1 #
   2 # Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
   3 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4 #
   5 # This code is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License version 2 only, as
   7 # published by the Free Software Foundation.  Oracle designates this
   8 # particular file as subject to the "Classpath" exception as provided
   9 # by Oracle in the LICENSE file that accompanied this code.
  10 #
  11 # This code is distributed in the hope that it will be useful, but WITHOUT
  12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 # version 2 for more details (a copy is included in the LICENSE file that
  15 # accompanied this code).
  16 #
  17 # You should have received a copy of the GNU General Public License version
  18 # 2 along with this work; if not, write to the Free Software Foundation,
  19 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20 #
  21 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22 # or visit www.oracle.com if you need additional information or have any
  23 # questions.
  24 #
  25 
  26 ########################################################################
  27 # This file handles detection of the Boot JDK. The Boot JDK detection
  28 # process has been developed as a response to solve a complex real-world
  29 # problem. Initially, it was simple, but it has grown as platform after
  30 # platform, idiosyncracy after idiosyncracy has been supported.
  31 #
  32 # The basic idea is this:
  33 # 1) You need an acceptable *) JDK to use as a Boot JDK
  34 # 2) There are several ways to locate a JDK, that are mostly platform
  35 #    dependent **)
  36 # 3) You can have multiple JDKs installed
  37 # 4) If possible, configure should try to dig out an acceptable JDK
  38 #    automatically, without having to resort to command-line options
  39 #
  40 # *)  acceptable means e.g. JDK7 for building JDK8, a complete JDK (with
  41 #     javac) and not a JRE, etc.
  42 #
  43 # **) On Windows we typically use a well-known path.
  44 #     On MacOSX we typically use the tool java_home.
  45 #     On Linux we typically find javac in the $PATH, and then follow a
  46 #     chain of symlinks that often ends up in a real JDK.
  47 #
  48 # This leads to the code where we check in different ways to locate a
  49 # JDK, and if one is found, check if it is acceptable. If not, we print
  50 # our reasons for rejecting it (useful when debugging non-working
  51 # configure situations) and continue checking the next one.
  52 ########################################################################
  53 
  54 # Execute the check given as argument, and verify the result
  55 # If the Boot JDK was previously found, do nothing
  56 # $1 A command line (typically autoconf macro) to execute
  57 AC_DEFUN([BOOTJDK_DO_CHECK],
  58 [
  59   if test "x$BOOT_JDK_FOUND" = xno; then
  60     # Now execute the test
  61     $1
  62 
  63     # If previous step claimed to have found a JDK, check it to see if it seems to be valid.
  64     if test "x$BOOT_JDK_FOUND" = xmaybe; then
  65       # Do we have a bin/java?
  66       if test ! -x "$BOOT_JDK/bin/java"; then
  67         AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/java; ignoring])
  68         BOOT_JDK_FOUND=no
  69       else
  70         # Do we have a bin/javac?
  71         if test ! -x "$BOOT_JDK/bin/javac"; then
  72           AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/javac; ignoring])
  73           AC_MSG_NOTICE([(This might be an JRE instead of an JDK)])
  74           BOOT_JDK_FOUND=no
  75         else
  76           # Oh, this is looking good! We probably have found a proper JDK. Is it the correct version?
  77           BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 | $HEAD -n 1`
  78 
  79           # Extra M4 quote needed to protect [] in grep expression.
