1 #
   2 # Copyright (c) 2011, 2018, 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 # All valid JVM features, regardless of platform
  27 VALID_JVM_FEATURES="compiler1 compiler2 zero minimal dtrace jvmti jvmci \
  28     graal vm-structs jni-check services management cmsgc g1gc parallelgc serialgc nmt cds \
  29     static-build link-time-opt aot jfr"
  30 
  31 # Deprecated JVM features (these are ignored, but with a warning)
  32 DEPRECATED_JVM_FEATURES="trace"
  33 
  34 # All valid JVM variants
  35 VALID_JVM_VARIANTS="server client minimal core zero custom"
  36 
  37 ###############################################################################
  38 # Check if the specified JVM variant should be built. To be used in shell if
  39 # constructs, like this:
  40 # if HOTSPOT_CHECK_JVM_VARIANT(server); then
  41 #
  42 # Only valid to use after HOTSPOT_SETUP_JVM_VARIANTS has setup variants.
  43 
  44 # Definition kept in one line to allow inlining in if statements.
  45 # Additional [] needed to keep m4 from mangling shell constructs.
  46 AC_DEFUN([HOTSPOT_CHECK_JVM_VARIANT],
  47 [ [ [[ " $JVM_VARIANTS " =~ " $1 " ]] ] ])
  48 
  49 ###############################################################################
  50 # Check if the specified JVM features are explicitly enabled. To be used in
  51 # shell if constructs, like this:
  52 # if HOTSPOT_CHECK_JVM_FEATURE(jvmti); then
  53 #
  54 # Only valid to use after HOTSPOT_SETUP_JVM_FEATURES has setup features.
  55 
  56 # Definition kept in one line to allow inlining in if statements.
  57 # Additional [] needed to keep m4 from mangling shell constructs.
  58 AC_DEFUN([HOTSPOT_CHECK_JVM_FEATURE],
  59 [ [ [[ " $JVM_FEATURES " =~ " $1 " ]] ] ])
  60 
  61 ###############################################################################
  62 # Check which variants of the JVM that we want to build. Available variants are:
  63 #   server: normal interpreter, and a tiered C1/C2 compiler
  64 #   client: normal interpreter, and C1 (no C2 compiler)
  65 #   minimal: reduced form of client with optional features stripped out
  66 #   core: normal interpreter only, no compiler
  67 #   zero: C++ based interpreter only, no compiler
  68 #   custom: baseline JVM with no default features
  69 #
  70 AC_DEFUN_ONCE([HOTSPOT_SETUP_JVM_VARIANTS],
  71 [
  72   AC_ARG_WITH([jvm-variants], [AS_HELP_STRING([--with-jvm-variants],
  73       [JVM variants (separated by commas) to build (server,client,minimal,core,zero,custom) @<:@server@:>@])])
  74 
  75   SETUP_HOTSPOT_TARGET_CPU_PORT
  76 
  77   if test "x$with_jvm_variants" = x; then
  78     with_jvm_variants="server"
  79   fi
  80   JVM_VARIANTS_OPT="$with_jvm_variants"
  81 
  82   # Has the user listed more than one variant?
  83   # Additional [] needed to keep m4 from mangling shell constructs.
  84   if [ [[ "$JVM_VARIANTS_OPT" =~ "," ]] ]; then
  85     BUILDING_MULTIPLE_JVM_VARIANTS=true
  86   else
  87     BUILDING_MULTIPLE_JVM_VARIANTS=false
  88   fi
  89   # Replace the commas with AND for use in the build directory name.
  90   JVM_VARIANTS_WITH_AND=`$ECHO "$JVM_VARIANTS_OPT" | $SED -e 's/,/AND/g'`
  91 
  92   AC_MSG_CHECKING([which variants of the JVM to build])
  93   # JVM_VARIANTS is a space-separated list.
  94   # Also use minimal, not minimal1 (which is kept for backwards compatibility).
