#
# Copyright (c) 2011, 2017, 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.
#

###############################################################################
# Check which variant of the JDK that we want to build.
# Currently we have:
#    normal:   standard edition
# but the custom make system may add other variants
#
# Effectively the JDK variant gives a name to a specific set of
# modules to compile into the JDK.
AC_DEFUN_ONCE([JDKOPT_SETUP_JDK_VARIANT],
[
  AC_MSG_CHECKING([which variant of the JDK to build])
  AC_ARG_WITH([jdk-variant], [AS_HELP_STRING([--with-jdk-variant],
      [JDK variant to build (normal) @<:@normal@:>@])])

  if test "x$with_jdk_variant" = xnormal || test "x$with_jdk_variant" = x; then
    JDK_VARIANT="normal"
  else
    AC_MSG_ERROR([The available JDK variants are: normal])
  fi

  AC_SUBST(JDK_VARIANT)

  AC_MSG_RESULT([$JDK_VARIANT])
])

###############################################################################
# Set the debug level
#    release: no debug information, all optimizations, no asserts.
#    optimized: no debug information, all optimizations, no asserts, HotSpot target is 'optimized'.
#    fastdebug: debug information (-g), all optimizations, all asserts
#    slowdebug: debug information (-g), no optimizations, all asserts
AC_DEFUN_ONCE([JDKOPT_SETUP_DEBUG_LEVEL],
[
  DEBUG_LEVEL="release"
  AC_MSG_CHECKING([which debug level to use])
  AC_ARG_ENABLE([debug], [AS_HELP_STRING([--enable-debug],
      [set the debug level to fastdebug (shorthand for --with-debug-level=fastdebug) @<:@disabled@:>@])],
      [
        ENABLE_DEBUG="${enableval}"
        DEBUG_LEVEL="fastdebug"
      ], [ENABLE_DEBUG="no"])

  AC_ARG_WITH([debug-level], [AS_HELP_STRING([--with-debug-level],
      [set the debug level (release, fastdebug, slowdebug, optimized) @<:@release@:>@])],
      [
        DEBUG_LEVEL="${withval}"
        if test "x$ENABLE_DEBUG" = xyes; then
          AC_MSG_ERROR([You cannot use both --enable-debug and --with-debug-level at the same time.])
        fi
      ])
  AC_MSG_RESULT([$DEBUG_LEVEL])

  if test "x$DEBUG_LEVEL" != xrelease && \
      test "x$DEBUG_LEVEL" != xoptimized && \
      test "x$DEBUG_LEVEL" != xfastdebug && \
      test "x$DEBUG_LEVEL" != xslowdebug; then
    AC_MSG_ERROR([Allowed debug levels are: release, fastdebug, slowdebug and optimized])
  fi

  # Translate DEBUG_LEVEL to debug level used by Hotspot
  HOTSPOT_DEBUG_LEVEL="$DEBUG_LEVEL"
  if test "x$DEBUG_LEVEL" = xrelease; then
    HOTSPOT_DEBUG_LEVEL="product"
  elif test "x$DEBUG_LEVEL" = xslowdebug; then
    HOTSPOT_DEBUG_LEVEL="debug"
  fi

  if test "x$DEBUG_LEVEL" = xoptimized; then
    # The debug level 'optimized' is a little special because it is currently only
    # applicable to the HotSpot build where it means to build a completely
    # optimized version of the VM without any debugging code (like for the
    # 'release' debug level which is called 'product' in the HotSpot build) but
    # with the exception that it can contain additional code which is otherwise
    # protected by '#ifndef PRODUCT' macros. These 'optimized' builds are used to
    # test new and/or experimental features which are not intended for customer
    # shipment. Because these new features need to be tested and benchmarked in
    # real world scenarios, we want to build the containing JDK at the 'release'
    # debug level.
    DEBUG_LEVEL="release"
  fi

  AC_SUBST(HOTSPOT_DEBUG_LEVEL)
  AC_SUBST(DEBUG_LEVEL)
])

###############################################################################
#
# Should we build only OpenJDK even if closed sources are present?
#
AC_DEFUN_ONCE([JDKOPT_SETUP_OPEN_OR_CUSTOM],
[
  AC_ARG_ENABLE([openjdk-only], [AS_HELP_STRING([--enable-openjdk-only],
      [suppress building custom source even if present @<:@disabled@:>@])],,[enable_openjdk_only="no"])