  80           [FOUND_CORRECT_VERSION=`$ECHO $BOOT_JDK_VERSION \
  81               | $EGREP "\"(${DEFAULT_ACCEPTABLE_BOOT_VERSIONS// /|})([\.+-].*)?\""`]
  82           if test "x$FOUND_CORRECT_VERSION" = x; then
  83             AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK is incorrect JDK version ($BOOT_JDK_VERSION); ignoring])
  84             AC_MSG_NOTICE([(Your Boot JDK version must be one of: $DEFAULT_ACCEPTABLE_BOOT_VERSIONS)])
  85             BOOT_JDK_FOUND=no
  86           else
  87             # We're done! :-)
  88             BOOT_JDK_FOUND=yes
  89             BASIC_FIXUP_PATH(BOOT_JDK)
  90             AC_MSG_CHECKING([for Boot JDK])
  91             AC_MSG_RESULT([$BOOT_JDK])
  92             AC_MSG_CHECKING([Boot JDK version])
  93             BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 | $TR '\n\r' '  '`
  94             AC_MSG_RESULT([$BOOT_JDK_VERSION])
  95           fi # end check jdk version
  96         fi # end check javac
  97       fi # end check java
  98     fi # end check boot jdk found
  99   fi
 100 ])
 101 
 102 # Test: Is bootjdk explicitly set by command line arguments?
 103 AC_DEFUN([BOOTJDK_CHECK_ARGUMENTS],
 104 [
 105   if test "x$with_boot_jdk" != x; then
 106     if test -d "$with_boot_jdk"; then
 107       BOOT_JDK=$with_boot_jdk
 108       BOOT_JDK_FOUND=maybe
 109     elif test -f "$with_boot_jdk"; then
 110       case "$with_boot_jdk" in
 111         *.tar.gz )
 112             BOOT_JDK_SUPPORT_DIR=$CONFIGURESUPPORT_OUTPUTDIR/boot-jdk
 113             $RM -rf $BOOT_JDK_SUPPORT_DIR
 114             $MKDIR -p $BOOT_JDK_SUPPORT_DIR
 115             $GUNZIP -c $with_boot_jdk | $TAR xf - -C $BOOT_JDK_SUPPORT_DIR
 116 
 117             # Try to find javac to determine BOOT_JDK path
 118             BOOT_JDK_JAVAC_PATH=`$FIND $BOOT_JDK_SUPPORT_DIR | $GREP "/bin/javac"`
 119             if test "x$BOOT_JDK_JAVAC_PATH" != x; then
 120               BOOT_JDK_FOUND=maybe
 121               BOOT_JDK=$($DIRNAME $($DIRNAME $BOOT_JDK_JAVAC_PATH))
 122             else
 123               BOOT_JDK_FOUND=no
 124             fi
 125           ;;
 126         * )
 127             BOOT_JDK_FOUND=no
 128           ;;
 129       esac
 130     else
 131       BOOT_JDK_FOUND=no
 132     fi
 133     AC_MSG_NOTICE([Found potential Boot JDK using configure arguments])
 134   fi
 135 ])
 136 
 137 # Test: Is $JAVA_HOME set?
 138 AC_DEFUN([BOOTJDK_CHECK_JAVA_HOME],
 139 [
 140   if test "x$JAVA_HOME" != x; then
 141     JAVA_HOME_PROCESSED="$JAVA_HOME"
 142     BASIC_FIXUP_PATH(JAVA_HOME_PROCESSED)
 143     if test ! -d "$JAVA_HOME_PROCESSED"; then
 144       AC_MSG_NOTICE([Your JAVA_HOME points to a non-existing directory!])
 145     else
 146       # Aha, the user has set a JAVA_HOME
 147       # let us use that as the Boot JDK.
 148       BOOT_JDK="$JAVA_HOME_PROCESSED"
 149       BOOT_JDK_FOUND=maybe
 150       AC_MSG_NOTICE([Found potential Boot JDK using JAVA_HOME])
 151     fi
 152   fi
 153 ])
 154 
 155 # Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
 156 AC_DEFUN([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK],
 157 [
 158   AC_PATH_PROG(JAVAC_CHECK, javac)
 159   AC_PATH_PROG(JAVA_CHECK, java)
 160   BINARY="$JAVAC_CHECK"
 161   if test "x$JAVAC_CHECK" = x; then
 162     BINARY="$JAVA_CHECK"
 163   fi
 164   if test "x$BINARY" != x; then
 165     # So there is a java(c) binary, it might be part of a JDK.
 166     # Lets find the JDK/JRE directory by following symbolic links.
