_JAVA_PACKAGE_SUFFIX)
 APICHECK_CLASSPATH := $(APICHECK_CLASSPATH):$(HOST_OUT_JAVA_LIBRARIES)/jsilver$(COMMON_JAVA_PACKAGE_SUFFIX)
 APICHECK_COMMAND := $(APICHECK) -JXmx1024m -J"classpath $(APICHECK_CLASSPATH)"

 # ###############################################################
 # Set up final options.
 # ###############################################################

 HOST_GLOBAL_CFLAGS += $(COMMON_GLOBAL_CFLAGS)
 HOST_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)

 HOST_GLOBAL_CPPFLAGS += $(COMMON_GLOBAL_CPPFLAGS)
 HOST_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)

 TARGET_GLOBAL_CFLAGS += $(COMMON_GLOBAL_CFLAGS)
 TARGET_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)

 TARGET_GLOBAL_CPPFLAGS += $(COMMON_GLOBAL_CPPFLAGS)
 TARGET_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)

 HOST_GLOBAL_LD_DIRS += -L$(HOST_OUT_INTERMEDIATE_LIBRARIES)
 TARGET_GLOBAL_LD_DIRS += -L$(TARGET_OUT_INTERMEDIATE_LIBRARIES)

 HOST_PROJECT_INCLUDES:= $(SRC_HEADERS) $(SRC_HOST_HEADERS) $(HOST_OUT_HEADERS)
 TARGET_PROJECT_INCLUDES:= $(SRC_HEADERS) $(TARGET_OUT_HEADERS)

 # Many host compilers don't support these flags, so we have to make
 # sure to only specify them for the target compilers checked in to
 # the source tree.
 TARGET_GLOBAL_CFLAGS += $(TARGET_ERROR_FLAGS)
 TARGET_GLOBAL_CPPFLAGS += $(TARGET_ERROR_FLAGS)

 HOST_GLOBAL_CFLAGS += $(HOST_RELEASE_CFLAGS)
 HOST_GLOBAL_CPPFLAGS += $(HOST_RELEASE_CPPFLAGS)

 TARGET_GLOBAL_CFLAGS += $(TARGET_RELEASE_CFLAGS)
 TARGET_GLOBAL_CPPFLAGS += $(TARGET_RELEASE_CPPFLAGS)

 PREBUILT_IS_PRESENT := $(if $(wildcard prebuilt/Android.mk),true)

 # ###############################################################
 # Collect a list of the SDK versions that we could compile against
 # For use with the LOCAL_SDK_VERSION variable for include $(BUILD_PACKAGE)
 # ###############################################################

 HISTORICAL_SDK_VERSIONS_ROOT := $(TOPDIR)prebuilt/sdk
 HISTORICAL_NDK_VERSIONS_ROOT := $(TOPDIR)prebuilt/ndk

 # Historical SDK version N is stored in $(HISTORICAL_SDK_VERSIONS_ROOT)/N.
 # The 'current' version is whatever this source tree is.
 #
 # sgrax     is the opposite of xargs.  It takes the list of args and puts them
 #           on each line for sort to process.
 # sort -g   is a numeric sort, so 1 2 3 10 instead of 1 10 2 3.

 # Numerically sort a list of numbers
 # $(1): the list of numbers to be sorted
 define numerically_sort
 $(shell function sgrax() { \
     while [ -n "$$1" ] ; do echo $$1 ; shift ; done \
     } ; \
     ( sgrax $(1) | sort -g ) )
 endef

 TARGET_AVAILABLE_SDK_VERSIONS := current $(call numerically_sort,\
     $(patsubst $(HISTORICAL_SDK_VERSIONS_ROOT)/%/android.jar,%, \
     $(wildcard $(HISTORICAL_SDK_VERSIONS_ROOT)/*/android.jar)))

 TARGET_AVAILABLE_NDK_VERSIONS := $(call numerically_sort,\
     $(patsubst $(HISTORICAL_NDK_VERSIONS_ROOT)/android-ndk-r%,%, \
     $(wildcard $(HISTORICAL_NDK_VERSIONS_ROOT)/android-ndk-r*)))

