Merge "Make the language version selection smarter"

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## Java version

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# Use the LOCAL_JAVA_LANGUAGE_VERSION if it is set, otherwise

# use one based on the LOCAL_SDK_VERSION. If it is < 24

# pass "1.7" to the tools, if it is unset, >= 24 or "current"

# pass "1.8".

#

# The LOCAL_SDK_VERSION behavior is to ensure that, by default,

# code that is expected to run on older releases of Android

# does not use any 1.8 language features that are not supported

# on earlier runtimes (like default / static interface methods).

# Modules can override this logic by specifying

# LOCAL_JAVA_LANGUAGE_VERSION explicitly.

ifeq (,$(LOCAL_JAVA_LANGUAGE_VERSION))

  private_sdk_versions_without_any_java_18_support := 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

  ifneq (,$(filter $(LOCAL_SDK_VERSION), $(private_sdk_versions_without_any_java_18_support)))

    LOCAL_JAVA_LANGUAGE_VERSION := 1.7

  else

    # This retains 1.7 for ART build bots only. http://b/27583810

    ifeq (,$(LEGACY_USE_JAVA7))

      LOCAL_JAVA_LANGUAGE_VERSION := 1.8

    else

      LOCAL_JAVA_LANGUAGE_VERSION := 1.7

    endif

  endif

endif

LOCAL_JAVACFLAGS += -source $(LOCAL_JAVA_LANGUAGE_VERSION) -target $(LOCAL_JAVA_LANGUAGE_VERSION)

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