 167     # Linux/GNU systems often have links from /usr/bin/java to
 168     # /etc/alternatives/java to the real JDK binary.
 169     BASIC_REMOVE_SYMBOLIC_LINKS(BINARY)
 170     BOOT_JDK=`dirname "$BINARY"`
 171     BOOT_JDK=`cd "$BOOT_JDK/.."; pwd`
 172     if test -x "$BOOT_JDK/bin/javac" && test -x "$BOOT_JDK/bin/java"; then
 173       # Looks like we found ourselves an JDK
 174       BOOT_JDK_FOUND=maybe
 175       AC_MSG_NOTICE([Found potential Boot JDK using java(c) in PATH])
 176     fi
 177   fi
 178 ])
 179 
 180 # Test: Is there a /usr/libexec/java_home? (Typically on MacOSX)
 181 # $1: Argument to the java_home binary (optional)
 182 AC_DEFUN([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME],
 183 [
 184   if test -x /usr/libexec/java_home; then
 185     BOOT_JDK=`/usr/libexec/java_home $1`
 186     BOOT_JDK_FOUND=maybe
 187     AC_MSG_NOTICE([Found potential Boot JDK using /usr/libexec/java_home $1])
 188   fi
 189 ])
 190 
 191 # Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
 192 AC_DEFUN([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR],
 193 [
 194   if test "x$OPENJDK_TARGET_OS" = xmacosx; then
 195     # First check at user selected default
 196     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME()])
 197     # If that did not work out (e.g. too old), try explicit versions instead
 198     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.9])])
 199     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.8])])
 200     BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.7])])
 201   fi
 202 ])
 203 
 204 # Look for a jdk in the given path. If there are multiple, try to select the newest.
 205 # If found, set BOOT_JDK and BOOT_JDK_FOUND.
 206 # $1 = Path to directory containing jdk installations.
 207 # $2 = String to append to the found JDK directory to get the proper JDK home
 208 AC_DEFUN([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY],
 209 [
 210   BOOT_JDK_PREFIX="$1"
 211   BOOT_JDK_SUFFIX="$2"
 212   ALL_JDKS_FOUND=`$LS "$BOOT_JDK_PREFIX" 2> /dev/null | $SORT -r`
 213   if test "x$ALL_JDKS_FOUND" != x; then
 214     for JDK_TO_TRY in $ALL_JDKS_FOUND ; do
 215       BOOTJDK_DO_CHECK([
 216         BOOT_JDK="${BOOT_JDK_PREFIX}/${JDK_TO_TRY}${BOOT_JDK_SUFFIX}"
 217         if test -d "$BOOT_JDK"; then
 218           BOOT_JDK_FOUND=maybe
 219           AC_MSG_NOTICE([Found potential Boot JDK using well-known locations (in $BOOT_JDK_PREFIX/$JDK_TO_TRY)])
 220         fi
 221       ])
 222     done
 223   fi
 224 ])
 225 
 226 # Call BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY, but use the given
 227 # environmental variable as base for where to look.
 228 # $1 Name of an environmal variable, assumed to point to the Program Files directory.
 229 AC_DEFUN([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY],
 230 [
 231   if test "x[$]$1" != x; then
 232     VIRTUAL_DIR="[$]$1/Java"
 233     BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(VIRTUAL_DIR)
 234     BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY($VIRTUAL_DIR)
 235   fi
 236 ])
 237 
 238 # Test: Is there a JDK installed in default, well-known locations?
