Merge "Move the stable code from version_defaults.mk to version_util.mk." into... (5b79cdb6) · Commits · e / os / android_build

core/version_defaults.mk

+7 −228

Original line number	Diff line number	Diff line
		@@ -40,51 +40,10 @@ ifdef INTERNAL_BUILD_ID_MAKEFILE
		endif

		DEFAULT_PLATFORM_VERSION := TP1A
		.KATI_READONLY := DEFAULT_PLATFORM_VERSION
		MIN_PLATFORM_VERSION := TP1A
		MAX_PLATFORM_VERSION := TP1A

		ALLOWED_VERSIONS := $(call allowed-platform-versions,\
		$(MIN_PLATFORM_VERSION),\
		$(MAX_PLATFORM_VERSION),\
		$(DEFAULT_PLATFORM_VERSION))

		ifndef TARGET_PLATFORM_VERSION
		TARGET_PLATFORM_VERSION := $(DEFAULT_PLATFORM_VERSION)
		endif

		ifeq (,$(filter $(ALLOWED_VERSIONS), $(TARGET_PLATFORM_VERSION)))
		$(warning Invalid TARGET_PLATFORM_VERSION '$(TARGET_PLATFORM_VERSION)', must be one of)
		$(error $(ALLOWED_VERSIONS))
		endif
		ALLOWED_VERSIONS :=
		MIN_PLATFORM_VERSION :=
		MAX_PLATFORM_VERSION :=

		.KATI_READONLY := \
		DEFAULT_PLATFORM_VERSION \
		TARGET_PLATFORM_VERSION

		# Default versions for each TARGET_PLATFORM_VERSION
		# TODO: PLATFORM_VERSION, PLATFORM_SDK_VERSION, etc. should be conditional
		# on this

		# This is the canonical definition of the platform version,
		# which is the version that we reveal to the end user.
		# Update this value when the platform version changes (rather
		# than overriding it somewhere else). Can be an arbitrary string.

		# When you change PLATFORM_VERSION for a given PLATFORM_SDK_VERSION
		# please add that PLATFORM_VERSION as well as clean up obsolete PLATFORM_VERSION's
		# in the following text file:
		# cts/tests/tests/os/assets/platform_versions.txt

		# Note that there should be one PLATFORM_VERSION and PLATFORM_VERSION_CODENAME
		# entry for each unreleased API level, regardless of
		# MIN_PLATFORM_VERSION/MAX_PLATFORM_VERSION. PLATFORM_VERSION is used to
		# generate the range of allowed SDK versions, so it must have an entry for every
		# unreleased API level targetable by this branch, not just those that are valid
		# lunch targets for this branch.

		# The last stable version name of the platform that was released. During
		# development, this stays at that previous version, while the codename indicates
		# further work based on the previous version.
		@@ -95,49 +54,6 @@ PLATFORM_VERSION_LAST_STABLE := 12
		# release build. If this is a final release build, it is simply "REL".
		PLATFORM_VERSION_CODENAME.TP1A := Tiramisu

		ifndef PLATFORM_VERSION_CODENAME
		PLATFORM_VERSION_CODENAME := $(PLATFORM_VERSION_CODENAME.$(TARGET_PLATFORM_VERSION))
		ifndef PLATFORM_VERSION_CODENAME
		# PLATFORM_VERSION_CODENAME falls back to TARGET_PLATFORM_VERSION
		PLATFORM_VERSION_CODENAME := $(TARGET_PLATFORM_VERSION)
		endif

		# This is all of the active development codenames.
		# This confusing name is needed because
		# all_codenames has been baked into build.prop for ages.
		#
		# Should be either the same as PLATFORM_VERSION_CODENAME or a comma-separated
		# list of additional codenames after PLATFORM_VERSION_CODENAME.
		PLATFORM_VERSION_ALL_CODENAMES :=

		# Build a list of all active code names. Avoid duplicates, and stop when we
		# reach a codename that matches PLATFORM_VERSION_CODENAME (anything beyond
		# that is not included in our build).
		_versions_in_target := \
		$(call find_and_earlier,$(ALL_VERSIONS),$(TARGET_PLATFORM_VERSION))
		$(foreach version,$(_versions_in_target),\
		$(eval _codename := $(PLATFORM_VERSION_CODENAME.$(version)))\
		$(if $(filter $(_codename),$(PLATFORM_VERSION_ALL_CODENAMES)),,\
		$(eval PLATFORM_VERSION_ALL_CODENAMES += $(_codename))))