  95   JVM_VARIANTS=`$ECHO $JVM_VARIANTS_OPT | $SED -e 's/,/ /g' -e 's/minimal1/minimal/'`
  96   AC_MSG_RESULT([$JVM_VARIANTS])
  97 
  98   # Check that the selected variants are valid
  99   BASIC_GET_NON_MATCHING_VALUES(INVALID_VARIANTS, $JVM_VARIANTS, $VALID_JVM_VARIANTS)
 100   if test "x$INVALID_VARIANTS" != x; then
 101     AC_MSG_NOTICE([Unknown variant(s) specified: "$INVALID_VARIANTS"])
 102     AC_MSG_NOTICE([The available JVM variants are: "$VALID_JVM_VARIANTS"])
 103     AC_MSG_ERROR([Cannot continue])
 104   fi
 105 
 106   # All "special" variants share the same output directory ("server")
 107   VALID_MULTIPLE_JVM_VARIANTS="server client minimal"
 108   BASIC_GET_NON_MATCHING_VALUES(INVALID_MULTIPLE_VARIANTS, $JVM_VARIANTS, $VALID_MULTIPLE_JVM_VARIANTS)
 109   if  test "x$INVALID_MULTIPLE_VARIANTS" != x && test "x$BUILDING_MULTIPLE_JVM_VARIANTS" = xtrue; then
 110     AC_MSG_ERROR([You cannot build multiple variants with anything else than $VALID_MULTIPLE_JVM_VARIANTS.])
 111   fi
 112 
 113   # The "main" variant is the one used by other libs to link against during the
 114   # build.
 115   if test "x$BUILDING_MULTIPLE_JVM_VARIANTS" = "xtrue"; then
 116     MAIN_VARIANT_PRIO_ORDER="server client minimal"
 117     for variant in $MAIN_VARIANT_PRIO_ORDER; do
 118       if HOTSPOT_CHECK_JVM_VARIANT($variant); then
 119         JVM_VARIANT_MAIN="$variant"
 120         break
 121       fi
 122     done
 123   else
 124     JVM_VARIANT_MAIN="$JVM_VARIANTS"
 125   fi
 126 
 127   AC_SUBST(JVM_VARIANTS)
 128   AC_SUBST(VALID_JVM_VARIANTS)
 129   AC_SUBST(JVM_VARIANT_MAIN)
 130 
 131   if HOTSPOT_CHECK_JVM_VARIANT(zero); then
 132     # zero behaves as a platform and rewrites these values. This is really weird. :(
 133     # We are guaranteed that we do not build any other variants when building zero.
 134     HOTSPOT_TARGET_CPU=zero
 135     HOTSPOT_TARGET_CPU_ARCH=zero
 136   fi
 137 ])
 138 
 139 ###############################################################################
 140 # Check if dtrace should be enabled and has all prerequisites present.
 141 #
 142 AC_DEFUN_ONCE([HOTSPOT_SETUP_DTRACE],
 143 [
 144   # Test for dtrace dependencies
 145   AC_ARG_ENABLE([dtrace], [AS_HELP_STRING([--enable-dtrace@<:@=yes/no/auto@:>@],
 146       [enable dtrace. Default is auto, where dtrace is enabled if all dependencies
 147       are present.])])