 239 AC_DEFUN([BOOTJDK_CHECK_WELL_KNOWN_LOCATIONS],
 240 [
 241   if test "x$OPENJDK_TARGET_OS" = xwindows; then
 242     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([ProgramW6432])])
 243     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([PROGRAMW6432])])
 244     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([PROGRAMFILES])])
 245     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY([ProgramFiles])])
 246     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/cygdrive/c/Program Files/Java])])
 247   elif test "x$OPENJDK_TARGET_OS" = xmacosx; then
 248     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/Library/Java/JavaVirtualMachines],[/Contents/Home])])
 249     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/System/Library/Java/JavaVirtualMachines],[/Contents/Home])])
 250   elif test "x$OPENJDK_TARGET_OS" = xlinux; then
 251     BOOTJDK_DO_CHECK([BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY([/usr/lib/jvm])])
 252   fi
 253 ])
 254 
 255 # Check that a command-line tool in the Boot JDK is correct
 256 # $1 = name of variable to assign
 257 # $2 = name of binary
 258 AC_DEFUN([BOOTJDK_CHECK_TOOL_IN_BOOTJDK],
 259 [
 260   # Use user overridden value if available, otherwise locate tool in the Boot JDK.
 261   BASIC_SETUP_TOOL($1,
 262     [
 263       AC_MSG_CHECKING([for $2 in Boot JDK])
 264       $1=$BOOT_JDK/bin/$2
 265       if test ! -x [$]$1; then
 266         AC_MSG_RESULT(not found)
 267         AC_MSG_NOTICE([Your Boot JDK seems broken. This might be fixed by explicitly setting --with-boot-jdk])
 268         AC_MSG_ERROR([Could not find $2 in the Boot JDK])
 269       fi
 270       AC_MSG_RESULT(ok)
 271       AC_SUBST($1)
 272     ])
 273 ])
 274 
 275 ###############################################################################
 276 #
 277 # We need a Boot JDK to bootstrap the build.
 278 #
 279 
 280 AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],
 281 [
 282   BOOT_JDK_FOUND=no
 283   AC_ARG_WITH(boot-jdk, [AS_HELP_STRING([--with-boot-jdk],
 284       [path to Boot JDK (used to bootstrap build) @<:@probed@:>@])])
 285 
 286   # We look for the Boot JDK through various means, going from more certain to
 287   # more of a guess-work. After each test, BOOT_JDK_FOUND is set to "yes" if
 288   # we detected something (if so, the path to the jdk is in BOOT_JDK). But we
 289   # must check if this is indeed valid; otherwise we'll continue looking.
 290 
 291   # Test: Is bootjdk explicitly set by command line arguments?
 292   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_ARGUMENTS])
 293   if test "x$with_boot_jdk" != x && test "x$BOOT_JDK_FOUND" = xno; then
 294     # Having specified an argument which is incorrect will produce an instant failure;
 295     # we should not go on looking
 296     AC_MSG_ERROR([The path given by --with-boot-jdk does not contain a valid Boot JDK])
 297   fi
 298 
 299   # Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
 300   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR])
 301 
 302   # Test: Is $JAVA_HOME set?
 303   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_HOME])
 304 
 305   # Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
 306   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK])
 307 
 308   # Test: Is there a JDK installed in default, well-known locations?
 309   BOOTJDK_DO_CHECK([BOOTJDK_CHECK_WELL_KNOWN_LOCATIONS])
 310 
 311   # If we haven't found anything yet, we've truly lost. Give up.
 312   if test "x$BOOT_JDK_FOUND" = xno; then
 313     HELP_MSG_MISSING_DEPENDENCY([openjdk])
 314     AC_MSG_NOTICE([Could not find a valid Boot JDK. $HELP_MSG])
 315     AC_MSG_NOTICE([This might be fixed by explicitly setting --with-boot-jdk])
 316     AC_MSG_ERROR([Cannot continue])
 317   fi
 318 
 319   AC_SUBST(BOOT_JDK)
 320 
 321   # Setup tools from the Boot JDK.
 322   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVA, java)
 323   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVAC, javac)
 324   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVADOC, javadoc)
 325   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAR, jar)
 326   BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JARSIGNER, jarsigner)
 327 
 328   # Finally, set some other options...
 329 
 330   # When compiling code to be executed by the Boot JDK, force compatibility with the
 331   # oldest supported bootjdk.