		# And convert from space separated to comma separated.
		PLATFORM_VERSION_ALL_CODENAMES := \
		$(subst $(space),$(comma),$(strip $(PLATFORM_VERSION_ALL_CODENAMES)))

		endif
		.KATI_READONLY := \
		PLATFORM_VERSION_CODENAME \
		PLATFORM_VERSION_ALL_CODENAMES

		ifndef PLATFORM_VERSION
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_VERSION := $(PLATFORM_VERSION_LAST_STABLE)
		else
		PLATFORM_VERSION := $(PLATFORM_VERSION_CODENAME)
		endif
		endif
		.KATI_READONLY := PLATFORM_VERSION

		ifndef PLATFORM_SDK_VERSION
		# This is the canonical definition of the SDK version, which defines
		# the set of APIs and functionality available in the platform. It
		@@ -156,89 +72,12 @@ endif
		.KATI_READONLY := PLATFORM_SDK_VERSION

		# This is the sdk extension version of this tree.
		PLATFORM_SDK_EXTENSION_VERSION :=$= 1
		PLATFORM_SDK_EXTENSION_VERSION := 1
		.KATI_READONLY := PLATFORM_SDK_EXTENSION_VERSION

		# This is the sdk extension version that PLATFORM_SDK_VERSION ships with.
		PLATFORM_BASE_SDK_EXTENSION_VERSION :=$= 0

		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_PREVIEW_SDK_VERSION := 0
		else
		ifndef PLATFORM_PREVIEW_SDK_VERSION
		# This is the definition of a preview SDK version over and above the current
		# platform SDK version. Unlike the platform SDK version, a higher value
		# for preview SDK version does NOT mean that all prior preview APIs are
		# included. Packages reading this value to determine compatibility with
		# known APIs should check that this value is precisely equal to the preview
		# SDK version the package was built for, otherwise it should fall back to
		# assuming the device can only support APIs as of the previous official
		# public release.
		# This value will always be forced to 0 for release builds by the logic
		# in the "ifeq" block above, so the value below will be used on any
		# non-release builds, and it should always be at least 1, to indicate that
		# APIs may have changed since the claimed PLATFORM_SDK_VERSION.
		PLATFORM_PREVIEW_SDK_VERSION := 1
		endif
		endif
		.KATI_READONLY := PLATFORM_PREVIEW_SDK_VERSION

		ifndef DEFAULT_APP_TARGET_SDK
		# This is the default minSdkVersion and targetSdkVersion to use for
		# all .apks created by the build system. It can be overridden by explicitly
		# setting these in the .apk's AndroidManifest.xml. It is either the code
		# name of the development build or, if this is a release build, the official
		# SDK version of this release.
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		DEFAULT_APP_TARGET_SDK := $(PLATFORM_SDK_VERSION)
		else
		DEFAULT_APP_TARGET_SDK := $(PLATFORM_VERSION_CODENAME)
		endif
		endif
		.KATI_READONLY := DEFAULT_APP_TARGET_SDK

		ifndef PLATFORM_VNDK_VERSION
		# This is the definition of the VNDK version for the current VNDK libraries.
		# The version is only available when PLATFORM_VERSION_CODENAME == REL.
		# Otherwise, it will be set to a CODENAME version. The ABI is allowed to be
		# changed only before the Android version is released. Once
		# PLATFORM_VNDK_VERSION is set to actual version, the ABI for this version
		# will be frozon and emit build errors if any ABI for the VNDK libs are
		# changed.
		# After that the snapshot of the VNDK with this version will be generated.
		#
		# The VNDK version follows PLATFORM_SDK_VERSION.
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_VNDK_VERSION := $(PLATFORM_SDK_VERSION)
		else
		PLATFORM_VNDK_VERSION := $(PLATFORM_VERSION_CODENAME)
		endif
		endif
		.KATI_READONLY := PLATFORM_VNDK_VERSION

		ifndef PLATFORM_SYSTEMSDK_MIN_VERSION
		# This is the oldest version of system SDK that the platform supports. Contrary
		# to the public SDK where platform essentially supports all previous SDK versions,
		# platform supports only a few number of recent system SDK versions as some of
		# old system APIs are gradually deprecated, removed and then deleted.
		PLATFORM_SYSTEMSDK_MIN_VERSION := 28
		endif
		.KATI_READONLY := PLATFORM_SYSTEMSDK_MIN_VERSION