  AC_MSG_CHECKING([if custom source is suppressed (openjdk-only)])
  AC_MSG_RESULT([$enable_openjdk_only])
  if test "x$enable_openjdk_only" = "xyes"; then
    SUPPRESS_CUSTOM_EXTENSIONS="true"
  elif test "x$enable_openjdk_only" = "xno"; then
    SUPPRESS_CUSTOM_EXTENSIONS="false"
  else
    AC_MSG_ERROR([Invalid value for --enable-openjdk-only: $enable_openjdk_only])
  fi

  # custom-make-dir is deprecated. Please use your custom-hook.m4 to override
  # the IncludeCustomExtension macro.
  BASIC_DEPRECATED_ARG_WITH(custom-make-dir)
])

AC_DEFUN_ONCE([JDKOPT_SETUP_JDK_OPTIONS],
[
  # Should we build a JDK without a graphical UI?
  AC_MSG_CHECKING([headless only])
  AC_ARG_ENABLE([headless-only], [AS_HELP_STRING([--enable-headless-only],
      [only build headless (no GUI) support @<:@disabled@:>@])])

  if test "x$enable_headless_only" = "xyes"; then
    ENABLE_HEADLESS_ONLY="true"
    AC_MSG_RESULT([yes])
  elif test "x$enable_headless_only" = "xno"; then
    ENABLE_HEADLESS_ONLY="false"
    AC_MSG_RESULT([no])
  elif test "x$enable_headless_only" = "x"; then
    ENABLE_HEADLESS_ONLY="false"
    AC_MSG_RESULT([no])
  else
    AC_MSG_ERROR([--enable-headless-only can only take yes or no])
  fi

  AC_SUBST(ENABLE_HEADLESS_ONLY)

  # Should we build the complete docs, or just a lightweight version?
  AC_ARG_ENABLE([full-docs], [AS_HELP_STRING([--enable-full-docs],
      [build complete documentation @<:@enabled if all tools found@:>@])])

  # Verify dependencies
  AC_MSG_CHECKING([for graphviz dot])
  if test "x$DOT" != "x"; then
    AC_MSG_RESULT([yes])
  else
    AC_MSG_RESULT([no, cannot generate full docs])
    FULL_DOCS_DEP_MISSING=true
  fi

  AC_MSG_CHECKING([for pandoc])
  if test "x$PANDOC" != "x"; then
    AC_MSG_RESULT([yes])
  else
    AC_MSG_RESULT([no, cannot generate full docs])
    FULL_DOCS_DEP_MISSING=true
  fi

  AC_MSG_CHECKING([full docs])
  if test "x$enable_full_docs" = xyes; then
    if test "x$FULL_DOCS_DEP_MISSING" = "xtrue"; then
      AC_MSG_RESULT([no, missing dependencies])
      HELP_MSG_MISSING_DEPENDENCY([dot])
      AC_MSG_ERROR([Cannot enable full docs with missing dependencies. See above. $HELP_MSG])
    else
      ENABLE_FULL_DOCS=true
      AC_MSG_RESULT([yes, forced])
    fi
  elif test "x$enable_full_docs" = xno; then
    ENABLE_FULL_DOCS=false
    AC_MSG_RESULT([no, forced])
  elif test "x$enable_full_docs" = x; then
    # Check for prerequisites
    if test "x$FULL_DOCS_DEP_MISSING" = xtrue; then
      ENABLE_FULL_DOCS=false
      AC_MSG_RESULT([no, missing dependencies])
    else
      ENABLE_FULL_DOCS=true
      AC_MSG_RESULT([yes, dependencies present])
    fi
  else
    AC_MSG_ERROR([--enable-full-docs can only take yes or no])
  fi

  AC_SUBST(ENABLE_FULL_DOCS)

  # Choose cacerts source file
  AC_ARG_WITH(cacerts-file, [AS_HELP_STRING([--with-cacerts-file],
      [specify alternative cacerts file])])
  AC_MSG_CHECKING([for cacerts file])
  if test "x$with_cacerts_file" == x; then
    AC_MSG_RESULT([default])
  else
    CACERTS_FILE=$with_cacerts_file
    if test ! -f "$CACERTS_FILE"; then
      AC_MSG_RESULT([fail])
      AC_MSG_ERROR([Specified cacerts file "$CACERTS_FILE" does not exist])
    fi
    AC_MSG_RESULT([$CACERTS_FILE])
  fi
  AC_SUBST(CACERTS_FILE)