 332   BOOT_JDK_SOURCETARGET="-source 9 -target 9"
 333   AC_SUBST(BOOT_JDK_SOURCETARGET)
 334 
 335   AC_SUBST(JAVAC_FLAGS)
 336 
 337   # Check if the boot jdk is 32 or 64 bit
 338   if "$JAVA" -version 2>&1 | $GREP -q "64-Bit"; then
 339     BOOT_JDK_BITS="64"
 340   else
 341     BOOT_JDK_BITS="32"
 342   fi
 343   AC_MSG_CHECKING([if Boot JDK is 32 or 64 bits])
 344   AC_MSG_RESULT([$BOOT_JDK_BITS])
 345 
 346   # Try to enable CDS
 347   AC_MSG_CHECKING([for local Boot JDK Class Data Sharing (CDS)])
 348   BOOT_JDK_CDS_ARCHIVE=$CONFIGURESUPPORT_OUTPUTDIR/classes.jsa
 349   ADD_JVM_ARG_IF_OK([-XX:+UnlockDiagnosticVMOptions -XX:-VerifySharedSpaces -XX:SharedArchiveFile=$BOOT_JDK_CDS_ARCHIVE],boot_jdk_cds_args,[$JAVA])
 350 
 351   if test "x$boot_jdk_cds_args" != x; then
 352     # Try creating a CDS archive
 353     "$JAVA" $boot_jdk_cds_args -Xshare:dump > /dev/null 2>&1
 354     if test $? -eq 0; then
 355       BOOTJDK_USE_LOCAL_CDS=true
 356       AC_MSG_RESULT([yes, created])
 357     else
 358       # Generation failed, don't use CDS.
 359       BOOTJDK_USE_LOCAL_CDS=false
 360       AC_MSG_RESULT([no, creation failed])
 361     fi
 362   else
 363     BOOTJDK_USE_LOCAL_CDS=false
 364     AC_MSG_RESULT([no, -XX:SharedArchiveFile not supported])
 365   fi
 366 ])
 367 
 368 AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK_ARGUMENTS],
 369 [
 370   # Ensure OPENJDK_TARGET_CPU_ARCH has been setup
 371   AC_REQUIRE([PLATFORM_SETUP_OPENJDK_BUILD_AND_TARGET])
 372   ##############################################################################
 373   #
 374   # Specify jvm options for anything that is run with the Boot JDK.
 375   # Not all JVM:s accept the same arguments on the command line.
 376   #
 377   AC_ARG_WITH(boot-jdk-jvmargs, [AS_HELP_STRING([--with-boot-jdk-jvmargs],
 378   [specify JVM arguments to be passed to all java invocations of boot JDK, overriding the default values,
 379   e.g --with-boot-jdk-jvmargs="-Xmx8G -enableassertions"])])
 380 
 381   AC_MSG_CHECKING([flags for boot jdk java command] )
 382 
 383   # Force en-US environment
 384   ADD_JVM_ARG_IF_OK([-Duser.language=en -Duser.country=US],boot_jdk_jvmargs,[$JAVA])
 385 
 386   if test "x$BOOTJDK_USE_LOCAL_CDS" = xtrue; then
 387     # Use our own CDS archive
 388     ADD_JVM_ARG_IF_OK([$boot_jdk_cds_args -Xshare:auto],boot_jdk_jvmargs,[$JAVA])
 389   else
 390     # Otherwise optimistically use the system-wide one, if one is present
 391     ADD_JVM_ARG_IF_OK([-Xshare:auto],boot_jdk_jvmargs,[$JAVA])
 392   fi
 393 
 394   # Apply user provided options.
 395   ADD_JVM_ARG_IF_OK([$with_boot_jdk_jvmargs],boot_jdk_jvmargs,[$JAVA])
 396 
 397   AC_MSG_RESULT([$boot_jdk_jvmargs])
 398 
 399   # For now, general JAVA_FLAGS are the same as the boot jdk jvmargs
 400   JAVA_FLAGS=$boot_jdk_jvmargs
 401   AC_SUBST(JAVA_FLAGS)
 402 
 403   AC_MSG_CHECKING([flags for boot jdk java command for big workloads])
 404 
 405   # Starting amount of heap memory.
