common/autoconf/boot-jdk.m4 - platform/libcore - Gitiles

 #
 # Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License version 2 only, as
 # published by the Free Software Foundation.  Oracle designates this
 # particular file as subject to the "Classpath" exception as provided
 # by Oracle in the LICENSE file that accompanied this code.
 #
 # This code is distributed in the hope that it will be useful, but WITHOUT
 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 # version 2 for more details (a copy is included in the LICENSE file that
 # accompanied this code).
 #
 # You should have received a copy of the GNU General Public License version
 # 2 along with this work; if not, write to the Free Software Foundation,
 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 #
 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 # or visit www.oracle.com if you need additional information or have any
 # questions.
 #

 ########################################################################
 # This file handles detection of the Boot JDK. The Boot JDK detection
 # process has been developed as a response to solve a complex real-world
 # problem. Initially, it was simple, but it has grown as platform after
 # platform, idiosyncracy after idiosyncracy has been supported.
 #
 # The basic idea is this:
 # 1) You need an acceptable *) JDK to use as a Boot JDK
 # 2) There are several ways to locate a JDK, that are mostly platform
 #    dependent **)
 # 3) You can have multiple JDKs installed
 # 4) If possible, configure should try to dig out an acceptable JDK
 #    automatically, without having to resort to command-line options
 #
 # *)  acceptable means e.g. JDK7 for building JDK8, a complete JDK (with
 #     javac) and not a JRE, etc.
 #
 # **) On Windows we typically use a well-known path.
 #     On MacOSX we typically use the tool java_home.
 #     On Linux we typically find javac in the $PATH, and then follow a
 #     chain of symlinks that often ends up in a real JDK.
 #
 # This leads to the code where we check in different ways to locate a
 # JDK, and if one is found, check if it is acceptable. If not, we print
 # our reasons for rejecting it (useful when debugging non-working
 # configure situations) and continue checking the next one.
 ########################################################################

 # Execute the check given as argument, and verify the result
 # If the Boot JDK was previously found, do nothing
 # $1 A command line (typically autoconf macro) to execute
 AC_DEFUN([BOOTJDK_DO_CHECK],
 [
   if test "x$BOOT_JDK_FOUND" = xno; then
     # Now execute the test
     $1

     # If previous step claimed to have found a JDK, check it to see if it seems to be valid.
     if test "x$BOOT_JDK_FOUND" = xmaybe; then
       # Do we have a bin/java?
       if test ! -x "$BOOT_JDK/bin/java"; then
         AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/java; ignoring])
         BOOT_JDK_FOUND=no
       else
         # Do we have a bin/javac?
         if test ! -x "$BOOT_JDK/bin/javac"; then
           AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/javac; ignoring])
           AC_MSG_NOTICE([(This might be an JRE instead of an JDK)])
           BOOT_JDK_FOUND=no
         else
           # Do we have an rt.jar? (On MacOSX it is called classes.jar)
           if test ! -f "$BOOT_JDK/jre/lib/rt.jar" && test ! -f "$BOOT_JDK/../Classes/classes.jar"; then
             AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain an rt.jar; ignoring])
             BOOT_JDK_FOUND=no
           else
             # Oh, this is looking good! We probably have found a proper JDK. Is it the correct version?
             BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 | head -n 1`

             # Extra M4 quote needed to protect [] in grep expression.
             [FOUND_CORRECT_VERSION=`echo $BOOT_JDK_VERSION | grep  '\"1\.[89]\.'`]
             if test "x$FOUND_CORRECT_VERSION" = x; then
               AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK is incorrect JDK version ($BOOT_JDK_VERSION); ignoring])
               AC_MSG_NOTICE([(Your Boot JDK must be version 8 or 9)])
               BOOT_JDK_FOUND=no
             else
               # We're done! :-)
               BOOT_JDK_FOUND=yes
               BASIC_FIXUP_PATH(BOOT_JDK)
               AC_MSG_CHECKING([for Boot JDK])
               AC_MSG_RESULT([$BOOT_JDK])
               AC_MSG_CHECKING([Boot JDK version])
               BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 | $TR '\n\r' '  '`
               AC_MSG_RESULT([$BOOT_JDK_VERSION])
             fi # end check jdk version
           fi # end check rt.jar
         fi # end check javac
       fi # end check java
     fi # end check boot jdk found
   fi
 ])