  # Enable or disable unlimited crypto
  AC_ARG_ENABLE(unlimited-crypto, [AS_HELP_STRING([--disable-unlimited-crypto],
      [Disable unlimited crypto policy @<:@enabled@:>@])],,
      [enable_unlimited_crypto=yes])
  if test "x$enable_unlimited_crypto" = "xyes"; then
    UNLIMITED_CRYPTO=true
  else
    UNLIMITED_CRYPTO=false
  fi
  AC_SUBST(UNLIMITED_CRYPTO)

  # Should we build the serviceability agent (SA)?
  INCLUDE_SA=true
  if HOTSPOT_CHECK_JVM_VARIANT(zero) || HOTSPOT_CHECK_JVM_VARIANT(zeroshark); then
    INCLUDE_SA=false
  fi
  if test "x$OPENJDK_TARGET_OS" = xaix ; then
    INCLUDE_SA=false
  fi
  AC_SUBST(INCLUDE_SA)

  # Compress jars
  COMPRESS_JARS=false

  AC_SUBST(COMPRESS_JARS)

  # Setup default copyright year. Mostly overridden when building close to a new year.
  AC_ARG_WITH(copyright-year, [AS_HELP_STRING([--with-copyright-year],
      [Set copyright year value for build @<:@current year@:>@])])
  if test "x$with_copyright_year" = xyes; then
    AC_MSG_ERROR([Copyright year must have a value])
  elif test "x$with_copyright_year" != x; then
    COPYRIGHT_YEAR="$with_copyright_year"
  else
    COPYRIGHT_YEAR=`$DATE +'%Y'`
  fi
  AC_SUBST(COPYRIGHT_YEAR)
])

###############################################################################
#
# Enable or disable the elliptic curve crypto implementation
#
AC_DEFUN_ONCE([JDKOPT_DETECT_INTREE_EC],
[
  AC_MSG_CHECKING([if elliptic curve crypto implementation is present])

  if test -d "${TOPDIR}/src/jdk.crypto.ec/share/native/libsunec/impl"; then
    ENABLE_INTREE_EC=true
    AC_MSG_RESULT([yes])
  else
    ENABLE_INTREE_EC=false
    AC_MSG_RESULT([no])
  fi

  AC_SUBST(ENABLE_INTREE_EC)
])

AC_DEFUN_ONCE([JDKOPT_SETUP_DEBUG_SYMBOLS],
[
  #
  # NATIVE_DEBUG_SYMBOLS
  # This must be done after the toolchain is setup, since we're looking at objcopy.
  #
  AC_MSG_CHECKING([what type of native debug symbols to use])
  AC_ARG_WITH([native-debug-symbols],
      [AS_HELP_STRING([--with-native-debug-symbols],
      [set the native debug symbol configuration (none, internal, external, zipped) @<:@varying@:>@])],
      [
        if test "x$OPENJDK_TARGET_OS" = xaix; then
          if test "x$withval" = xexternal || test "x$withval" = xzipped; then
            AC_MSG_ERROR([AIX only supports the parameters 'none' and 'internal' for --with-native-debug-symbols])
          fi
        fi
      ],
      [
        if test "x$OPENJDK_TARGET_OS" = xaix; then
          # AIX doesn't support 'zipped' so use 'internal' as default
          with_native_debug_symbols="internal"
        else
          if test "x$STATIC_BUILD" = xtrue; then
            with_native_debug_symbols="none"
          else
            with_native_debug_symbols="zipped"
          fi
        fi
      ])
  NATIVE_DEBUG_SYMBOLS=$with_native_debug_symbols
  AC_MSG_RESULT([$NATIVE_DEBUG_SYMBOLS])

  if test "x$NATIVE_DEBUG_SYMBOLS" = xzipped; then

    if test "x$OPENJDK_TARGET_OS" = xsolaris || test "x$OPENJDK_TARGET_OS" = xlinux; then
      if test "x$OBJCOPY" = x; then
        # enabling of enable-debug-symbols and can't find objcopy
        # this is an error
        AC_MSG_ERROR([Unable to find objcopy, cannot enable native debug symbols])
      fi
    fi