 406   if test "x$OPENJDK_TARGET_CPU_ARCH" = "xs390"; then
 407     ADD_JVM_ARG_IF_OK([-Xms256M],boot_jdk_jvmargs_big,[$JAVA])
 408     BOOTCYCLE_JVM_ARGS_BIG=-Xms256M
 409   else
 410     ADD_JVM_ARG_IF_OK([-Xms64M],boot_jdk_jvmargs_big,[$JAVA])
 411     BOOTCYCLE_JVM_ARGS_BIG=-Xms64M
 412   fi
 413 
 414   # Maximum amount of heap memory and stack size.
 415   if test "x$OPENJDK_TARGET_CPU_ARCH" = "xs390"; then
 416     JVM_HEAP_LIMIT_32="768"
 417   else
 418     JVM_HEAP_LIMIT_32="1024"
 419   fi
 420   # Running a 64 bit JVM allows for and requires a bigger heap
 421   JVM_HEAP_LIMIT_64="1600"
 422   STACK_SIZE_32=768
 423   STACK_SIZE_64=1536
 424   JVM_HEAP_LIMIT_GLOBAL=`expr $MEMORY_SIZE / 2`
 425   if test "$JVM_HEAP_LIMIT_GLOBAL" -lt "$JVM_HEAP_LIMIT_32"; then
 426     JVM_HEAP_LIMIT_32=$JVM_HEAP_LIMIT_GLOBAL
 427   fi
 428   if test "$JVM_HEAP_LIMIT_GLOBAL" -lt "$JVM_HEAP_LIMIT_64"; then
 429     JVM_HEAP_LIMIT_64=$JVM_HEAP_LIMIT_GLOBAL
 430   fi
 431   if test "$JVM_HEAP_LIMIT_GLOBAL" -lt "512"; then
 432     JVM_HEAP_LIMIT_32=512
 433     JVM_HEAP_LIMIT_64=512
 434   fi
 435 
 436   if test "x$BOOT_JDK_BITS" = "x32"; then
 437     STACK_SIZE=$STACK_SIZE_32
 438     JVM_MAX_HEAP=$JVM_HEAP_LIMIT_32
 439   else
 440     STACK_SIZE=$STACK_SIZE_64
 441     JVM_MAX_HEAP=$JVM_HEAP_LIMIT_64
 442   fi
 443   ADD_JVM_ARG_IF_OK([-Xmx${JVM_MAX_HEAP}M],boot_jdk_jvmargs_big,[$JAVA])
 444   ADD_JVM_ARG_IF_OK([-XX:ThreadStackSize=$STACK_SIZE],boot_jdk_jvmargs_big,[$JAVA])
 445 
 446   AC_MSG_RESULT([$boot_jdk_jvmargs_big])
 447 
 448   JAVA_FLAGS_BIG=$boot_jdk_jvmargs_big
 449   AC_SUBST(JAVA_FLAGS_BIG)
 450 
 451   if test "x$OPENJDK_TARGET_CPU_BITS" = "x32"; then
 452     BOOTCYCLE_MAX_HEAP=$JVM_HEAP_LIMIT_32
 453     BOOTCYCLE_STACK_SIZE=$STACK_SIZE_32
 454   else
 455     BOOTCYCLE_MAX_HEAP=$JVM_HEAP_LIMIT_64
 456     BOOTCYCLE_STACK_SIZE=$STACK_SIZE_64
 457   fi
 458   BOOTCYCLE_JVM_ARGS_BIG="$BOOTCYCLE_JVM_ARGS_BIG -Xmx${BOOTCYCLE_MAX_HEAP}M"
 459   BOOTCYCLE_JVM_ARGS_BIG="$BOOTCYCLE_JVM_ARGS_BIG -XX:ThreadStackSize=$BOOTCYCLE_STACK_SIZE"
 460   AC_MSG_CHECKING([flags for bootcycle boot jdk java command for big workloads])
 461   AC_MSG_RESULT([$BOOTCYCLE_JVM_ARGS_BIG])
 462   AC_SUBST(BOOTCYCLE_JVM_ARGS_BIG)
 463 
 464   # By default, the main javac compilations use big
 465   JAVA_FLAGS_JAVAC="$JAVA_FLAGS_BIG"
 466   AC_SUBST(JAVA_FLAGS_JAVAC)
 467 
 468   AC_MSG_CHECKING([flags for boot jdk java command for small workloads])
 469 
 470   # Use serial gc for small short lived tools if possible