 # Test: Is bootjdk explicitely set by command line arguments?
 AC_DEFUN([BOOTJDK_CHECK_ARGUMENTS],
 [
   if test "x$with_boot_jdk" != x; then
     BOOT_JDK=$with_boot_jdk
     BOOT_JDK_FOUND=maybe
     AC_MSG_NOTICE([Found potential Boot JDK using configure arguments])
   fi
 ])

 # Test: Is bootjdk available from builddeps?
 AC_DEFUN([BOOTJDK_CHECK_BUILDDEPS],
 [
   BDEPS_CHECK_MODULE(BOOT_JDK, bootjdk, xxx, [BOOT_JDK_FOUND=maybe], [BOOT_JDK_FOUND=no])
 ])

 # Test: Is $JAVA_HOME set?
 AC_DEFUN([BOOTJDK_CHECK_JAVA_HOME],
 [
   if test "x$JAVA_HOME" != x; then
     JAVA_HOME_PROCESSED="$JAVA_HOME"
     BASIC_FIXUP_PATH(JAVA_HOME_PROCESSED)
     if test ! -d "$JAVA_HOME_PROCESSED"; then
       AC_MSG_NOTICE([Your JAVA_HOME points to a non-existing directory!])
     else
       # Aha, the user has set a JAVA_HOME
       # let us use that as the Boot JDK.
       BOOT_JDK="$JAVA_HOME_PROCESSED"
       BOOT_JDK_FOUND=maybe
       AC_MSG_NOTICE([Found potential Boot JDK using JAVA_HOME])
     fi
   fi
 ])

 # Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
 AC_DEFUN([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK],
 [
   AC_PATH_PROG(JAVAC_CHECK, javac)
   AC_PATH_PROG(JAVA_CHECK, java)
   BINARY="$JAVAC_CHECK"
   if test "x$JAVAC_CHECK" = x; then
     BINARY="$JAVA_CHECK"
   fi
   if test "x$BINARY" != x; then
     # So there is a java(c) binary, it might be part of a JDK.
     # Lets find the JDK/JRE directory by following symbolic links.
     # Linux/GNU systems often have links from /usr/bin/java to
     # /etc/alternatives/java to the real JDK binary.
     BASIC_REMOVE_SYMBOLIC_LINKS(BINARY)
     BOOT_JDK=`dirname "$BINARY"`
     BOOT_JDK=`cd "$BOOT_JDK/.."; pwd`
     if test -x "$BOOT_JDK/bin/javac" && test -x "$BOOT_JDK/bin/java"; then
       # Looks like we found ourselves an JDK
       BOOT_JDK_FOUND=maybe
       AC_MSG_NOTICE([Found potential Boot JDK using java(c) in PATH])
     fi
   fi
 ])

 # Test: Is there a /usr/libexec/java_home? (Typically on MacOSX)
 # $1: Argument to the java_home binary (optional)
 AC_DEFUN([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME],
 [
   if test -x /usr/libexec/java_home; then
     BOOT_JDK=`/usr/libexec/java_home $1`
     BOOT_JDK_FOUND=maybe
     AC_MSG_NOTICE([Found potential Boot JDK using /usr/libexec/java_home $1])
   fi
 ])

 # Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
 AC_DEFUN([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR],
 [
   if test "x$OPENJDK_TARGET_OS" = xmacosx; then
     # First check at user selected default
     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME()])
     # If that did not work out (e.g. too old), try explicit versions instead
     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.9])])
     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.8])])
     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.7])])
   fi
 ])

 # Look for a jdk in the given path. If there are multiple, try to select the newest.
 # If found, set BOOT_JDK and BOOT_JDK_FOUND.
 # $1 = Path to directory containing jdk installations.
 # $2 = String to append to the found JDK directory to get the proper JDK home
 AC_DEFUN([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY],
 [
   BOOT_JDK_PREFIX="$1"
   BOOT_JDK_SUFFIX="$2"
   ALL_JDKS_FOUND=`$LS "$BOOT_JDK_PREFIX" 2> /dev/null | $SORT -r`
   if test "x$ALL_JDKS_FOUND" != x; then
     for JDK_TO_TRY in $ALL_JDKS_FOUND ; do
       BOOTJDK_DO_CHECK([
         BOOT_JDK="${BOOT_JDK_PREFIX}/${JDK_TO_TRY}${BOOT_JDK_SUFFIX}"
         if test -d "$BOOT_JDK"; then
           BOOT_JDK_FOUND=maybe
           AC_MSG_NOTICE([Found potential Boot JDK using well-known locations (in $BOOT_JDK_PREFIX/$JDK_TO_TRY)])
         fi
       ])
     done
   fi
 ])