 148 
 149   DTRACE_DEP_MISSING=false
 150 
 151   AC_MSG_CHECKING([for dtrace tool])
 152   if test "x$DTRACE" != "x" && test -x "$DTRACE"; then
 153     AC_MSG_RESULT([$DTRACE])
 154   else
 155     AC_MSG_RESULT([not found, cannot build dtrace])
 156     DTRACE_DEP_MISSING=true
 157   fi
 158 
 159   AC_CHECK_HEADERS([sys/sdt.h], [DTRACE_HEADERS_OK=yes],[DTRACE_HEADERS_OK=no])
 160   if test "x$DTRACE_HEADERS_OK" != "xyes"; then
 161     DTRACE_DEP_MISSING=true
 162   fi
 163 
 164   AC_MSG_CHECKING([if dtrace should be built])
 165   if test "x$enable_dtrace" = "xyes"; then
 166     if test "x$DTRACE_DEP_MISSING" = "xtrue"; then
 167       AC_MSG_RESULT([no, missing dependencies])
 168       HELP_MSG_MISSING_DEPENDENCY([dtrace])
 169       AC_MSG_ERROR([Cannot enable dtrace with missing dependencies. See above. $HELP_MSG])
 170     else
 171       INCLUDE_DTRACE=true
 172       AC_MSG_RESULT([yes, forced])
 173     fi
 174   elif test "x$enable_dtrace" = "xno"; then
 175     INCLUDE_DTRACE=false
 176     AC_MSG_RESULT([no, forced])
 177   elif test "x$enable_dtrace" = "xauto" || test "x$enable_dtrace" = "x"; then
 178     if test "x$DTRACE_DEP_MISSING" = "xtrue"; then
 179       INCLUDE_DTRACE=false
 180       AC_MSG_RESULT([no, missing dependencies])
 181     else
 182       INCLUDE_DTRACE=true
 183       AC_MSG_RESULT([yes, dependencies present])
 184     fi
 185   else
 186     AC_MSG_ERROR([Invalid value for --enable-dtrace: $enable_dtrace])
 187   fi
 188 ])
 189 
 190 ################################################################################
 191 # Check if AOT should be enabled
 192 #
 193 AC_DEFUN_ONCE([HOTSPOT_ENABLE_DISABLE_AOT],
 194 [
 195   AC_ARG_ENABLE([aot], [AS_HELP_STRING([--enable-aot@<:@=yes/no/auto@:>@],
 196       [enable ahead of time compilation feature. Default is auto, where aot is enabled if all dependencies are present.])])
 197 
 198   if test "x$enable_aot" = "x" || test "x$enable_aot" = "xauto"; then
 199     ENABLE_AOT="true"
 200   elif test "x$enable_aot" = "xyes"; then
 201     ENABLE_AOT="true"
 202   elif test "x$enable_aot" = "xno"; then
 203     ENABLE_AOT="false"
 204     AC_MSG_CHECKING([if aot should be enabled])
 205     AC_MSG_RESULT([no, forced])
 206   else
 207     AC_MSG_ERROR([Invalid value for --enable-aot: $enable_aot])
 208   fi
 209 
 210   if test "x$ENABLE_AOT" = "xtrue"; then
 211     # Only enable AOT on X64 platforms.
 212     if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
 213       if test -e "${TOPDIR}/src/jdk.aot"; then
 214         if test -e "${TOPDIR}/src/jdk.internal.vm.compiler"; then
 215           ENABLE_AOT="true"
 216         else
 217           ENABLE_AOT="false"
 218           if test "x$enable_aot" = "xyes"; then
 219             AC_MSG_ERROR([Cannot build AOT without src/jdk.internal.vm.compiler sources. Remove --enable-aot.])
 220           fi
 221         fi
 222       else
 223         ENABLE_AOT="false"
 224         if test "x$enable_aot" = "xyes"; then
 225           AC_MSG_ERROR([Cannot build AOT without src/jdk.aot sources. Remove --enable-aot.])
 226         fi
 227       fi
 228     else
 229       ENABLE_AOT="false"
 230       if test "x$enable_aot" = "xyes"; then
 231         AC_MSG_ERROR([AOT is currently only supported on x86_64. Remove --enable-aot.])
 232       fi
 233     fi
 234   fi
 235 
 236   AC_SUBST(ENABLE_AOT)
 237 ])
 238 
 239 ################################################################################
 240 # Allow to disable CDS
 241 #
 242 AC_DEFUN_ONCE([HOTSPOT_ENABLE_DISABLE_CDS],
 243 [
 244   AC_ARG_ENABLE([cds], [AS_HELP_STRING([--enable-cds@<:@=yes/no@:>@],
 245       [enable class data sharing feature in non-minimal VM. Default is yes.])])
 246 
 247   if test "x$enable_cds" = "x" || test "x$enable_cds" = "xyes"; then
 248     ENABLE_CDS="true"
 249   elif test "x$enable_cds" = "xno"; then
 250     ENABLE_CDS="false"
 251   else
 252     AC_MSG_ERROR([Invalid value for --enable-cds: $enable_cds])
 253   fi
 254 
 255   AC_SUBST(ENABLE_CDS)
 256 ])
 257 
 258 ###############################################################################
 259 # Set up all JVM features for each JVM variant.