 471   ADD_JVM_ARG_IF_OK([-XX:+UseSerialGC],boot_jdk_jvmargs_small,[$JAVA])
 472   ADD_JVM_ARG_IF_OK([-Xms32M],boot_jdk_jvmargs_small,[$JAVA])
 473   ADD_JVM_ARG_IF_OK([-Xmx512M],boot_jdk_jvmargs_small,[$JAVA])
 474   ADD_JVM_ARG_IF_OK([-XX:TieredStopAtLevel=1],boot_jdk_jvmargs_small,[$JAVA])
 475 
 476   AC_MSG_RESULT([$boot_jdk_jvmargs_small])
 477 
 478   JAVA_FLAGS_SMALL=$boot_jdk_jvmargs_small
 479   AC_SUBST(JAVA_FLAGS_SMALL)
 480 
 481   JAVA_TOOL_FLAGS_SMALL=""
 482   for f in $JAVA_FLAGS_SMALL; do
 483     JAVA_TOOL_FLAGS_SMALL="$JAVA_TOOL_FLAGS_SMALL -J$f"
 484   done
 485   AC_SUBST(JAVA_TOOL_FLAGS_SMALL)
 486 ])
 487 
 488 # BUILD_JDK: the location of the latest JDK that can run
 489 #   on the host system and supports the target class file version
 490 #   generated in this JDK build.  This variable should only be
 491 #   used after the launchers are built.
 492 #
 493 
 494 # Execute the check given as argument, and verify the result.
 495 # If the JDK was previously found, do nothing.
 496 # $1 A command line (typically autoconf macro) to execute
 497 AC_DEFUN([BOOTJDK_CHECK_BUILD_JDK],
 498 [
 499   if test "x$BUILD_JDK_FOUND" = xno; then
 500     # Execute the test
 501     $1
 502 
 503     # If previous step claimed to have found a JDK, check it to see if it seems to be valid.
 504     if test "x$BUILD_JDK_FOUND" = xmaybe; then
 505       # Do we have a bin/java?
 506       if test ! -x "$BUILD_JDK/bin/java"; then
 507         AC_MSG_NOTICE([Potential Build JDK found at $BUILD_JDK did not contain bin/java; ignoring])
 508         BUILD_JDK_FOUND=no
 509       elif test ! -x "$BUILD_JDK/bin/jlink"; then
 510         AC_MSG_NOTICE([Potential Build JDK found at $BUILD_JDK did not contain bin/jlink; ignoring])
 511         BUILD_JDK_FOUND=no
 512       elif test ! -x "$BUILD_JDK/bin/jmod"; then
 513         AC_MSG_NOTICE([Potential Build JDK found at $BUILD_JDK did not contain bin/jmod; ignoring])
 514         BUILD_JDK_FOUND=no
 515       elif test ! -x "$BUILD_JDK/bin/javac"; then
 516         # Do we have a bin/javac?
 517         AC_MSG_NOTICE([Potential Build JDK found at $BUILD_JDK did not contain bin/javac; ignoring])
 518         AC_MSG_NOTICE([(This might be a JRE instead of an JDK)])
 519         BUILD_JDK_FOUND=no
 520       else
 521         # Oh, this is looking good! We probably have found a proper JDK. Is it the correct version?
 522         BUILD_JDK_VERSION=`"$BUILD_JDK/bin/java" -version 2>&1 | $HEAD -n 1`
 523 
 524         # Extra M4 quote needed to protect [] in grep expression.