 INTERNAL_PLATFORM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/public_api.txt

 # This is the standard way to name a directory containing prebuilt target
 # objects. E.g., prebuilt/$(TARGET_PREBUILT_TAG)/libc.so
 TARGET_PREBUILT_TAG := android-$(TARGET_ARCH)

 include $(BUILD_SYSTEM)/dumpvar.mk
	# 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)frameworks/base/native/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_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

	# ###############################################################
	# 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 shell is mksh. Other possible value is ash.
	TARGET_SHELL := mksh

	# ###############################################################
	# 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/choosecombo:)
	$(info *** - Re-execute envsetup (". envsetup.sh"))
	$(info *** - Re-run lunch or choosecombo)
	$(info *** If you use buildspec.mk:)
	$(info *** - Look at buildspec.mk.default to see what has changed)
	$(info *** - Update BUILD_ENV_SEQUENCE_NUMBER to "$(CORRECT_BUILD_ENV_SEQUENCE_NUMBER)")
	$(error bailing..)
	endif
	endif
	endif


	# ---------------------------------------------------------------
	# Generic tools.

	LEX:= flex
	YACC:= bison -d
	DOXYGEN:= doxygen
	AAPT := $(HOST_OUT_EXECUTABLES)/aapt$(HOST_EXECUTABLE_SUFFIX)
	AIDL := $(HOST_OUT_EXECUTABLES)/aidl$(HOST_EXECUTABLE_SUFFIX)
	PROTOC := $(HOST_OUT_EXECUTABLES)/aprotoc$(HOST_EXECUTABLE_SUFFIX)
	ICUDATA := $(HOST_OUT_EXECUTABLES)/icudata$(HOST_EXECUTABLE_SUFFIX)
	SIGNAPK_JAR := $(HOST_OUT_JAVA_LIBRARIES)/signapk$(COMMON_JAVA_PACKAGE_SUFFIX)
	MKBOOTFS := $(HOST_OUT_EXECUTABLES)/mkbootfs$(HOST_EXECUTABLE_SUFFIX)
	MINIGZIP := $(HOST_OUT_EXECUTABLES)/minigzip$(HOST_EXECUTABLE_SUFFIX)
	MKBOOTIMG := $(HOST_OUT_EXECUTABLES)/mkbootimg$(HOST_EXECUTABLE_SUFFIX)
	MKYAFFS2 := $(HOST_OUT_EXECUTABLES)/mkyaffs2image$(HOST_EXECUTABLE_SUFFIX)
	APICHECK := $(HOST_OUT_EXECUTABLES)/apicheck$(HOST_EXECUTABLE_SUFFIX)
	FS_GET_STATS := $(HOST_OUT_EXECUTABLES)/fs_get_stats$(HOST_EXECUTABLE_SUFFIX)
	MKEXT2IMG := $(HOST_OUT_EXECUTABLES)/genext2fs$(HOST_EXECUTABLE_SUFFIX)
	MAKE_EXT4FS := $(HOST_OUT_EXECUTABLES)/make_ext4fs$(HOST_EXECUTABLE_SUFFIX)
	MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg.sh
	MKEXT2BOOTIMG := external/genext2fs/mkbootimg_ext2.sh
	MKTARBALL := build/tools/mktarball.sh
	TUNE2FS := $(HOST_OUT_EXECUTABLES)/tune2fs$(HOST_EXECUTABLE_SUFFIX)
	E2FSCK := $(HOST_OUT_EXECUTABLES)/e2fsck$(HOST_EXECUTABLE_SUFFIX)
	JARJAR := $(HOST_OUT_JAVA_LIBRARIES)/jarjar.jar
	PROGUARD := external/proguard/bin/proguard.sh
	JAVATAGS := build/tools/java-event-log-tags.py
	LLVM_RS_CC := $(HOST_OUT_EXECUTABLES)/llvm-rs-cc$(HOST_EXECUTABLE_SUFFIX)
	LLVM_RS_LINK := $(HOST_OUT_EXECUTABLES)/llvm-rs-link$(HOST_EXECUTABLE_SUFFIX)
	DEXOPT := $(HOST_OUT_EXECUTABLES)/dexopt$(HOST_EXECUTABLE_SUFFIX)
	DEXPREOPT := dalvik/tools/dex-preopt