 260 #
 261 AC_DEFUN_ONCE([HOTSPOT_SETUP_JVM_FEATURES],
 262 [
 263   # Prettify the VALID_JVM_FEATURES string
 264   BASIC_SORT_LIST(VALID_JVM_FEATURES, $VALID_JVM_FEATURES)
 265 
 266   # The user can in some cases supply additional jvm features. For the custom
 267   # variant, this defines the entire variant.
 268   AC_ARG_WITH([jvm-features], [AS_HELP_STRING([--with-jvm-features],
 269       [JVM features to enable (foo) or disable (-foo), separated by comma. Use '--help' to show possible values @<:@none@:>@])])
 270   if test "x$with_jvm_features" != x; then
 271     AC_MSG_CHECKING([user specified JVM feature list])
 272     USER_JVM_FEATURE_LIST=`$ECHO $with_jvm_features | $SED -e 's/,/ /g'`
 273     AC_MSG_RESULT([$user_jvm_feature_list])
 274     # These features will be added to all variant defaults
 275     JVM_FEATURES=`$ECHO $USER_JVM_FEATURE_LIST | $AWK '{ for (i=1; i<=NF; i++) if (!match($i, /^-.*/)) printf("%s ", $i) }'`
 276     # These features will be removed from all variant defaults
 277     DISABLED_JVM_FEATURES=`$ECHO $USER_JVM_FEATURE_LIST | $AWK '{ for (i=1; i<=NF; i++) if (match($i, /^-.*/)) printf("%s ", substr($i, 2))}'`
 278 
 279     # Verify that the user has provided valid features
 280     BASIC_GET_NON_MATCHING_VALUES(INVALID_FEATURES, $JVM_FEATURES $DISABLED_JVM_FEATURES, $VALID_JVM_FEATURES $DEPRECATED_JVM_FEATURES)
 281     if test "x$INVALID_FEATURES" != x; then
 282       AC_MSG_NOTICE([Unknown JVM features specified: "$INVALID_FEATURES"])
 283       AC_MSG_NOTICE([The available JVM features are: "$VALID_JVM_FEATURES"])
 284       AC_MSG_ERROR([Cannot continue])
 285     fi
 286 
 287     # Check if the user has provided deprecated features
 288     BASIC_GET_MATCHING_VALUES(DEPRECATED_FEATURES, $JVM_FEATURES $DISABLED_JVM_FEATURES, $DEPRECATED_JVM_FEATURES)
 289     if test "x$DEPRECATED_FEATURES" != x; then
 290       AC_MSG_WARN([Deprecated JVM features specified (will be ignored): "$DEPRECATED_FEATURES"])
 291       # Filter out deprecated features
 292       BASIC_GET_NON_MATCHING_VALUES(JVM_FEATURES, $JVM_FEATURES, $DEPRECATED_FEATURES)
 293       BASIC_GET_NON_MATCHING_VALUES(DISABLED_JVM_FEATURES, $DISABLED_JVM_FEATURES, $DEPRECATED_FEATURES)
 294     fi
 295 
 296   fi
 297 
 298   # Override hotspot cpu definitions for ARM platforms
 299   if test "x$OPENJDK_TARGET_CPU" = xarm; then
 300     HOTSPOT_TARGET_CPU=arm_32
 301     HOTSPOT_TARGET_CPU_DEFINE="ARM32"
 302   elif test "x$OPENJDK_TARGET_CPU" = xaarch64 && test "x$HOTSPOT_TARGET_CPU_PORT" = xarm64; then
 303     HOTSPOT_TARGET_CPU=arm_64
 304     HOTSPOT_TARGET_CPU_ARCH=arm
 305   fi
 306 
 307   # Verify that dependencies are met for explicitly set features.