 # Call BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY, but use the given
 # environmental variable as base for where to look.
 # $1 Name of an environmal variable, assumed to point to the Program Files directory.
 AC_DEFUN([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY],
 [
   if test "x[$]$1" != x; then
     VIRTUAL_DIR="[$]$1/Java"
     BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(VIRTUAL_DIR)
     BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY($VIRTUAL_DIR)
   fi
 ])

 # Test: Is there a JDK installed in default, well-known locations?
 AC_DEFUN([BOOTJDK_CHECK_WELL_KNOWN_LOCATIONS],
 [
   if test "x$OPENJDK_TARGET_OS" = xwindows; then
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([ProgramW6432])])
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([PROGRAMW6432])])
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([PROGRAMFILES])])
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([ProgramFiles])])
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/cygdrive/c/Program Files/Java])])
   elif test "x$OPENJDK_TARGET_OS" = xmacosx; then
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/Library/Java/JavaVirtualMachines],[/Contents/Home])])
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/System/Library/Java/JavaVirtualMachines],[/Contents/Home])])
   elif test "x$OPENJDK_TARGET_OS" = xlinux; then
     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/usr/lib/jvm])])
   fi
 ])

 # Check that a command-line tool in the Boot JDK is correct
 # $1 = name of variable to assign
 # $2 = name of binary
 AC_DEFUN([BOOTJDK_CHECK_TOOL_IN_BOOTJDK],
 [
   # Use user overridden value if available, otherwise locate tool in the Boot JDK.
   BASIC_SETUP_TOOL($1,
     [
       AC_MSG_CHECKING([for $2 in Boot JDK])
       $1=$BOOT_JDK/bin/$2
       if test ! -x [$]$1; then
         AC_MSG_RESULT(not found)
         AC_MSG_NOTICE([Your Boot JDK seems broken. This might be fixed by explicitely setting --with-boot-jdk])
         AC_MSG_ERROR([Could not find $2 in the Boot JDK])
       fi
       AC_MSG_RESULT(ok)
       AC_SUBST($1)
     ])
 ])

 ###############################################################################
 #
 # We need a Boot JDK to bootstrap the build.
 #

 AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],
 [
   BOOT_JDK_FOUND=no
   AC_ARG_WITH(boot-jdk, [AS_HELP_STRING([--with-boot-jdk],
       [path to Boot JDK (used to bootstrap build) @<:@probed@:>@])])

   # We look for the Boot JDK through various means, going from more certain to
   # more of a guess-work. After each test, BOOT_JDK_FOUND is set to "yes" if
   # we detected something (if so, the path to the jdk is in BOOT_JDK). But we
   # must check if this is indeed valid; otherwise we'll continue looking.

   # Test: Is bootjdk explicitely set by command line arguments?
   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_ARGUMENTS])
   if test "x$with_boot_jdk" != x && test "x$BOOT_JDK_FOUND" = xno; then
     # Having specified an argument which is incorrect will produce an instant failure;
     # we should not go on looking
     AC_MSG_ERROR([The path given by --with-boot-jdk does not contain a valid Boot JDK])
   fi

   # Test: Is bootjdk available from builddeps?
   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_BUILDDEPS])

   # Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR])

   # Test: Is $JAVA_HOME set?
   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_HOME])

   # Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK])

   # Test: Is there a JDK installed in default, well-known locations?
   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_WELL_KNOWN_LOCATIONS])

   # If we haven't found anything yet, we've truly lost. Give up.
   if test "x$BOOT_JDK_FOUND" = xno; then
     HELP_MSG_MISSING_DEPENDENCY([openjdk])
     AC_MSG_NOTICE([Could not find a valid Boot JDK. $HELP_MSG])
     AC_MSG_NOTICE([This might be fixed by explicitely setting --with-boot-jdk])
     AC_MSG_ERROR([Cannot continue])
   fi