	# ACP is always for the build OS, not for the host OS
	ACP := $(BUILD_OUT_EXECUTABLES)/acp$(BUILD_EXECUTABLE_SUFFIX)

	# dx is java behind a shell script; no .exe necessary.
	DX := $(HOST_OUT_EXECUTABLES)/dx
	ZIPALIGN := $(HOST_OUT_EXECUTABLES)/zipalign$(HOST_EXECUTABLE_SUFFIX)
	FINDBUGS := prebuilt/common/findbugs/bin/findbugs
	LOCALIZE := $(HOST_OUT_EXECUTABLES)/localize$(HOST_EXECUTABLE_SUFFIX)
	EMMA_JAR := external/emma/lib/emma$(COMMON_JAVA_PACKAGE_SUFFIX)

	# Deal with archaic version of bison on Mac OS X.
	ifeq ($(filter 1.28,$(shell $(YACC) -V)),)
	YACC_HEADER_SUFFIX:= .hpp
	else
	YACC_HEADER_SUFFIX:= .cpp.h
	endif

	# Don't use column under Windows, cygwin or not
	ifeq ($(HOST_OS),windows)
	COLUMN:= cat
	else
	COLUMN:= column
	endif

	dir := $(shell uname)
	ifeq ($(HOST_OS),windows)
	dir := $(HOST_OS)
	endif
	ifeq ($(HOST_OS),darwin)
	dir := $(HOST_OS)-$(HOST_ARCH)
	endif
	OLD_FLEX := prebuilt/$(HOST_PREBUILT_TAG)/flex/flex-2.5.4a$(HOST_EXECUTABLE_SUFFIX)

	ifeq ($(HOST_OS),darwin)
	# Mac OS' screwy version of java uses a non-standard directory layout
	# and doesn't even seem to have tools.jar. On the other hand, javac seems
	# to be able to magically find the classes in there, wherever they are, so
	# leave this blank
	HOST_JDK_TOOLS_JAR :=
	else
	HOST_JDK_TOOLS_JAR:= $(shell $(BUILD_SYSTEM)/find-jdk-tools-jar.sh)
	ifeq ($(wildcard $(HOST_JDK_TOOLS_JAR)),)
	$(error Error: could not find jdk tools.jar, please install JDK6, \
	which you can download from java.sun.com)
	endif
	endif

	# Is the host JDK 64-bit version?
	HOST_JDK_IS_64BIT_VERSION :=
	ifneq ($(filter 64-Bit, $(shell java -version 2>&1)),)
	HOST_JDK_IS_64BIT_VERSION := true
	endif

	# It's called md5 on Mac OS and md5sum on Linux
	ifeq ($(HOST_OS),darwin)
	MD5SUM:=md5 -q
	else
	MD5SUM:=md5sum
	endif

	APICHECK_CLASSPATH := $(HOST_JDK_TOOLS_JAR)
	APICHECK_CLASSPATH := $(APICHECK_CLASSPATH):$(HOST_OUT_JAVA_LIBRARIES)/doclava$(COMMON_JAVA_PACKAGE_SUFFIX)
	APICHECK_CLASSPATH := $(APICHECK_CLASSPATH):$(HOST_OUT_JAVA_LIBRARIES)/jsilver$(COMMON_JAVA_PACKAGE_SUFFIX)
	APICHECK_COMMAND := $(APICHECK) -JXmx1024m -J"classpath $(APICHECK_CLASSPATH)"

	# ###############################################################
	# Set up final options.
	# ###############################################################

