Android Make build system

version_defaults.mk

#
# Handle various build version information.
#
# Guarantees that the following are defined:
#     PLATFORM_VERSION
#     PLATFORM_SDK_VERSION
#     PLATFORM_VERSION_CODENAME
#     DEFAULT_APP_TARGET_SDK
#     BUILD_ID
#     BUILD_NUMBER
#     BUILD_DATETIME
#     PLATFORM_SECURITY_PATCH
#

# Look for an optional file containing overrides of the defaults,
# but don't cry if we don't find it.  We could just use -include, but
# the build.prop target also wants INTERNAL_BUILD_ID_MAKEFILE to be set
# if the file exists.
#
INTERNAL_BUILD_ID_MAKEFILE := $(wildcard $(BUILD_SYSTEM)/build_id.mk)
ifdef INTERNAL_BUILD_ID_MAKEFILE
  include $(INTERNAL_BUILD_ID_MAKEFILE)
endif

DEFAULT_PLATFORM_VERSION := OPM1
MIN_PLATFORM_VERSION := OPM1
MAX_PLATFORM_VERSION := OPM1

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

# 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 add a new PLATFORM_VERSION which will result in a new
# PLATFORM_SDK_VERSION please ensure you add a corresponding isAtLeast*
# method in the following java file:
# frameworks/support/compat/gingerbread/android/support/v4/os/BuildCompat.java

# 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
PLATFORM_VERSION.OPM1 := 8.1.0

# etc....