   # Setup proper paths for what we found
   BOOT_RTJAR="$BOOT_JDK/jre/lib/rt.jar"
   if test ! -f "$BOOT_RTJAR"; then
     # On MacOSX it is called classes.jar
     BOOT_RTJAR="$BOOT_JDK/../Classes/classes.jar"
     if test -f "$BOOT_RTJAR"; then
       # Remove the ..
       BOOT_RTJAR="`cd ${BOOT_RTJAR%/*} && pwd`/${BOOT_RTJAR##*/}"
     fi
   fi
   BOOT_TOOLSJAR="$BOOT_JDK/lib/tools.jar"
   BOOT_JDK="$BOOT_JDK"
   AC_SUBST(BOOT_RTJAR)
   AC_SUBST(BOOT_TOOLSJAR)
   AC_SUBST(BOOT_JDK)

   # Setup tools from the Boot JDK.
   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVA, java)
   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVAC, javac)
   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVAH, javah)
   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAR, jar)
   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(NATIVE2ASCII, native2ascii)
   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JARSIGNER, jarsigner)

   # Finally, set some other options...

   # When compiling code to be executed by the Boot JDK, force jdk7 compatibility.
   BOOT_JDK_SOURCETARGET="-source 7 -target 7"
   AC_SUBST(BOOT_JDK_SOURCETARGET)
   AC_SUBST(JAVAC_FLAGS)
 ])

 AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK_ARGUMENTS],
 [
   ##############################################################################
   #
   # Specify jvm options for anything that is run with the Boot JDK.
   # Not all JVM:s accept the same arguments on the command line.
   #
   AC_ARG_WITH(boot-jdk-jvmargs, [AS_HELP_STRING([--with-boot-jdk-jvmargs],
   [specify JVM arguments to be passed to all java invocations of boot JDK, overriding the default values,
   e.g --with-boot-jdk-jvmargs="-Xmx8G -enableassertions"])])

   AC_MSG_CHECKING([flags for boot jdk java command] )

   # Disable special log output when a debug build is used as Boot JDK...
   ADD_JVM_ARG_IF_OK([-XX:-PrintVMOptions -XX:-UnlockDiagnosticVMOptions -XX:-LogVMOutput],boot_jdk_jvmargs,[$JAVA])

   # Apply user provided options.
   ADD_JVM_ARG_IF_OK([$with_boot_jdk_jvmargs],boot_jdk_jvmargs,[$JAVA])

   AC_MSG_RESULT([$boot_jdk_jvmargs])

   # For now, general JAVA_FLAGS are the same as the boot jdk jvmargs
   JAVA_FLAGS=$boot_jdk_jvmargs
   AC_SUBST(JAVA_FLAGS)


   AC_MSG_CHECKING([flags for boot jdk java command for big workloads])

   # Starting amount of heap memory.
   ADD_JVM_ARG_IF_OK([-Xms64M],boot_jdk_jvmargs_big,[$JAVA])

   # Maximum amount of heap memory.
   # Maximum stack size.
   if test "x$BUILD_NUM_BITS" = x32; then
     JVM_MAX_HEAP=1100M
     STACK_SIZE=768
   else
     # Running Javac on a JVM on a 64-bit machine, takes more space since 64-bit
     # pointers are used. Apparently, we need to increase the heap and stack
     # space for the jvm. More specifically, when running javac to build huge
     # jdk batch
     JVM_MAX_HEAP=1600M
     STACK_SIZE=1536
   fi
   ADD_JVM_ARG_IF_OK([-Xmx$JVM_MAX_HEAP],boot_jdk_jvmargs_big,[$JAVA])
   ADD_JVM_ARG_IF_OK([-XX:ThreadStackSize=$STACK_SIZE],boot_jdk_jvmargs_big,[$JAVA])

   AC_MSG_RESULT([$boot_jdk_jvmargs_big])

   JAVA_FLAGS_BIG=$boot_jdk_jvmargs_big
   AC_SUBST(JAVA_FLAGS_BIG)


   AC_MSG_CHECKING([flags for boot jdk java command for small workloads])

   # Use serial gc for small short lived tools if possible
   ADD_JVM_ARG_IF_OK([-XX:+UseSerialGC],boot_jdk_jvmargs_small,[$JAVA])
   ADD_JVM_ARG_IF_OK([-Xms32M],boot_jdk_jvmargs_small,[$JAVA])
   ADD_JVM_ARG_IF_OK([-Xmx512M],boot_jdk_jvmargs_small,[$JAVA])

   AC_MSG_RESULT([$boot_jdk_jvmargs_small])