		# This is the list of system SDK versions that the current platform supports.
		PLATFORM_SYSTEMSDK_VERSIONS :=
		ifneq (,$(PLATFORM_SYSTEMSDK_MIN_VERSION))
		$(if $(call math_is_number,$(PLATFORM_SYSTEMSDK_MIN_VERSION)),,\
		$(error PLATFORM_SYSTEMSDK_MIN_VERSION must be a number, but was $(PLATFORM_SYSTEMSDK_MIN_VERSION)))
		PLATFORM_SYSTEMSDK_VERSIONS := $(call int_range_list,$(PLATFORM_SYSTEMSDK_MIN_VERSION),$(PLATFORM_SDK_VERSION))
		endif
		# Platform always supports the current version
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_SYSTEMSDK_VERSIONS += $(PLATFORM_SDK_VERSION)
		else
		PLATFORM_SYSTEMSDK_VERSIONS += $(subst $(comma),$(space),$(PLATFORM_VERSION_ALL_CODENAMES))
		endif
		PLATFORM_SYSTEMSDK_VERSIONS := $(strip $(sort $(PLATFORM_SYSTEMSDK_VERSIONS)))
		.KATI_READONLY := PLATFORM_SYSTEMSDK_VERSIONS
		PLATFORM_BASE_SDK_EXTENSION_VERSION := 0
		.KATI_READONLY := PLATFORM_BASE_SDK_EXTENSION_VERSION

		ifndef PLATFORM_SECURITY_PATCH
		# Used to indicate the security patch that has been applied to the device.
		@@ -250,65 +89,5 @@ ifndef PLATFORM_SECURITY_PATCH
		endif
		.KATI_READONLY := PLATFORM_SECURITY_PATCH

		ifndef PLATFORM_SECURITY_PATCH_TIMESTAMP
		# Used to indicate the matching timestamp for the security patch string in PLATFORM_SECURITY_PATCH.
		PLATFORM_SECURITY_PATCH_TIMESTAMP := $(shell date -d 'TZ="GMT" $(PLATFORM_SECURITY_PATCH)' +%s)
		endif
		.KATI_READONLY := PLATFORM_SECURITY_PATCH_TIMESTAMP

		ifndef PLATFORM_BASE_OS
		# Used to indicate the base os applied to the device.
		# Can be an arbitrary string, but must be a single word.
		#
		# If there is no $PLATFORM_BASE_OS set, keep it empty.
		PLATFORM_BASE_OS :=
		endif
		.KATI_READONLY := PLATFORM_BASE_OS

		ifndef BUILD_ID
		# Used to signify special builds. E.g., branches and/or releases,
		# like "M5-RC7". Can be an arbitrary string, but must be a single
		# word and a valid file name.
		#
		# If there is no BUILD_ID set, make it obvious.
		BUILD_ID := UNKNOWN
		endif
		.KATI_READONLY := BUILD_ID

		ifndef BUILD_DATETIME
		# Used to reproduce builds by setting the same time. Must be the number
		# of seconds since the Epoch.
		BUILD_DATETIME := $(shell date +%s)
		endif
		include $(BUILD_SYSTEM)/version_util.mk

		DATE := date -d @$(BUILD_DATETIME)
		.KATI_READONLY := DATE

		# Everything should be using BUILD_DATETIME_FROM_FILE instead.
		# BUILD_DATETIME and DATE can be removed once BUILD_NUMBER moves
		# to soong_ui.
		$(KATI_obsolete_var BUILD_DATETIME,Use BUILD_DATETIME_FROM_FILE)

