Merge "Add OpenJDK 8 experimental support"

java_version_str := $(shell unset _JAVA_OPTIONS && java -version 2>&1)

javac_version_str := $(shell unset _JAVA_OPTIONS && javac -version 2>&1)

# Check for the correct version of java.

# Check for the correct version of java, should be 1.7 by

# default, and 1.8 if EXPERIMENTAL_USE_JAVA8 is set

ifneq ($(EXPERIMENTAL_USE_JAVA8),)

required_version := "1.8.x"

required_javac_version := "1.8"

java_version := $(shell echo '$(java_version_str)' | grep 'openjdk .*[ "]1\.8[\. "$$]')

javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.8[\. "$$]')

else # default

required_version := "1.7.x"

required_javac_version := "1.7"

java_version := $(shell echo '$(java_version_str)' | grep '^java .*[ "]1\.7[\. "$$]')

javac_version := $(shell echo '$(javac_version_str)' | grep '[ "]1\.7[\. "$$]')

endif # if EXPERIMENTAL_USE_JAVA8

ifeq ($(strip $(java_version)),)

$(info ************************************************************)