	HOST_GLOBAL_CFLAGS += $(COMMON_GLOBAL_CFLAGS)
	HOST_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)

	HOST_GLOBAL_CPPFLAGS += $(COMMON_GLOBAL_CPPFLAGS)
	HOST_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)

	TARGET_GLOBAL_CFLAGS += $(COMMON_GLOBAL_CFLAGS)
	TARGET_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)

	TARGET_GLOBAL_CPPFLAGS += $(COMMON_GLOBAL_CPPFLAGS)
	TARGET_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)

	HOST_GLOBAL_LD_DIRS += -L$(HOST_OUT_INTERMEDIATE_LIBRARIES)
	TARGET_GLOBAL_LD_DIRS += -L$(TARGET_OUT_INTERMEDIATE_LIBRARIES)

	HOST_PROJECT_INCLUDES:= $(SRC_HEADERS) $(SRC_HOST_HEADERS) $(HOST_OUT_HEADERS)
	TARGET_PROJECT_INCLUDES:= $(SRC_HEADERS) $(TARGET_OUT_HEADERS)

	# Many host compilers don't support these flags, so we have to make
	# sure to only specify them for the target compilers checked in to
	# the source tree.
	TARGET_GLOBAL_CFLAGS += $(TARGET_ERROR_FLAGS)
	TARGET_GLOBAL_CPPFLAGS += $(TARGET_ERROR_FLAGS)

	HOST_GLOBAL_CFLAGS += $(HOST_RELEASE_CFLAGS)
	HOST_GLOBAL_CPPFLAGS += $(HOST_RELEASE_CPPFLAGS)

	TARGET_GLOBAL_CFLAGS += $(TARGET_RELEASE_CFLAGS)
	TARGET_GLOBAL_CPPFLAGS += $(TARGET_RELEASE_CPPFLAGS)

	PREBUILT_IS_PRESENT := $(if $(wildcard prebuilt/Android.mk),true)

	# ###############################################################
	# Collect a list of the SDK versions that we could compile against
	# For use with the LOCAL_SDK_VERSION variable for include $(BUILD_PACKAGE)
	# ###############################################################

	HISTORICAL_SDK_VERSIONS_ROOT := $(TOPDIR)prebuilt/sdk
	HISTORICAL_NDK_VERSIONS_ROOT := $(TOPDIR)prebuilt/ndk

	# Historical SDK version N is stored in $(HISTORICAL_SDK_VERSIONS_ROOT)/N.
	# The 'current' version is whatever this source tree is.
	#
	# sgrax is the opposite of xargs. It takes the list of args and puts them
	# on each line for sort to process.
	# sort -g is a numeric sort, so 1 2 3 10 instead of 1 10 2 3.

	# Numerically sort a list of numbers
	# $(1): the list of numbers to be sorted
	define numerically_sort
	$(shell function sgrax() { \
	while [ -n "$$1" ] ; do echo $$1 ; shift ; done \
	} ; \
	( sgrax $(1) \| sort -g ) )
	endef

	TARGET_AVAILABLE_SDK_VERSIONS := current $(call numerically_sort,\
	$(patsubst $(HISTORICAL_SDK_VERSIONS_ROOT)/%/android.jar,%, \
	$(wildcard $(HISTORICAL_SDK_VERSIONS_ROOT)/*/android.jar)))

	TARGET_AVAILABLE_NDK_VERSIONS := $(call numerically_sort,\
	$(patsubst $(HISTORICAL_NDK_VERSIONS_ROOT)/android-ndk-r%,%, \
	$(wildcard $(HISTORICAL_NDK_VERSIONS_ROOT)/android-ndk-r*)))

	INTERNAL_PLATFORM_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/public_api.txt

	# This is the standard way to name a directory containing prebuilt target
	# objects. E.g., prebuilt/$(TARGET_PREBUILT_TAG)/libc.so
	TARGET_PREBUILT_TAG := android-$(TARGET_ARCH)

	include $(BUILD_SYSTEM)/dumpvar.mk