 525         [FOUND_CORRECT_VERSION=`echo $BUILD_JDK_VERSION | $EGREP "\"$VERSION_FEATURE([\.+-].*)?\""`]
 526         if test "x$FOUND_CORRECT_VERSION" = x; then
 527           AC_MSG_NOTICE([Potential Build JDK found at $BUILD_JDK is incorrect JDK version ($BUILD_JDK_VERSION); ignoring])
 528           AC_MSG_NOTICE([(Your Build JDK must be version $VERSION_FEATURE)])
 529           BUILD_JDK_FOUND=no
 530         else
 531           # We're done!
 532           BUILD_JDK_FOUND=yes
 533           BASIC_FIXUP_PATH(BUILD_JDK)
 534           AC_MSG_CHECKING([for Build JDK])
 535           AC_MSG_RESULT([$BUILD_JDK])
 536           AC_MSG_CHECKING([Build JDK version])
 537           BUILD_JDK_VERSION=`"$BUILD_JDK/bin/java" -version 2>&1 | $TR '\n\r' '  '`
 538           AC_MSG_RESULT([$BUILD_JDK_VERSION])
 539         fi # end check jdk version
 540       fi # end check java
 541     fi # end check build jdk found
 542   fi
 543 ])
 544 
 545 # By default the BUILD_JDK is the JDK_OUTPUTDIR.  If the target architecture
 546 # is different than the host system doing the build (e.g. cross-compilation),
 547 # a special BUILD_JDK is built as part of the build process.  An external
 548 # prebuilt BUILD_JDK can also be supplied.
 549 AC_DEFUN([BOOTJDK_SETUP_BUILD_JDK],
 550 [
 551   AC_ARG_WITH(build-jdk, [AS_HELP_STRING([--with-build-jdk],
 552       [path to JDK of same version as is being built@<:@the newly built JDK@:>@])])
 553 
 554   CREATE_BUILDJDK=false
 555   EXTERNAL_BUILDJDK=false
 556   BUILD_JDK_FOUND="no"
 557   if test "x$with_build_jdk" != "x"; then
 558     BOOTJDK_CHECK_BUILD_JDK([
 559        if test "x$with_build_jdk" != x; then
 560          BUILD_JDK=$with_build_jdk
 561          BUILD_JDK_FOUND=maybe
 562          AC_MSG_NOTICE([Found potential Build JDK using configure arguments])
 563        fi])
 564     EXTERNAL_BUILDJDK=true
 565   else
 566     if test "x$COMPILE_TYPE" = "xcross"; then
 567       BUILD_JDK="\$(BUILDJDK_OUTPUTDIR)/jdk"
 568       BUILD_JDK_FOUND=yes
 569       CREATE_BUILDJDK=true
 570       AC_MSG_CHECKING([for Build JDK])
 571       AC_MSG_RESULT([yes, will build it for the host platform])
 572     else
 573       BUILD_JDK="\$(JDK_OUTPUTDIR)"
 574       BUILD_JDK_FOUND=yes
 575       AC_MSG_CHECKING([for Build JDK])
 576       AC_MSG_RESULT([yes, will use output dir])
 577     fi
 578   fi
 579 
 580   JMOD="$BUILD_JDK/bin/jmod"
 581   JLINK="$BUILD_JDK/bin/jlink"
 582   AC_SUBST(JMOD)
 583   AC_SUBST(JLINK)
 584 
 585   if test "x$BUILD_JDK_FOUND" != "xyes"; then
 586     AC_MSG_CHECKING([for Build JDK])
 587     AC_MSG_RESULT([no])
 588     AC_MSG_ERROR([Could not find a suitable Build JDK])
 589   fi
 590 
 591   AC_SUBST(CREATE_BUILDJDK)
 592   AC_SUBST(BUILD_JDK)
 593   AC_SUBST(EXTERNAL_BUILDJDK)
 594 ])