   JAVA_FLAGS_SMALL=$boot_jdk_jvmargs_small
   AC_SUBST(JAVA_FLAGS_SMALL)
 ])
	#
	# Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
	# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	#
	# This code is free software; you can redistribute it and/or modify it
	# under the terms of the GNU General Public License version 2 only, as
	# published by the Free Software Foundation. Oracle designates this
	# particular file as subject to the "Classpath" exception as provided
	# by Oracle in the LICENSE file that accompanied this code.
	#
	# This code is distributed in the hope that it will be useful, but WITHOUT
	# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	# version 2 for more details (a copy is included in the LICENSE file that
	# accompanied this code).
	#
	# You should have received a copy of the GNU General Public License version
	# 2 along with this work; if not, write to the Free Software Foundation,
	# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	#
	# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	# or visit www.oracle.com if you need additional information or have any
	# questions.
	#

	########################################################################
	# This file handles detection of the Boot JDK. The Boot JDK detection
	# process has been developed as a response to solve a complex real-world
	# problem. Initially, it was simple, but it has grown as platform after
	# platform, idiosyncracy after idiosyncracy has been supported.
	#
	# The basic idea is this:
	# 1) You need an acceptable *) JDK to use as a Boot JDK
	# 2) There are several ways to locate a JDK, that are mostly platform
	# dependent **)
	# 3) You can have multiple JDKs installed
	# 4) If possible, configure should try to dig out an acceptable JDK
	# automatically, without having to resort to command-line options
	#
	# *) acceptable means e.g. JDK7 for building JDK8, a complete JDK (with
	# javac) and not a JRE, etc.
	#
	# **) On Windows we typically use a well-known path.
	# On MacOSX we typically use the tool java_home.
	# On Linux we typically find javac in the $PATH, and then follow a
	# chain of symlinks that often ends up in a real JDK.
	#
	# This leads to the code where we check in different ways to locate a
	# JDK, and if one is found, check if it is acceptable. If not, we print
	# our reasons for rejecting it (useful when debugging non-working
	# configure situations) and continue checking the next one.
	########################################################################

	# Execute the check given as argument, and verify the result
	# If the Boot JDK was previously found, do nothing
	# $1 A command line (typically autoconf macro) to execute
	AC_DEFUN([BOOTJDK_DO_CHECK],
	[
	if test "x$BOOT_JDK_FOUND" = xno; then
	# Now execute the test
	$1

	# If previous step claimed to have found a JDK, check it to see if it seems to be valid.
	if test "x$BOOT_JDK_FOUND" = xmaybe; then
	# Do we have a bin/java?
	if test ! -x "$BOOT_JDK/bin/java"; then
	AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/java; ignoring])
	BOOT_JDK_FOUND=no
	else
	# Do we have a bin/javac?
	if test ! -x "$BOOT_JDK/bin/javac"; then
	AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/javac; ignoring])
	AC_MSG_NOTICE([(This might be an JRE instead of an JDK)])
	BOOT_JDK_FOUND=no
	else
	# Do we have an rt.jar? (On MacOSX it is called classes.jar)
	if test ! -f "$BOOT_JDK/jre/lib/rt.jar" && test ! -f "$BOOT_JDK/../Classes/classes.jar"; then
	AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain an rt.jar; ignoring])
	BOOT_JDK_FOUND=no
	else
	# Oh, this is looking good! We probably have found a proper JDK. Is it the correct version?
	BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 \| head -n 1`

	# Extra M4 quote needed to protect [] in grep expression.
	[FOUND_CORRECT_VERSION=`echo $BOOT_JDK_VERSION \| grep '\"1\.[89]\.'`]
	if test "x$FOUND_CORRECT_VERSION" = x; then
	AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK is incorrect JDK version ($BOOT_JDK_VERSION); ignoring])
	AC_MSG_NOTICE([(Your Boot JDK must be version 8 or 9)])
	BOOT_JDK_FOUND=no
	else
	# We're done! :-)
	BOOT_JDK_FOUND=yes
	BASIC_FIXUP_PATH(BOOT_JDK)
	AC_MSG_CHECKING([for Boot JDK])
	AC_MSG_RESULT([$BOOT_JDK])
	AC_MSG_CHECKING([Boot JDK version])
	BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 \| $TR '\n\r' ' '`
	AC_MSG_RESULT([$BOOT_JDK_VERSION])
	fi # end check jdk version
	fi # end check rt.jar
	fi # end check javac
	fi # end check java
	fi # end check boot jdk found
	fi
	])