 308   if HOTSPOT_CHECK_JVM_FEATURE(jvmti) && ! HOTSPOT_CHECK_JVM_FEATURE(services); then
 309     AC_MSG_ERROR([Specified JVM feature 'jvmti' requires feature 'services'])
 310   fi
 311 
 312   if HOTSPOT_CHECK_JVM_FEATURE(management) && ! HOTSPOT_CHECK_JVM_FEATURE(nmt); then
 313     AC_MSG_ERROR([Specified JVM feature 'management' requires feature 'nmt'])
 314   fi
 315 
 316   if HOTSPOT_CHECK_JVM_FEATURE(jvmci) && ! (HOTSPOT_CHECK_JVM_FEATURE(compiler1) || HOTSPOT_CHECK_JVM_FEATURE(compiler2)); then
 317     AC_MSG_ERROR([Specified JVM feature 'jvmci' requires feature 'compiler2' or 'compiler1'])
 318   fi
 319 
 320   if HOTSPOT_CHECK_JVM_FEATURE(cmsgc) && ! HOTSPOT_CHECK_JVM_FEATURE(serialgc); then
 321     AC_MSG_ERROR([Specified JVM feature 'cmsgc' requires feature 'serialgc'])
 322   fi
 323 
 324   # Enable JFR by default, except for Zero, linux-sparcv9 and on minimal.
 325   if ! HOTSPOT_CHECK_JVM_VARIANT(zero); then
 326     if test "x$OPENJDK_TARGET_OS" != xlinux || test "x$OPENJDK_TARGET_CPU" != xsparcv9; then
 327       NON_MINIMAL_FEATURES="$NON_MINIMAL_FEATURES jfr"
 328     fi
 329   fi
 330 
 331   # Turn on additional features based on other parts of configure
 332   if test "x$INCLUDE_DTRACE" = "xtrue"; then
 333     JVM_FEATURES="$JVM_FEATURES dtrace"
 334   else
 335     if HOTSPOT_CHECK_JVM_FEATURE(dtrace); then
 336       AC_MSG_ERROR([To enable dtrace, you must use --enable-dtrace])
 337     fi
 338   fi
 339 
 340   if test "x$STATIC_BUILD" = "xtrue"; then
 341     JVM_FEATURES="$JVM_FEATURES static-build"
 342   else
 343     if HOTSPOT_CHECK_JVM_FEATURE(static-build); then
 344       AC_MSG_ERROR([To enable static-build, you must use --enable-static-build])
 345     fi
 346   fi
 347 
 348   if ! HOTSPOT_CHECK_JVM_VARIANT(zero); then
 349     if HOTSPOT_CHECK_JVM_FEATURE(zero); then
 350       AC_MSG_ERROR([To enable zero, you must use --with-jvm-variants=zero])
 351     fi
 352   fi
 353 
 354   # Only enable jvmci on x86_64, sparcv9 and aarch64.
 355   if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || \
 356      test "x$OPENJDK_TARGET_CPU" = "xsparcv9" || \
 357      test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
 358     JVM_FEATURES_jvmci="jvmci"
 359   else
 360     JVM_FEATURES_jvmci=""
 361   fi
 362 
 363   AC_MSG_CHECKING([if jdk.internal.vm.compiler should be built])
 364   if HOTSPOT_CHECK_JVM_FEATURE(graal); then
 365     AC_MSG_RESULT([yes, forced])
 366     if test "x$JVM_FEATURES_jvmci" != "xjvmci" ; then
 367       AC_MSG_ERROR([Specified JVM feature 'graal' requires feature 'jvmci'])
 368     fi
 369     INCLUDE_GRAAL="true"
 370   else
 371     # By default enable graal build on x64 or where AOT is available.
 372     # graal build requires jvmci.