    COMPILE_WITH_DEBUG_SYMBOLS=true
    COPY_DEBUG_SYMBOLS=true
    ZIP_EXTERNAL_DEBUG_SYMBOLS=true
  elif test "x$NATIVE_DEBUG_SYMBOLS" = xnone; then
    COMPILE_WITH_DEBUG_SYMBOLS=false
    COPY_DEBUG_SYMBOLS=false
    ZIP_EXTERNAL_DEBUG_SYMBOLS=false
  elif test "x$NATIVE_DEBUG_SYMBOLS" = xinternal; then
    COMPILE_WITH_DEBUG_SYMBOLS=true
    COPY_DEBUG_SYMBOLS=false
    ZIP_EXTERNAL_DEBUG_SYMBOLS=false
  elif test "x$NATIVE_DEBUG_SYMBOLS" = xexternal; then

    if test "x$OPENJDK_TARGET_OS" = xsolaris || test "x$OPENJDK_TARGET_OS" = xlinux; then
      if test "x$OBJCOPY" = x; then
        # enabling of enable-debug-symbols and can't find objcopy
        # this is an error
        AC_MSG_ERROR([Unable to find objcopy, cannot enable native debug symbols])
      fi
    fi

    COMPILE_WITH_DEBUG_SYMBOLS=true
    COPY_DEBUG_SYMBOLS=true
    ZIP_EXTERNAL_DEBUG_SYMBOLS=false
  else
    AC_MSG_ERROR([Allowed native debug symbols are: none, internal, external, zipped])
  fi

  # --enable-debug-symbols is deprecated.
  # Please use --with-native-debug-symbols=[internal,external,zipped] .
  BASIC_DEPRECATED_ARG_ENABLE(debug-symbols, debug_symbols,
        [Please use --with-native-debug-symbols=[[internal,external,zipped]] .])

  # --enable-zip-debug-info is deprecated.
  # Please use --with-native-debug-symbols=zipped .
  BASIC_DEPRECATED_ARG_ENABLE(zip-debug-info, zip_debug_info,
                              [Please use --with-native-debug-symbols=zipped .])

  AC_SUBST(COMPILE_WITH_DEBUG_SYMBOLS)
  AC_SUBST(COPY_DEBUG_SYMBOLS)
  AC_SUBST(ZIP_EXTERNAL_DEBUG_SYMBOLS)
])

################################################################################
#
# Gcov coverage data for hotspot
#
AC_DEFUN_ONCE([JDKOPT_SETUP_CODE_COVERAGE],
[
  AC_ARG_ENABLE(native-coverage, [AS_HELP_STRING([--enable-native-coverage],
      [enable native compilation with code coverage data@<:@disabled@:>@])])
  GCOV_ENABLED="false"
  if test "x$enable_native_coverage" = "xyes"; then
    if test "x$TOOLCHAIN_TYPE" = "xgcc"; then
      AC_MSG_CHECKING([if native coverage is enabled])
      AC_MSG_RESULT([yes])
      GCOV_CFLAGS="-fprofile-arcs -ftest-coverage -fno-inline"
      GCOV_LDFLAGS="-fprofile-arcs"
      JVM_CFLAGS="$JVM_CFLAGS $GCOV_CFLAGS"
      JVM_LDFLAGS="$JVM_LDFLAGS $GCOV_LDFLAGS"
      CFLAGS_JDKLIB="$CFLAGS_JDKLIB $GCOV_CFLAGS"
      CFLAGS_JDKEXE="$CFLAGS_JDKEXE $GCOV_CFLAGS"
      CXXFLAGS_JDKLIB="$CXXFLAGS_JDKLIB $GCOV_CFLAGS"
      CXXFLAGS_JDKEXE="$CXXFLAGS_JDKEXE $GCOV_CFLAGS"
      LDFLAGS_JDKLIB="$LDFLAGS_JDKLIB $GCOV_LDFLAGS"
      LDFLAGS_JDKEXE="$LDFLAGS_JDKEXE $GCOV_LDFLAGS"
      GCOV_ENABLED="true"
    else
      AC_MSG_ERROR([--enable-native-coverage only works with toolchain type gcc])
    fi
  elif test "x$enable_native_coverage" = "xno"; then
    AC_MSG_CHECKING([if native coverage is enabled])
    AC_MSG_RESULT([no])
  elif test "x$enable_native_coverage" != "x"; then
    AC_MSG_ERROR([--enable-native-coverage can only be assigned "yes" or "no"])
  fi

  AC_SUBST(GCOV_ENABLED)
])