	# Test: Is bootjdk explicitely set by command line arguments?
	AC_DEFUN([BOOTJDK_CHECK_ARGUMENTS],
	[
	if test "x$with_boot_jdk" != x; then
	BOOT_JDK=$with_boot_jdk
	BOOT_JDK_FOUND=maybe
	AC_MSG_NOTICE([Found potential Boot JDK using configure arguments])
	fi
	])

	# Test: Is bootjdk available from builddeps?
	AC_DEFUN([BOOTJDK_CHECK_BUILDDEPS],
	[
	BDEPS_CHECK_MODULE(BOOT_JDK, bootjdk, xxx, [BOOT_JDK_FOUND=maybe], [BOOT_JDK_FOUND=no])
	])

	# Test: Is $JAVA_HOME set?
	AC_DEFUN([BOOTJDK_CHECK_JAVA_HOME],
	[
	if test "x$JAVA_HOME" != x; then
	JAVA_HOME_PROCESSED="$JAVA_HOME"
	BASIC_FIXUP_PATH(JAVA_HOME_PROCESSED)
	if test ! -d "$JAVA_HOME_PROCESSED"; then
	AC_MSG_NOTICE([Your JAVA_HOME points to a non-existing directory!])
	else
	# Aha, the user has set a JAVA_HOME
	# let us use that as the Boot JDK.
	BOOT_JDK="$JAVA_HOME_PROCESSED"
	BOOT_JDK_FOUND=maybe
	AC_MSG_NOTICE([Found potential Boot JDK using JAVA_HOME])
	fi
	fi
	])

	# Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
	AC_DEFUN([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK],
	[
	AC_PATH_PROG(JAVAC_CHECK, javac)
	AC_PATH_PROG(JAVA_CHECK, java)
	BINARY="$JAVAC_CHECK"
	if test "x$JAVAC_CHECK" = x; then
	BINARY="$JAVA_CHECK"
	fi
	if test "x$BINARY" != x; then
	# So there is a java(c) binary, it might be part of a JDK.
	# Lets find the JDK/JRE directory by following symbolic links.
	# Linux/GNU systems often have links from /usr/bin/java to
	# /etc/alternatives/java to the real JDK binary.
	BASIC_REMOVE_SYMBOLIC_LINKS(BINARY)
	BOOT_JDK=`dirname "$BINARY"`
	BOOT_JDK=`cd "$BOOT_JDK/.."; pwd`
	if test -x "$BOOT_JDK/bin/javac" && test -x "$BOOT_JDK/bin/java"; then
	# Looks like we found ourselves an JDK
	BOOT_JDK_FOUND=maybe
	AC_MSG_NOTICE([Found potential Boot JDK using java(c) in PATH])
	fi
	fi
	])

	# Test: Is there a /usr/libexec/java_home? (Typically on MacOSX)
	# $1: Argument to the java_home binary (optional)
	AC_DEFUN([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME],
	[
	if test -x /usr/libexec/java_home; then
	BOOT_JDK=`/usr/libexec/java_home $1`
	BOOT_JDK_FOUND=maybe
	AC_MSG_NOTICE([Found potential Boot JDK using /usr/libexec/java_home $1])
	fi
	])

	# Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
	AC_DEFUN([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR],
	[
	if test "x$OPENJDK_TARGET_OS" = xmacosx; then
	# First check at user selected default
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME()])
	# If that did not work out (e.g. too old), try explicit versions instead
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.9])])
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.8])])
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.7])])
	fi
	])

	# Look for a jdk in the given path. If there are multiple, try to select the newest.
	# If found, set BOOT_JDK and BOOT_JDK_FOUND.
	# $1 = Path to directory containing jdk installations.
	# $2 = String to append to the found JDK directory to get the proper JDK home
	AC_DEFUN([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY],
	[
	BOOT_JDK_PREFIX="$1"
	BOOT_JDK_SUFFIX="$2"
	ALL_JDKS_FOUND=`$LS "$BOOT_JDK_PREFIX" 2> /dev/null \| $SORT -r`
	if test "x$ALL_JDKS_FOUND" != x; then
	for JDK_TO_TRY in $ALL_JDKS_FOUND ; do
	BOOTJDK_DO_CHECK([
	BOOT_JDK="${BOOT_JDK_PREFIX}/${JDK_TO_TRY}${BOOT_JDK_SUFFIX}"
	if test -d "$BOOT_JDK"; then
	BOOT_JDK_FOUND=maybe
	AC_MSG_NOTICE([Found potential Boot JDK using well-known locations (in $BOOT_JDK_PREFIX/$JDK_TO_TRY)])
	fi
	])
	done
	fi
	])