		HAS_BUILD_NUMBER := true
		ifndef BUILD_NUMBER
		# BUILD_NUMBER should be set to the source control value that
		# represents the current state of the source code. E.g., a
		# perforce changelist number or a git hash. Can be an arbitrary string
		# (to allow for source control that uses something other than numbers),
		# but must be a single word and a valid file name.
		#
		# If no BUILD_NUMBER is set, create a useful "I am an engineering build
		# from this date/time" value. Make it start with a non-digit so that
		# anyone trying to parse it as an integer will probably get "0".
		BUILD_NUMBER := eng.$(shell echo $${BUILD_USERNAME:0:6}).$(shell $(DATE) +%Y%m%d.%H%M%S)
		HAS_BUILD_NUMBER := false
		endif
		.KATI_READONLY := BUILD_NUMBER HAS_BUILD_NUMBER

		ifndef PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION
		# Used to set minimum supported target sdk version. Apps targeting sdk
		# version lower than the set value will result in a warning being shown
		# when any activity from the app is started.
		PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION := 23
		endif
		.KATI_READONLY := PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION

core/version_util.mk

0 → 100644

+245 −0

Original line number	Diff line number	Diff line
		#
		# Copyright (C) 2008 The Android Open Source Project
		#
		# Licensed under the Apache License, Version 2.0 (the "License");
		# you may not use this file except in compliance with the License.
		# You may obtain a copy of the License at
		#
		# http://www.apache.org/licenses/LICENSE-2.0
		#
		# Unless required by applicable law or agreed to in writing, software
		# distributed under the License is distributed on an "AS IS" BASIS,
		# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		# See the License for the specific language governing permissions and
		# limitations under the License.
		#

		#

		ALLOWED_VERSIONS := $(call allowed-platform-versions,\
		$(MIN_PLATFORM_VERSION),\
		$(MAX_PLATFORM_VERSION),\
		$(DEFAULT_PLATFORM_VERSION))

		ifndef TARGET_PLATFORM_VERSION
		TARGET_PLATFORM_VERSION := $(DEFAULT_PLATFORM_VERSION)
		endif

		ifeq (,$(filter $(ALLOWED_VERSIONS), $(TARGET_PLATFORM_VERSION)))
		$(warning Invalid TARGET_PLATFORM_VERSION '$(TARGET_PLATFORM_VERSION)', must be one of)
		$(error $(ALLOWED_VERSIONS))
		endif
		ALLOWED_VERSIONS :=
		MIN_PLATFORM_VERSION :=
		MAX_PLATFORM_VERSION :=

		.KATI_READONLY := TARGET_PLATFORM_VERSION

		# Default versions for each TARGET_PLATFORM_VERSION
		# TODO: PLATFORM_VERSION, PLATFORM_SDK_VERSION, etc. should be conditional
		# on this

		# This is the canonical definition of the platform version,
		# which is the version that we reveal to the end user.
		# Update this value when the platform version changes (rather
		# than overriding it somewhere else). Can be an arbitrary string.

		# When you change PLATFORM_VERSION for a given PLATFORM_SDK_VERSION
		# please add that PLATFORM_VERSION as well as clean up obsolete PLATFORM_VERSION's
		# in the following text file:
		# cts/tests/tests/os/assets/platform_versions.txt

		# Note that there should be one PLATFORM_VERSION and PLATFORM_VERSION_CODENAME
		# entry for each unreleased API level, regardless of
		# MIN_PLATFORM_VERSION/MAX_PLATFORM_VERSION. PLATFORM_VERSION is used to
		# generate the range of allowed SDK versions, so it must have an entry for every
		# unreleased API level targetable by this branch, not just those that are valid
		# lunch targets for this branch.

		ifndef PLATFORM_VERSION_CODENAME
		PLATFORM_VERSION_CODENAME := $(PLATFORM_VERSION_CODENAME.$(TARGET_PLATFORM_VERSION))
		ifndef PLATFORM_VERSION_CODENAME
		# PLATFORM_VERSION_CODENAME falls back to TARGET_PLATFORM_VERSION
		PLATFORM_VERSION_CODENAME := $(TARGET_PLATFORM_VERSION)
		endif

		# This is all of the active development codenames.
		# This confusing name is needed because
		# all_codenames has been baked into build.prop for ages.
		#
		# Should be either the same as PLATFORM_VERSION_CODENAME or a comma-separated
		# list of additional codenames after PLATFORM_VERSION_CODENAME.
		PLATFORM_VERSION_ALL_CODENAMES :=