###############################################################################
#
# AddressSanitizer
#
AC_DEFUN_ONCE([JDKOPT_SETUP_ADDRESS_SANITIZER],
[
  AC_ARG_ENABLE(asan, [AS_HELP_STRING([--enable-asan],
      [enable AddressSanitizer if possible @<:@disabled@:>@])])
  ASAN_ENABLED="no"
  if test "x$enable_asan" = "xyes"; then
    case $TOOLCHAIN_TYPE in
      gcc | clang)
        AC_MSG_CHECKING([if asan is enabled])
        AC_MSG_RESULT([yes])
        ASAN_CFLAGS="-fsanitize=address -fno-omit-frame-pointer"
        ASAN_LDFLAGS="-fsanitize=address"
        JVM_CFLAGS="$JVM_CFLAGS $ASAN_CFLAGS"
        JVM_LDFLAGS="$JVM_LDFLAGS $ASAN_LDFLAGS"
        CFLAGS_JDKLIB="$CFLAGS_JDKLIB $ASAN_CFLAGS"
        CFLAGS_JDKEXE="$CFLAGS_JDKEXE $ASAN_CFLAGS"
        CXXFLAGS_JDKLIB="$CXXFLAGS_JDKLIB $ASAN_CFLAGS"
        CXXFLAGS_JDKEXE="$CXXFLAGS_JDKEXE $ASAN_CFLAGS"
        LDFLAGS_JDKLIB="$LDFLAGS_JDKLIB $ASAN_LDFLAGS"
        LDFLAGS_JDKEXE="$LDFLAGS_JDKEXE $ASAN_LDFLAGS"
        ASAN_ENABLED="yes"
        ;;
      *)
        AC_MSG_ERROR([--enable-asan only works with toolchain type gcc or clang])
        ;;
    esac
  elif test "x$enable_asan" = "xno"; then
    AC_MSG_CHECKING([if asan is enabled])
    AC_MSG_RESULT([no])
  elif test "x$enable_asan" != "x"; then
    AC_MSG_ERROR([--enable-asan can only be assigned "yes" or "no"])
  fi

  AC_SUBST(ASAN_ENABLED)
])

################################################################################
#
# Static build support.  When enabled will generate static
# libraries instead of shared libraries for all JDK libs.
#
AC_DEFUN_ONCE([JDKOPT_SETUP_STATIC_BUILD],
[
  AC_ARG_ENABLE([static-build], [AS_HELP_STRING([--enable-static-build],
    [enable static library build @<:@disabled@:>@])])
  STATIC_BUILD=false
  if test "x$enable_static_build" = "xyes"; then
    AC_MSG_CHECKING([if static build is enabled])
    AC_MSG_RESULT([yes])
    if test "x$OPENJDK_TARGET_OS" != "xmacosx"; then
      AC_MSG_ERROR([--enable-static-build is only supported for macosx builds])
    fi
    STATIC_BUILD_CFLAGS="-DSTATIC_BUILD=1"
    CFLAGS_JDKLIB_EXTRA="$CFLAGS_JDKLIB_EXTRA $STATIC_BUILD_CFLAGS"
    CXXFLAGS_JDKLIB_EXTRA="$CXXFLAGS_JDKLIB_EXTRA $STATIC_BUILD_CFLAGS"
    STATIC_BUILD=true
  elif test "x$enable_static_build" = "xno"; then
    AC_MSG_CHECKING([if static build is enabled])
    AC_MSG_RESULT([no])
  elif test "x$enable_static_build" != "x"; then
    AC_MSG_ERROR([--enable-static-build can only be assigned "yes" or "no"])
  fi

  AC_SUBST(STATIC_BUILD)
])

################################################################################
#
# jlink options.
# We always keep packaged modules in JDK image.
#
AC_DEFUN_ONCE([JDKOPT_SETUP_JLINK_OPTIONS],
[
  AC_ARG_ENABLE([keep-packaged-modules], [AS_HELP_STRING([--disable-keep-packaged-modules],
    [Do not keep packaged modules in jdk image @<:@enable@:>@])])

  AC_MSG_CHECKING([if packaged modules are kept])
  if test "x$enable_keep_packaged_modules" = "xyes"; then
    AC_MSG_RESULT([yes])
    JLINK_KEEP_PACKAGED_MODULES=true
  elif test "x$enable_keep_packaged_modules" = "xno"; then
    AC_MSG_RESULT([no])
    JLINK_KEEP_PACKAGED_MODULES=false
  elif test "x$enable_keep_packaged_modules" = "x"; then
    AC_MSG_RESULT([yes (default)])
    JLINK_KEEP_PACKAGED_MODULES=true
  else
    AC_MSG_RESULT([error])
    AC_MSG_ERROR([--enable-keep-packaged-modules accepts no argument])
  fi