 373     if test "x$JVM_FEATURES_jvmci" = "xjvmci" && \
 374         (test "x$OPENJDK_TARGET_CPU" = "xx86_64" || \
 375          test "x$ENABLE_AOT" = "xtrue") ; then
 376       AC_MSG_RESULT([yes])
 377       JVM_FEATURES_graal="graal"
 378       INCLUDE_GRAAL="true"
 379     else
 380       AC_MSG_RESULT([no])
 381       JVM_FEATURES_graal=""
 382       INCLUDE_GRAAL="false"
 383     fi
 384   fi
 385 
 386   AC_SUBST(INCLUDE_GRAAL)
 387 
 388   AC_MSG_CHECKING([if aot should be enabled])
 389   if test "x$ENABLE_AOT" = "xtrue"; then
 390     if test "x$enable_aot" = "xyes"; then
 391       AC_MSG_RESULT([yes, forced])
 392     else
 393       AC_MSG_RESULT([yes])
 394     fi
 395     JVM_FEATURES_aot="aot"
 396   else
 397     if test "x$enable_aot" = "xno"; then
 398       AC_MSG_RESULT([no, forced])
 399     else
 400       AC_MSG_RESULT([no])
 401     fi
 402     JVM_FEATURES_aot=""
 403   fi
 404 
 405   if test "x$OPENJDK_TARGET_CPU" = xarm ; then
 406     # Default to use link time optimizations on minimal on arm
 407     JVM_FEATURES_link_time_opt="link-time-opt"
 408   else
 409     JVM_FEATURES_link_time_opt=""
 410   fi
 411 
 412   # All variants but minimal (and custom) get these features
 413   NON_MINIMAL_FEATURES="$NON_MINIMAL_FEATURES cmsgc g1gc parallelgc serialgc jni-check jvmti management nmt services vm-structs"
 414   if test "x$ENABLE_CDS" = "xtrue"; then
 415     NON_MINIMAL_FEATURES="$NON_MINIMAL_FEATURES cds"
 416   fi
 417 
 418   # Enable features depending on variant.
 419   JVM_FEATURES_server="compiler1 compiler2 $NON_MINIMAL_FEATURES $JVM_FEATURES $JVM_FEATURES_jvmci $JVM_FEATURES_aot $JVM_FEATURES_graal"
 420   JVM_FEATURES_client="compiler1 $NON_MINIMAL_FEATURES $JVM_FEATURES $JVM_FEATURES_jvmci"
 421   JVM_FEATURES_core="$NON_MINIMAL_FEATURES $JVM_FEATURES"
 422   JVM_FEATURES_minimal="compiler1 minimal serialgc $JVM_FEATURES $JVM_FEATURES_link_time_opt"
 423   JVM_FEATURES_zero="zero $NON_MINIMAL_FEATURES $JVM_FEATURES"
 424   JVM_FEATURES_custom="$JVM_FEATURES"
 425 
 426   AC_SUBST(JVM_FEATURES_server)
 427   AC_SUBST(JVM_FEATURES_client)
 428   AC_SUBST(JVM_FEATURES_core)
 429   AC_SUBST(JVM_FEATURES_minimal)
 430   AC_SUBST(JVM_FEATURES_zero)
 431   AC_SUBST(JVM_FEATURES_custom)
 432 
 433   # Used for verification of Makefiles by check-jvm-feature
 434   AC_SUBST(VALID_JVM_FEATURES)
 435 
 436   # We don't support --with-jvm-interpreter anymore, use zero instead.
 437   BASIC_DEPRECATED_ARG_WITH(jvm-interpreter)
 438 ])
 439 
 440 ###############################################################################
 441 # Finalize JVM features once all setup is complete, including custom setup.
 442 #
 443 AC_DEFUN_ONCE([HOTSPOT_FINALIZE_JVM_FEATURES],
 444 [
 445   for variant in $JVM_VARIANTS; do
 446     AC_MSG_CHECKING([JVM features for JVM variant '$variant'])
 447     features_var_name=JVM_FEATURES_$variant
 448     JVM_FEATURES_FOR_VARIANT=${!features_var_name}
 449 
 450     # Filter out user-requested disabled features
 451     BASIC_GET_NON_MATCHING_VALUES(JVM_FEATURES_FOR_VARIANT, $JVM_FEATURES_FOR_VARIANT, $DISABLED_JVM_FEATURES)
 452 
 453     # Keep feature lists sorted and free of duplicates
 454     BASIC_SORT_LIST(JVM_FEATURES_FOR_VARIANT, $JVM_FEATURES_FOR_VARIANT)
 455 
 456     # Update real feature set variable
 457     eval $features_var_name='"'$JVM_FEATURES_FOR_VARIANT'"'