		# Build a list of all active code names. Avoid duplicates, and stop when we
		# reach a codename that matches PLATFORM_VERSION_CODENAME (anything beyond
		# that is not included in our build).
		_versions_in_target := \
		$(call find_and_earlier,$(ALL_VERSIONS),$(TARGET_PLATFORM_VERSION))
		$(foreach version,$(_versions_in_target),\
		$(eval _codename := $(PLATFORM_VERSION_CODENAME.$(version)))\
		$(if $(filter $(_codename),$(PLATFORM_VERSION_ALL_CODENAMES)),,\
		$(eval PLATFORM_VERSION_ALL_CODENAMES += $(_codename))))

		# And convert from space separated to comma separated.
		PLATFORM_VERSION_ALL_CODENAMES := \
		$(subst $(space),$(comma),$(strip $(PLATFORM_VERSION_ALL_CODENAMES)))

		endif
		.KATI_READONLY := \
		PLATFORM_VERSION_CODENAME \
		PLATFORM_VERSION_ALL_CODENAMES

		ifndef PLATFORM_VERSION
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_VERSION := $(PLATFORM_VERSION_LAST_STABLE)
		else
		PLATFORM_VERSION := $(PLATFORM_VERSION_CODENAME)
		endif
		endif
		.KATI_READONLY := PLATFORM_VERSION


		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_PREVIEW_SDK_VERSION := 0
		else
		ifndef PLATFORM_PREVIEW_SDK_VERSION
		# This is the definition of a preview SDK version over and above the current
		# platform SDK version. Unlike the platform SDK version, a higher value
		# for preview SDK version does NOT mean that all prior preview APIs are
		# included. Packages reading this value to determine compatibility with
		# known APIs should check that this value is precisely equal to the preview
		# SDK version the package was built for, otherwise it should fall back to
		# assuming the device can only support APIs as of the previous official
		# public release.
		# This value will always be forced to 0 for release builds by the logic
		# in the "ifeq" block above, so the value below will be used on any
		# non-release builds, and it should always be at least 1, to indicate that
		# APIs may have changed since the claimed PLATFORM_SDK_VERSION.
		PLATFORM_PREVIEW_SDK_VERSION := 1
		endif
		endif
		.KATI_READONLY := PLATFORM_PREVIEW_SDK_VERSION

		ifndef DEFAULT_APP_TARGET_SDK
		# This is the default minSdkVersion and targetSdkVersion to use for
		# all .apks created by the build system. It can be overridden by explicitly
		# setting these in the .apk's AndroidManifest.xml. It is either the code
		# name of the development build or, if this is a release build, the official
		# SDK version of this release.
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		DEFAULT_APP_TARGET_SDK := $(PLATFORM_SDK_VERSION)
		else
		DEFAULT_APP_TARGET_SDK := $(PLATFORM_VERSION_CODENAME)
		endif
		endif
		.KATI_READONLY := DEFAULT_APP_TARGET_SDK

		ifndef PLATFORM_VNDK_VERSION
		# This is the definition of the VNDK version for the current VNDK libraries.
		# The version is only available when PLATFORM_VERSION_CODENAME == REL.
		# Otherwise, it will be set to a CODENAME version. The ABI is allowed to be
		# changed only before the Android version is released. Once
		# PLATFORM_VNDK_VERSION is set to actual version, the ABI for this version
		# will be frozon and emit build errors if any ABI for the VNDK libs are
		# changed.
		# After that the snapshot of the VNDK with this version will be generated.
		#
		# The VNDK version follows PLATFORM_SDK_VERSION.
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_VNDK_VERSION := $(PLATFORM_SDK_VERSION)
		else
		PLATFORM_VNDK_VERSION := $(PLATFORM_VERSION_CODENAME)
		endif
		endif
		.KATI_READONLY := PLATFORM_VNDK_VERSION

		ifndef PLATFORM_SYSTEMSDK_MIN_VERSION
		# This is the oldest version of system SDK that the platform supports. Contrary
		# to the public SDK where platform essentially supports all previous SDK versions,
		# platform supports only a few number of recent system SDK versions as some of
		# old system APIs are gradually deprecated, removed and then deleted.
		PLATFORM_SYSTEMSDK_MIN_VERSION := 28
		endif
		.KATI_READONLY := PLATFORM_SYSTEMSDK_MIN_VERSION