	# Call BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY, but use the given
	# environmental variable as base for where to look.
	# $1 Name of an environmal variable, assumed to point to the Program Files directory.
	AC_DEFUN([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY],
	[
	if test "x[$]$1" != x; then
	VIRTUAL_DIR="[$]$1/Java"
	BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(VIRTUAL_DIR)
	BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY($VIRTUAL_DIR)
	fi
	])

	# Test: Is there a JDK installed in default, well-known locations?
	AC_DEFUN([BOOTJDK_CHECK_WELL_KNOWN_LOCATIONS],
	[
	if test "x$OPENJDK_TARGET_OS" = xwindows; then
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([ProgramW6432])])
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([PROGRAMW6432])])
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([PROGRAMFILES])])
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([ProgramFiles])])
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/cygdrive/c/Program Files/Java])])
	elif test "x$OPENJDK_TARGET_OS" = xmacosx; then
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/Library/Java/JavaVirtualMachines],[/Contents/Home])])
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/System/Library/Java/JavaVirtualMachines],[/Contents/Home])])
	elif test "x$OPENJDK_TARGET_OS" = xlinux; then
	BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/usr/lib/jvm])])
	fi
	])

	# Check that a command-line tool in the Boot JDK is correct
	# $1 = name of variable to assign
	# $2 = name of binary
	AC_DEFUN([BOOTJDK_CHECK_TOOL_IN_BOOTJDK],
	[
	# Use user overridden value if available, otherwise locate tool in the Boot JDK.
	BASIC_SETUP_TOOL($1,
	[
	AC_MSG_CHECKING([for $2 in Boot JDK])
	$1=$BOOT_JDK/bin/$2
	if test ! -x [$]$1; then
	AC_MSG_RESULT(not found)
	AC_MSG_NOTICE([Your Boot JDK seems broken. This might be fixed by explicitely setting --with-boot-jdk])
	AC_MSG_ERROR([Could not find $2 in the Boot JDK])
	fi
	AC_MSG_RESULT(ok)
	AC_SUBST($1)
	])
	])

	###############################################################################
	#
	# We need a Boot JDK to bootstrap the build.
	#

	AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],
	[
	BOOT_JDK_FOUND=no
	AC_ARG_WITH(boot-jdk, [AS_HELP_STRING([--with-boot-jdk],
	[path to Boot JDK (used to bootstrap build) @<:@probed@:>@])])

	# We look for the Boot JDK through various means, going from more certain to
	# more of a guess-work. After each test, BOOT_JDK_FOUND is set to "yes" if
	# we detected something (if so, the path to the jdk is in BOOT_JDK). But we
	# must check if this is indeed valid; otherwise we'll continue looking.

	# Test: Is bootjdk explicitely set by command line arguments?
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_ARGUMENTS])
	if test "x$with_boot_jdk" != x && test "x$BOOT_JDK_FOUND" = xno; then
	# Having specified an argument which is incorrect will produce an instant failure;
	# we should not go on looking
	AC_MSG_ERROR([The path given by --with-boot-jdk does not contain a valid Boot JDK])
	fi

	# Test: Is bootjdk available from builddeps?
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_BUILDDEPS])

	# Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR])

	# Test: Is $JAVA_HOME set?
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_HOME])

	# Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK])

	# Test: Is there a JDK installed in default, well-known locations?
	BOOTJDK_DO_CHECK([BOOTJDK_CHECK_WELL_KNOWN_LOCATIONS])

	# If we haven't found anything yet, we've truly lost. Give up.
	if test "x$BOOT_JDK_FOUND" = xno; then
	HELP_MSG_MISSING_DEPENDENCY([openjdk])
	AC_MSG_NOTICE([Could not find a valid Boot JDK. $HELP_MSG])
	AC_MSG_NOTICE([This might be fixed by explicitely setting --with-boot-jdk])
	AC_MSG_ERROR([Cannot continue])
	fi