 458     AC_MSG_RESULT(["$JVM_FEATURES_FOR_VARIANT"])
 459 
 460     # Verify that we have at least one gc selected
 461     GC_FEATURES=`$ECHO $JVM_FEATURES_FOR_VARIANT | $GREP gc`
 462     if test "x$GC_FEATURES" = x; then
 463       AC_MSG_WARN([Invalid JVM features: No gc selected for variant $variant.])
 464     fi
 465 
 466     # Validate features (for configure script errors, not user errors)
 467     BASIC_GET_NON_MATCHING_VALUES(INVALID_FEATURES, $JVM_FEATURES_FOR_VARIANT, $VALID_JVM_FEATURES)
 468     if test "x$INVALID_FEATURES" != x; then
 469       AC_MSG_ERROR([Internal configure script error. Invalid JVM feature(s): $INVALID_FEATURES])
 470     fi
 471   done
 472 ])
 473 
 474 ################################################################################
 475 #
 476 # Specify which sources will be used to build the 64-bit ARM port
 477 #
 478 # --with-cpu-port=arm64   will use hotspot/src/cpu/arm
 479 # --with-cpu-port=aarch64 will use hotspot/src/cpu/aarch64
 480 #
 481 AC_DEFUN([SETUP_HOTSPOT_TARGET_CPU_PORT],
 482 [
 483   AC_ARG_WITH(cpu-port, [AS_HELP_STRING([--with-cpu-port],
 484       [specify sources to use for Hotspot 64-bit ARM port (arm64,aarch64) @<:@aarch64@:>@ ])])
 485 
 486   if test "x$with_cpu_port" != x; then
 487     if test "x$OPENJDK_TARGET_CPU" != xaarch64; then
 488       AC_MSG_ERROR([--with-cpu-port only available on aarch64])
 489     fi
 490     if test "x$with_cpu_port" != xarm64 && \
 491         test "x$with_cpu_port" != xaarch64; then
 492       AC_MSG_ERROR([--with-cpu-port must specify arm64 or aarch64])
 493     fi
 494     HOTSPOT_TARGET_CPU_PORT="$with_cpu_port"
 495   fi
 496 ])
 497 
 498 
 499 ################################################################################
 500 # Check if gtest should be built
 501 #
 502 AC_DEFUN_ONCE([HOTSPOT_ENABLE_DISABLE_GTEST],
 503 [
 504   AC_ARG_ENABLE([hotspot-gtest], [AS_HELP_STRING([--disable-hotspot-gtest],
 505       [Disables building of the Hotspot unit tests @<:@enabled@:>@])])
 506 
 507   if test -e "${TOPDIR}/test/hotspot/gtest"; then
 508     GTEST_DIR_EXISTS="true"
 509   else
 510     GTEST_DIR_EXISTS="false"
 511   fi
 512 
 513   AC_MSG_CHECKING([if Hotspot gtest unit tests should be built])
 514   if test "x$enable_hotspot_gtest" = "xyes"; then
 515     if test "x$GTEST_DIR_EXISTS" = "xtrue"; then
 516       AC_MSG_RESULT([yes, forced])
 517       BUILD_GTEST="true"
 518     else
 519       AC_MSG_ERROR([Cannot build gtest without the test source])
 520     fi
 521   elif test "x$enable_hotspot_gtest" = "xno"; then
 522     AC_MSG_RESULT([no, forced])
 523     BUILD_GTEST="false"
 524   elif test "x$enable_hotspot_gtest" = "x"; then
 525     if test "x$GTEST_DIR_EXISTS" = "xtrue"; then
 526       AC_MSG_RESULT([yes])
 527       BUILD_GTEST="true"
 528     else
 529       AC_MSG_RESULT([no])
 530       BUILD_GTEST="false"
 531     fi
 532   else
 533     AC_MSG_ERROR([--enable-gtest must be either yes or no])
 534   fi
 535 
 536   AC_SUBST(BUILD_GTEST)
 537 ])