  AC_SUBST(JLINK_KEEP_PACKAGED_MODULES)
])

################################################################################
#
# Check if building of the jtreg failure handler should be enabled.
#
AC_DEFUN_ONCE([JDKOPT_ENABLE_DISABLE_FAILURE_HANDLER],
[
  AC_ARG_ENABLE([jtreg-failure-handler], [AS_HELP_STRING([--enable-jtreg-failure-handler],
    [forces build of the jtreg failure handler to be enabled, missing dependencies
     become fatal errors. Default is auto, where the failure handler is built if all
     dependencies are present and otherwise just disabled.])])

  AC_MSG_CHECKING([if jtreg failure handler should be built])

  if test "x$enable_jtreg_failure_handler" = "xyes"; then
    if test "x$JT_HOME" = "x"; then
      AC_MSG_ERROR([Cannot enable jtreg failure handler without jtreg.])
    else
      BUILD_FAILURE_HANDLER=true
      AC_MSG_RESULT([yes, forced])
    fi
  elif test "x$enable_jtreg_failure_handler" = "xno"; then
    BUILD_FAILURE_HANDLER=false
    AC_MSG_RESULT([no, forced])
  elif test "x$enable_jtreg_failure_handler" = "xauto" \
      || test "x$enable_jtreg_failure_handler" = "x"; then
    if test "x$JT_HOME" = "x"; then
      BUILD_FAILURE_HANDLER=false
      AC_MSG_RESULT([no, missing jtreg])
    else
      BUILD_FAILURE_HANDLER=true
      AC_MSG_RESULT([yes, jtreg present])
    fi
  else
    AC_MSG_ERROR([Invalid value for --enable-jtreg-failure-handler: $enable_jtreg_failure_handler])
  fi

  AC_SUBST(BUILD_FAILURE_HANDLER)
])

################################################################################
#
# Enable or disable generation of the classlist at build time
#
AC_DEFUN_ONCE([JDKOPT_ENABLE_DISABLE_GENERATE_CLASSLIST],
[
  AC_ARG_ENABLE([generate-classlist], [AS_HELP_STRING([--disable-generate-classlist],
      [forces enabling or disabling of the generation of a CDS classlist at build time.
      Default is to generate it when either the server or client JVMs are built and
      enable-cds is true.])])

  # Check if it's likely that it's possible to generate the classlist. Depending
  # on exact jvm configuration it could be possible anyway.
  if test "x$ENABLE_CDS" = "xtrue" && (HOTSPOT_CHECK_JVM_VARIANT(server) || HOTSPOT_CHECK_JVM_VARIANT(client)); then
    ENABLE_GENERATE_CLASSLIST_POSSIBLE="true"
  else
    ENABLE_GENERATE_CLASSLIST_POSSIBLE="false"
  fi

  AC_MSG_CHECKING([if the CDS classlist generation should be enabled])
  if test "x$enable_generate_classlist" = "xyes"; then
    AC_MSG_RESULT([yes, forced])
    ENABLE_GENERATE_CLASSLIST="true"
    if test "x$ENABLE_GENERATE_CLASSLIST_POSSIBLE" = "xfalse"; then
      AC_MSG_WARN([Generation of classlist might not be possible with JVM Variants $JVM_VARIANTS and enable-cds=$ENABLE_CDS])
    fi
  elif test "x$enable_generate_classlist" = "xno"; then
    AC_MSG_RESULT([no, forced])
    ENABLE_GENERATE_CLASSLIST="false"
  elif test "x$enable_generate_classlist" = "x"; then
    if test "x$ENABLE_GENERATE_CLASSLIST_POSSIBLE" = "xtrue"; then
      AC_MSG_RESULT([yes])
      ENABLE_GENERATE_CLASSLIST="true"
    else
      AC_MSG_RESULT([no])
      ENABLE_GENERATE_CLASSLIST="false"
    fi
  else
    AC_MSG_ERROR([Invalid value for --enable-generate-classlist: $enable_generate_classlist])
  fi

  AC_SUBST(ENABLE_GENERATE_CLASSLIST)
])