	# Setup proper paths for what we found
	BOOT_RTJAR="$BOOT_JDK/jre/lib/rt.jar"
	if test ! -f "$BOOT_RTJAR"; then
	# On MacOSX it is called classes.jar
	BOOT_RTJAR="$BOOT_JDK/../Classes/classes.jar"
	if test -f "$BOOT_RTJAR"; then
	# Remove the ..
	BOOT_RTJAR="`cd ${BOOT_RTJAR%/} && pwd`/${BOOT_RTJAR##/}"
	fi
	fi
	BOOT_TOOLSJAR="$BOOT_JDK/lib/tools.jar"
	BOOT_JDK="$BOOT_JDK"
	AC_SUBST(BOOT_RTJAR)
	AC_SUBST(BOOT_TOOLSJAR)
	AC_SUBST(BOOT_JDK)

	# Setup tools from the Boot JDK.
	BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVA, java)
	BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVAC, javac)
	BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVAH, javah)
	BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAR, jar)
	BOOTJDK_CHECK_TOOL_IN_BOOTJDK(NATIVE2ASCII, native2ascii)
	BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JARSIGNER, jarsigner)

	# Finally, set some other options...

	# When compiling code to be executed by the Boot JDK, force jdk7 compatibility.
	BOOT_JDK_SOURCETARGET="-source 7 -target 7"
	AC_SUBST(BOOT_JDK_SOURCETARGET)
	AC_SUBST(JAVAC_FLAGS)
	])

	AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK_ARGUMENTS],
	[
	##############################################################################
	#
	# Specify jvm options for anything that is run with the Boot JDK.
	# Not all JVM:s accept the same arguments on the command line.
	#
	AC_ARG_WITH(boot-jdk-jvmargs, [AS_HELP_STRING([--with-boot-jdk-jvmargs],
	[specify JVM arguments to be passed to all java invocations of boot JDK, overriding the default values,
	e.g --with-boot-jdk-jvmargs="-Xmx8G -enableassertions"])])

	AC_MSG_CHECKING([flags for boot jdk java command] )

	# Disable special log output when a debug build is used as Boot JDK...
	ADD_JVM_ARG_IF_OK([-XX:-PrintVMOptions -XX:-UnlockDiagnosticVMOptions -XX:-LogVMOutput],boot_jdk_jvmargs,[$JAVA])

	# Apply user provided options.
	ADD_JVM_ARG_IF_OK([$with_boot_jdk_jvmargs],boot_jdk_jvmargs,[$JAVA])

	AC_MSG_RESULT([$boot_jdk_jvmargs])

	# For now, general JAVA_FLAGS are the same as the boot jdk jvmargs
	JAVA_FLAGS=$boot_jdk_jvmargs
	AC_SUBST(JAVA_FLAGS)


	AC_MSG_CHECKING([flags for boot jdk java command for big workloads])

	# Starting amount of heap memory.
	ADD_JVM_ARG_IF_OK([-Xms64M],boot_jdk_jvmargs_big,[$JAVA])

	# Maximum amount of heap memory.
	# Maximum stack size.
	if test "x$BUILD_NUM_BITS" = x32; then
	JVM_MAX_HEAP=1100M
	STACK_SIZE=768
	else
	# Running Javac on a JVM on a 64-bit machine, takes more space since 64-bit
	# pointers are used. Apparently, we need to increase the heap and stack
	# space for the jvm. More specifically, when running javac to build huge
	# jdk batch
	JVM_MAX_HEAP=1600M
	STACK_SIZE=1536
	fi
	ADD_JVM_ARG_IF_OK([-Xmx$JVM_MAX_HEAP],boot_jdk_jvmargs_big,[$JAVA])
	ADD_JVM_ARG_IF_OK([-XX:ThreadStackSize=$STACK_SIZE],boot_jdk_jvmargs_big,[$JAVA])

	AC_MSG_RESULT([$boot_jdk_jvmargs_big])

	JAVA_FLAGS_BIG=$boot_jdk_jvmargs_big
	AC_SUBST(JAVA_FLAGS_BIG)


	AC_MSG_CHECKING([flags for boot jdk java command for small workloads])

	# Use serial gc for small short lived tools if possible
	ADD_JVM_ARG_IF_OK([-XX:+UseSerialGC],boot_jdk_jvmargs_small,[$JAVA])
	ADD_JVM_ARG_IF_OK([-Xms32M],boot_jdk_jvmargs_small,[$JAVA])
	ADD_JVM_ARG_IF_OK([-Xmx512M],boot_jdk_jvmargs_small,[$JAVA])

	AC_MSG_RESULT([$boot_jdk_jvmargs_small])

	JAVA_FLAGS_SMALL=$boot_jdk_jvmargs_small
	AC_SUBST(JAVA_FLAGS_SMALL)
	])