		# This is the list of system SDK versions that the current platform supports.
		PLATFORM_SYSTEMSDK_VERSIONS :=
		ifneq (,$(PLATFORM_SYSTEMSDK_MIN_VERSION))
		$(if $(call math_is_number,$(PLATFORM_SYSTEMSDK_MIN_VERSION)),,\
		$(error PLATFORM_SYSTEMSDK_MIN_VERSION must be a number, but was $(PLATFORM_SYSTEMSDK_MIN_VERSION)))
		PLATFORM_SYSTEMSDK_VERSIONS := $(call int_range_list,$(PLATFORM_SYSTEMSDK_MIN_VERSION),$(PLATFORM_SDK_VERSION))
		endif
		# Platform always supports the current version
		ifeq (REL,$(PLATFORM_VERSION_CODENAME))
		PLATFORM_SYSTEMSDK_VERSIONS += $(PLATFORM_SDK_VERSION)
		else
		PLATFORM_SYSTEMSDK_VERSIONS += $(subst $(comma),$(space),$(PLATFORM_VERSION_ALL_CODENAMES))
		endif
		PLATFORM_SYSTEMSDK_VERSIONS := $(strip $(sort $(PLATFORM_SYSTEMSDK_VERSIONS)))
		.KATI_READONLY := PLATFORM_SYSTEMSDK_VERSIONS

		.KATI_READONLY := PLATFORM_SECURITY_PATCH

		ifndef PLATFORM_SECURITY_PATCH_TIMESTAMP
		# Used to indicate the matching timestamp for the security patch string in PLATFORM_SECURITY_PATCH.
		PLATFORM_SECURITY_PATCH_TIMESTAMP := $(shell date -d 'TZ="GMT" $(PLATFORM_SECURITY_PATCH)' +%s)
		endif
		.KATI_READONLY := PLATFORM_SECURITY_PATCH_TIMESTAMP

		ifndef PLATFORM_BASE_OS
		# Used to indicate the base os applied to the device.
		# Can be an arbitrary string, but must be a single word.
		#
		# If there is no $PLATFORM_BASE_OS set, keep it empty.
		PLATFORM_BASE_OS :=
		endif
		.KATI_READONLY := PLATFORM_BASE_OS

		ifndef BUILD_ID
		# Used to signify special builds. E.g., branches and/or releases,
		# like "M5-RC7". Can be an arbitrary string, but must be a single
		# word and a valid file name.
		#
		# If there is no BUILD_ID set, make it obvious.
		BUILD_ID := UNKNOWN
		endif
		.KATI_READONLY := BUILD_ID

		ifndef BUILD_DATETIME
		# Used to reproduce builds by setting the same time. Must be the number
		# of seconds since the Epoch.
		BUILD_DATETIME := $(shell date +%s)
		endif

		DATE := date -d @$(BUILD_DATETIME)
		.KATI_READONLY := DATE

		# Everything should be using BUILD_DATETIME_FROM_FILE instead.
		# BUILD_DATETIME and DATE can be removed once BUILD_NUMBER moves
		# to soong_ui.
		$(KATI_obsolete_var BUILD_DATETIME,Use BUILD_DATETIME_FROM_FILE)

		HAS_BUILD_NUMBER := true
		ifndef BUILD_NUMBER
		# BUILD_NUMBER should be set to the source control value that
		# represents the current state of the source code. E.g., a
		# perforce changelist number or a git hash. Can be an arbitrary string
		# (to allow for source control that uses something other than numbers),
		# but must be a single word and a valid file name.
		#
		# If no BUILD_NUMBER is set, create a useful "I am an engineering build
		# from this date/time" value. Make it start with a non-digit so that
		# anyone trying to parse it as an integer will probably get "0".
		BUILD_NUMBER := eng.$(shell echo $${BUILD_USERNAME:0:6}).$(shell $(DATE) +%Y%m%d.%H%M%S)
		HAS_BUILD_NUMBER := false
		endif
		.KATI_READONLY := BUILD_NUMBER HAS_BUILD_NUMBER

		ifndef PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION
		# Used to set minimum supported target sdk version. Apps targeting sdk
		# version lower than the set value will result in a warning being shown
		# when any activity from the app is started.
		PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION := 23
		endif
		.KATI_READONLY := PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION