toolchain.m4

#
# Copyright (c) 2011, 2018, 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.
#

# Prepare the system so that TOOLCHAIN_CHECK_COMPILER_VERSION can be called.
# Must have CC_VERSION_NUMBER and CXX_VERSION_NUMBER.
AC_DEFUN([TOOLCHAIN_PREPARE_FOR_VERSION_COMPARISONS],
[
  if test "x$CC_VERSION" != "x$CXX_VERSION"; then
    AC_MSG_WARN([C and C++ compiler has different version numbers, $CC_VERSION vs $CXX_VERSION.])
    AC_MSG_WARN([This typically indicates a broken setup, and is not supported])
  fi

  # We only check CC_VERSION since we assume CXX_VERSION is equal.
  if [ [[ "$CC_VERSION" =~ (.*\.){3} ]] ]; then
    AC_MSG_WARN([C compiler version number has more than three parts (X.Y.Z): $CC_VERSION. Comparisons might be wrong.])
  fi

  if [ [[  "$CC_VERSION" =~ [0-9]{6} ]] ]; then
    AC_MSG_WARN([C compiler version number has a part larger than 99999: $CC_VERSION. Comparisons might be wrong.])
  fi

  COMPARABLE_ACTUAL_VERSION=`$AWK -F. '{ printf("%05d%05d%05d\n", [$]1, [$]2, [$]3) }' <<< "$CC_VERSION"`
])

# Check if the configured compiler (C and C++) is of a specific version or
# newer. TOOLCHAIN_PREPARE_FOR_VERSION_COMPARISONS must have been called before.
#
# Arguments:
#   $1:   The version string to check against the found version
#   $2:   block to run if the compiler is at least this version (>=)
#   $3:   block to run if the compiler is older than this version (<)
AC_DEFUN([TOOLCHAIN_CHECK_COMPILER_VERSION],
[
  REFERENCE_VERSION=$1

  if [ [[ "$REFERENCE_VERSION" =~ (.*\.){3} ]] ]; then
    AC_MSG_ERROR([Internal error: Cannot compare to $REFERENCE_VERSION, only three parts (X.Y.Z) is supported])
  fi

  if [ [[ "$REFERENCE_VERSION" =~ [0-9]{6} ]] ]; then
    AC_MSG_ERROR([Internal error: Cannot compare to $REFERENCE_VERSION, only parts < 99999 is supported])
  fi

  # Version comparison method inspired by http://stackoverflow.com/a/24067243
  COMPARABLE_REFERENCE_VERSION=`$AWK -F. '{ printf("%05d%05d%05d\n", [$]1, [$]2, [$]3) }' <<< "$REFERENCE_VERSION"`

  if test $COMPARABLE_ACTUAL_VERSION -ge $COMPARABLE_REFERENCE_VERSION ; then
    m4_ifval([$2], [$2], [:])
  else
    m4_ifval([$3], [$3], [:])
  fi
])

# $1 = compiler to test (CC or CXX)
# $2 = human readable name of compiler (C or C++)
AC_DEFUN([TOOLCHAIN_EXTRACT_COMPILER_VERSION],
[
  COMPILER=[$]$1
  COMPILER_NAME=$2

  if test "x$OPENJDK_TARGET_OS" = xsolaris; then
    # Make sure we use the Sun Studio compiler and not gcc on Solaris, which won't work
    COMPILER_VERSION_TEST=`$COMPILER -V 2>&1 | $HEAD -n 1`
    $ECHO $COMPILER_VERSION_TEST | $GREP "^.*: Sun $COMPILER_NAME" > /dev/null
    if test $? -ne 0; then
      GCC_VERSION_TEST=`$COMPILER --version 2>&1 | $HEAD -n 1`

      AC_MSG_NOTICE([The $COMPILER_NAME compiler (located as $COMPILER) does not seem to be the required Sun Studio compiler.])
      AC_MSG_NOTICE([The result from running with -V was: "$COMPILER_VERSION_TEST" and with --version: "$GCC_VERSION_TEST"])
      AC_MSG_ERROR([Sun Studio compiler is required. Try setting --with-tools-dir.])
    else
      COMPILER_VERSION=`$ECHO $COMPILER_VERSION_TEST | $SED -n "s/^.*@<:@ ,\t@:>@$COMPILER_NAME@<:@ ,\t@:>@\(@<:@1-9@:>@\.@<:@0-9@:>@@<:@0-9@:>@*\).*/\1/p"`
      COMPILER_VENDOR="Sun Studio"
    fi
  elif test  "x$OPENJDK_TARGET_OS" = xaix; then
      COMPILER_VERSION_TEST=`$COMPILER -qversion  2>&1 | $TAIL -n 1`
      $ECHO $COMPILER_VERSION_TEST | $GREP "^Version: " > /dev/null
      if test $? -ne 0; then
        AC_MSG_ERROR([Failed to detect the compiler version of $COMPILER ....])
      else
        COMPILER_VERSION=`$ECHO $COMPILER_VERSION_TEST | $SED -n 's/Version: \([0-9][0-9]\.[0-9][0-9]*\).*/\1/p'`
        COMPILER_VENDOR='IBM'
      fi
  elif test  "x$OPENJDK_TARGET_OS" = xwindows; then
    # First line typically looks something like:
    # Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.40219.01 for 80x86
    COMPILER_VERSION_TEST=`$COMPILER 2>&1 | $HEAD -n 1 | $TR -d '\r'`
    COMPILER_VERSION=`$ECHO $COMPILER_VERSION_TEST | $SED -n "s/^.*Version \(@<:@1-9@:>@@<:@0-9.@:>@*\) .*/\1/p"`
    COMPILER_VENDOR="Microsoft CL.EXE"
    COMPILER_CPU_TEST=`$ECHO $COMPILER_VERSION_TEST | $SED -n "s/^.* for \(.*\)$/\1/p"`
    if test "x$OPENJDK_TARGET_CPU" = "xx86"; then
      if test "x$COMPILER_CPU_TEST" != "x80x86"; then
        AC_MSG_ERROR([Target CPU mismatch. We are building for $OPENJDK_TARGET_CPU but CL is for "$COMPILER_CPU_TEST"; expected "80x86".])
      fi
    elif test "x$OPENJDK_TARGET_CPU" = "xx86_64"; then
      if test "x$COMPILER_CPU_TEST" != "xx64"; then
        AC_MSG_ERROR([Target CPU mismatch. We are building for $OPENJDK_TARGET_CPU but CL is for "$COMPILER_CPU_TEST"; expected "x64".])
      fi
    fi
  else
    COMPILER_VERSION_TEST=`$COMPILER --version 2>&1 | $HEAD -n 1`
    # Check that this is likely to be GCC.
    $COMPILER --version 2>&1 | $GREP "Free Software Foundation" > /dev/null
    if test $? -ne 0; then
      AC_MSG_NOTICE([The $COMPILER_NAME compiler (located as $COMPILER) does not seem to be the required GCC compiler.])
      AC_MSG_NOTICE([The result from running with --version was: "$COMPILER_VERSION_TEST"])
      AC_MSG_ERROR([GCC compiler is required. Try setting --with-tools-dir.])
    fi

    # First line typically looks something like:
    # gcc (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2
    COMPILER_VERSION=`$ECHO $COMPILER_VERSION_TEST | \
        $SED -e 's/^.* \(@<:@1-9@:>@\.@<:@0-9.@:>@*\)@<:@^0-9.@:>@.*$/\1/'`
    COMPILER_VENDOR=`$ECHO $COMPILER_VERSION_TEST | $SED -n "s/^\(.*\) @<:@1-9@:>@@<:@0-9.@:>@*/\1/p"`
  fi
  # This sets CC_VERSION or CXX_VERSION. (This comment is a grep marker)
  $1_VERSION="$COMPILER_VERSION"
  # This sets CC_VENDOR or CXX_VENDOR. (This comment is a grep marker)
  $1_VENDOR="$COMPILER_VENDOR"

  AC_MSG_NOTICE([Using $COMPILER_VENDOR $COMPILER_NAME compiler version $COMPILER_VERSION (located at $COMPILER)])
])


AC_DEFUN_ONCE([TOOLCHAIN_SETUP_SYSROOT_AND_OUT_OPTIONS],
[
  ###############################################################################
  #
  # Configure the development tool paths and potential sysroot.
  #
  AC_LANG(C++)

  # The option used to specify the target .o,.a or .so file.
  # When compiling, how to specify the to be created object file.
  CC_OUT_OPTION='-o$(SPACE)'
  # When linking, how to specify the to be created executable.
  EXE_OUT_OPTION='-o$(SPACE)'
  # When linking, how to specify the to be created dynamically linkable library.
  LD_OUT_OPTION='-o$(SPACE)'
  # When archiving, how to specify the to be create static archive for object files.
  AR_OUT_OPTION='rcs$(SPACE)'
  AC_SUBST(CC_OUT_OPTION)
  AC_SUBST(EXE_OUT_OPTION)
  AC_SUBST(LD_OUT_OPTION)
  AC_SUBST(AR_OUT_OPTION)
])

# $1 = compiler to test (CC or CXX)
# $2 = human readable name of compiler (C or C++)
# $3 = list of compiler names to search for
AC_DEFUN([TOOLCHAIN_FIND_COMPILER],
[
  COMPILER_NAME=$2

  $1=
  # If TOOLS_DIR is set, check for all compiler names in there first
  # before checking the rest of the PATH.
  if test -n "$TOOLS_DIR"; then
    PATH_save="$PATH"
    PATH="$TOOLS_DIR"
    AC_PATH_PROGS(TOOLS_DIR_$1, $3)
    $1=$TOOLS_DIR_$1
    PATH="$PATH_save"
  fi

  # AC_PATH_PROGS can't be run multiple times with the same variable,
  # so create a new name for this run.
  if test "x[$]$1" = x; then
    AC_PATH_PROGS(POTENTIAL_$1, $3)
    $1=$POTENTIAL_$1
  fi

  if test "x[$]$1" = x; then
    HELP_MSG_MISSING_DEPENDENCY([devkit])
    AC_MSG_ERROR([Could not find a $COMPILER_NAME compiler. $HELP_MSG])
  fi
  BASIC_FIXUP_EXECUTABLE($1)
  TEST_COMPILER="[$]$1"
  # Don't remove symbolic links on AIX because 'xlc_r' and 'xlC_r' may all be links
  # to 'xlc' but it is crucial that we invoke the compiler with the right name!
  if test "x$OPENJDK_BUILD_OS" != xaix; then
    AC_MSG_CHECKING([resolved symbolic links for $1])
    BASIC_REMOVE_SYMBOLIC_LINKS(TEST_COMPILER)
    AC_MSG_RESULT([$TEST_COMPILER])
  fi
  AC_MSG_CHECKING([if $1 is disguised ccache])

  COMPILER_BASENAME=`$BASENAME "$TEST_COMPILER"`
  if test "x$COMPILER_BASENAME" = "xccache"; then
    AC_MSG_RESULT([yes, trying to find proper $COMPILER_NAME compiler])
    # We /usr/lib/ccache in the path, so cc is a symlink to /usr/bin/ccache.
    # We want to control ccache invocation ourselves, so ignore this cc and try
    # searching again.

    # Remove the path to the fake ccache cc from the PATH
    RETRY_COMPILER_SAVED_PATH="$PATH"
    COMPILER_DIRNAME=`$DIRNAME [$]$1`
    PATH="`$ECHO $PATH | $SED -e "s,$COMPILER_DIRNAME,,g" -e "s,::,:,g" -e "s,^:,,g"`"

    # Try again looking for our compiler
    AC_CHECK_TOOLS(PROPER_COMPILER_$1, $3)
    BASIC_FIXUP_EXECUTABLE(PROPER_COMPILER_$1)
    PATH="$RETRY_COMPILER_SAVED_PATH"

    AC_MSG_CHECKING([for resolved symbolic links for $1])
    BASIC_REMOVE_SYMBOLIC_LINKS(PROPER_COMPILER_$1)
    AC_MSG_RESULT([$PROPER_COMPILER_$1])
    $1="$PROPER_COMPILER_$1"
  else
    AC_MSG_RESULT([no, keeping $1])
    $1="$TEST_COMPILER"
  fi
  TOOLCHAIN_EXTRACT_COMPILER_VERSION([$1], [$COMPILER_NAME])
])


AC_DEFUN([TOOLCHAIN_SETUP_PATHS],
[
  if test "x$OPENJDK_TARGET_OS" = "xwindows"; then
    TOOLCHAIN_SETUP_VISUAL_STUDIO_ENV
    TOOLCHAIN_SETUP_MSVCR_DLL
    BASIC_DEPRECATED_ARG_WITH([dxsdk])
    BASIC_DEPRECATED_ARG_WITH([dxsdk-lib])
    BASIC_DEPRECATED_ARG_WITH([dxsdk-include])
  fi

  AC_SUBST(MSVCR_DLL)

  # If --build AND --host is set, then the configure script will find any
  # cross compilation tools in the PATH. Cross compilation tools
  # follows the cross compilation standard where they are prefixed with ${host}.
  # For example the binary i686-sun-solaris2.10-gcc
  # will cross compile for i686-sun-solaris2.10
  # If neither of build and host is not set, then build=host and the
  # default compiler found in the path will be used.
  # Setting only --host, does not seem to be really supported.
  # Please set both --build and --host if you want to cross compile.

  if test "x$COMPILE_TYPE" = "xcross"; then
    # Now we to find a C/C++ compiler that can build executables for the build
    # platform. We can't use the AC_PROG_CC macro, since it can only be used
    # once. Also, we need to do this before adding a tools dir to the path,
    # otherwise we might pick up cross-compilers which don't use standard naming.
    # Otherwise, we'll set the BUILD_tools to the native tools, but that'll have
    # to wait until they are properly discovered.
    AC_PATH_PROGS(BUILD_CC, [cl cc gcc])
    BASIC_FIXUP_EXECUTABLE(BUILD_CC)
    AC_PATH_PROGS(BUILD_CXX, [cl CC g++])
    BASIC_FIXUP_EXECUTABLE(BUILD_CXX)
    AC_PATH_PROG(BUILD_LD, ld)
    BASIC_FIXUP_EXECUTABLE(BUILD_LD)
  fi
  AC_SUBST(BUILD_CC)
  AC_SUBST(BUILD_CXX)
  AC_SUBST(BUILD_LD)

  # If a devkit is found on the builddeps server, then prepend its path to the
  # PATH variable. If there are cross compilers available in the devkit, these
  # will be found by AC_PROG_CC et al.
  DEVKIT=
  BDEPS_CHECK_MODULE(DEVKIT, devkit, xxx,
      [
        # Found devkit
        PATH="$DEVKIT/bin:$PATH"
        SYS_ROOT="$DEVKIT/${rewritten_target}/sys-root"
        if test "x$x_includes" = "xNONE"; then
          x_includes="$SYS_ROOT/usr/include/X11"
        fi
        if test "x$x_libraries" = "xNONE"; then
          x_libraries="$SYS_ROOT/usr/lib"
        fi
      ],
      [])

  # Store the CFLAGS etal passed to the configure script.
  ORG_CFLAGS="$CFLAGS"
  ORG_CXXFLAGS="$CXXFLAGS"
  ORG_OBJCFLAGS="$OBJCFLAGS"

  # autoconf magic only relies on PATH, so update it if tools dir is specified
  OLD_PATH="$PATH"
  if test "x$TOOLS_DIR" != x; then
    PATH=$TOOLS_DIR:$PATH
  fi

  # Before we locate the compilers, we need to sanitize the Xcode build environment
  if test "x$OPENJDK_TARGET_OS" = "xmacosx"; then
    # determine path to Xcode developer directory
    # can be empty in which case all the tools will rely on a sane Xcode 4 installation
    SET_DEVELOPER_DIR=

    if test -n "$XCODE_PATH"; then
      DEVELOPER_DIR="$XCODE_PATH"/Contents/Developer
    fi

    # DEVELOPER_DIR could also be provided directly
    AC_MSG_CHECKING([Determining if we need to set DEVELOPER_DIR])
    if test -n "$DEVELOPER_DIR"; then
      if test ! -d "$DEVELOPER_DIR"; then
        AC_MSG_ERROR([Xcode Developer path does not exist: $DEVELOPER_DIR, please provide a path to the Xcode 4 application bundle using --with-xcode-path])
      fi
      if test ! -f "$DEVELOPER_DIR"/usr/bin/xcodebuild; then
        AC_MSG_ERROR([Xcode Developer path is not valid: $DEVELOPER_DIR, it must point to Contents/Developer inside an Xcode application bundle])
      fi
      # make it visible to all the tools immediately
      export DEVELOPER_DIR
      SET_DEVELOPER_DIR="export DEVELOPER_DIR := $DEVELOPER_DIR"
      AC_MSG_RESULT([yes ($DEVELOPER_DIR)])
    else
      AC_MSG_RESULT([no])
    fi
    AC_SUBST(SET_DEVELOPER_DIR)

    AC_PATH_PROG(XCODEBUILD, xcodebuild)
    if test -z "$XCODEBUILD"; then
      AC_MSG_ERROR([The xcodebuild tool was not found, the Xcode command line tools are required to build on Mac OS X])
    fi

    # Fail-fast: verify we're building on Xcode 4, we cannot build with Xcode 5 or later
    XCODE_VERSION=`$XCODEBUILD -version | grep '^Xcode ' | sed 's/Xcode //'`
    XC_VERSION_PARTS=( ${XCODE_VERSION//./ } )
    if test ! "${XC_VERSION_PARTS[[0]]}" = "4"; then
      AC_MSG_ERROR([Xcode 4 is required to build JDK 8, the version found was $XCODE_VERSION. Use --with-xcode-path to specify the location of Xcode 4 or make Xcode 4 active by using xcode-select.])
    fi

    # Some versions of Xcode 5 command line tools install gcc and g++ as symlinks to
    # clang and clang++, which will break the build. So handle that here if we need to.
    if test -L "/usr/bin/gcc" -o -L "/usr/bin/g++"; then
      # use xcrun to find the real gcc and add it's directory to PATH
      # then autoconf magic will find it
      AC_MSG_NOTICE([Found gcc symlinks to clang in /usr/bin, adding path to real gcc to PATH])
      XCODE_BIN_PATH=$(dirname `xcrun -find gcc`)
      PATH="$XCODE_BIN_PATH":$PATH
    fi

    # Determine appropriate SDKPATH, don't use SDKROOT as it interferes with the stub tools
    AC_MSG_CHECKING([Determining Xcode SDK path])
    # allow SDKNAME to be set to override the default SDK selection
    SDKPATH=`"$XCODEBUILD" -sdk ${SDKNAME:-macosx} -version | grep '^Path: ' | sed 's/Path: //'`
    if test -n "$SDKPATH"; then
      AC_MSG_RESULT([$SDKPATH])
    else
      AC_MSG_RESULT([(none, will use system headers and frameworks)])
    fi
    AC_SUBST(SDKPATH)

    # Perform a basic sanity test
    if test ! -f "$SDKPATH/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h"; then
      AC_MSG_ERROR([Unable to find required framework headers, provide a valid path to Xcode 4 using --with-xcode-path])
    fi

    # if SDKPATH is non-empty then we need to add -isysroot and -iframework for gcc and g++
    if test -n "$SDKPATH"; then
      # We need -isysroot <path> and -iframework<path>/System/Library/Frameworks
      CFLAGS_JDK="${CFLAGS_JDK} -isysroot \"$SDKPATH\" -iframework\"$SDKPATH/System/Library/Frameworks\""
      CXXFLAGS_JDK="${CXXFLAGS_JDK} -isysroot \"$SDKPATH\" -iframework\"$SDKPATH/System/Library/Frameworks\""
      LDFLAGS_JDK="${LDFLAGS_JDK} -isysroot \"$SDKPATH\" -iframework\"$SDKPATH/System/Library/Frameworks\""
    fi
    
    # These always need to be set, or we can't find the frameworks embedded in JavaVM.framework
    # setting this here means it doesn't have to be peppered throughout the forest
    CFLAGS_JDK="$CFLAGS_JDK -F\"$SDKPATH/System/Library/Frameworks/JavaVM.framework/Frameworks\""
    CXXFLAGS_JDK="$CXXFLAGS_JDK -F\"$SDKPATH/System/Library/Frameworks/JavaVM.framework/Frameworks\""
    LDFLAGS_JDK="$LDFLAGS_JDK -F\"$SDKPATH/System/Library/Frameworks/JavaVM.framework/Frameworks\""
  fi

  ### Locate C compiler (CC)

  # On windows, only cl.exe is supported.
  # On Solaris, cc is preferred to gcc.
  # Elsewhere, gcc is preferred to cc.

  if test "x$CC" != x; then
    COMPILER_CHECK_LIST="$CC"
  elif test "x$OPENJDK_TARGET_OS" = "xwindows"; then
    COMPILER_CHECK_LIST="cl"
  elif test "x$OPENJDK_TARGET_OS" = "xsolaris"; then
    COMPILER_CHECK_LIST="cc gcc"
  elif test "x$OPENJDK_TARGET_OS" = "xaix"; then
    # Do not probe for cc on AIX.
    COMPILER_CHECK_LIST="xlc_r"
  else
    COMPILER_CHECK_LIST="gcc cc"
  fi

  TOOLCHAIN_FIND_COMPILER([CC],[C],[$COMPILER_CHECK_LIST])
  # Now that we have resolved CC ourself, let autoconf have its go at it
  AC_PROG_CC([$CC])

  # Option used to tell the compiler whether to create 32- or 64-bit executables
  # Notice that CC contains the full compiler path at this point.
  case $CC in
    *xlc_r) COMPILER_TARGET_BITS_FLAG="-q";;
    *)      COMPILER_TARGET_BITS_FLAG="-m";;
  esac
  AC_SUBST(COMPILER_TARGET_BITS_FLAG)

  ### Locate C++ compiler (CXX)

  if test "x$CXX" != x; then
    COMPILER_CHECK_LIST="$CXX"
  elif test "x$OPENJDK_TARGET_OS" = "xwindows"; then
    COMPILER_CHECK_LIST="cl"
  elif test "x$OPENJDK_TARGET_OS" = "xsolaris"; then
    COMPILER_CHECK_LIST="CC g++"
  elif test "x$OPENJDK_TARGET_OS" = "xaix"; then
    # Do not probe for CC on AIX .
    COMPILER_CHECK_LIST="xlC_r"
  else
    COMPILER_CHECK_LIST="g++ CC"
  fi

  TOOLCHAIN_FIND_COMPILER([CXX],[C++],[$COMPILER_CHECK_LIST])
  # Now that we have resolved CXX ourself, let autoconf have its go at it
  AC_PROG_CXX([$CXX])

  # This is the compiler version number on the form X.Y[.Z]
  AC_SUBST(CC_VERSION)
  AC_SUBST(CXX_VERSION)

  TOOLCHAIN_PREPARE_FOR_VERSION_COMPARISONS

  ### Locate other tools

  if test "x$OPENJDK_TARGET_OS" = xmacosx; then
    AC_PROG_OBJC
    BASIC_FIXUP_EXECUTABLE(OBJC)
  else
    OBJC=
  fi

  # Restore the flags to the user specified values.
  # This is necessary since AC_PROG_CC defaults CFLAGS to "-g -O2"
  CFLAGS="$ORG_CFLAGS"
  CXXFLAGS="$ORG_CXXFLAGS"
  OBJCFLAGS="$ORG_OBJCFLAGS"

  LD="$CC"
  LDEXE="$CC"
  LDCXX="$CXX"
  LDEXECXX="$CXX"
  AC_SUBST(LD)
  # LDEXE is the linker to use, when creating executables.
  AC_SUBST(LDEXE)
  # Linking C++ libraries.
  AC_SUBST(LDCXX)
  # Linking C++ executables.
  AC_SUBST(LDEXECXX)

  if test "x$OPENJDK_TARGET_OS" != xwindows; then
    AC_CHECK_TOOL(AR, ar)
    BASIC_FIXUP_EXECUTABLE(AR)
  fi
  if test "x$OPENJDK_TARGET_OS" = xmacosx; then
    ARFLAGS="-r"
  elif test "x$OPENJDK_TARGET_OS" = xaix; then
    ARFLAGS="-X64"
  else
    ARFLAGS=""
  fi
  AC_SUBST(ARFLAGS)

  # For hotspot, we need these in Windows mixed path; other platforms keep them the same
  HOTSPOT_CXX="$CXX"
  HOTSPOT_LD="$LD"
  AC_SUBST(HOTSPOT_CXX)
  AC_SUBST(HOTSPOT_LD)

  COMPILER_NAME=gcc
  COMPILER_TYPE=CC
  AS_IF([test "x$OPENJDK_TARGET_OS" = xwindows], [
    # For now, assume that we are always compiling using cl.exe.
    CC_OUT_OPTION=-Fo
    EXE_OUT_OPTION=-out:
    LD_OUT_OPTION=-out:
    AR_OUT_OPTION=-out:
    # On Windows, reject /usr/bin/link (as determined in CYGWIN_LINK), which is a cygwin
    # program for something completely different.
    AC_CHECK_PROG([WINLD], [link],[link],,, [$CYGWIN_LINK])
    # Since we must ignore the first found link, WINLD will contain
    # the full path to the link.exe program.
    BASIC_FIXUP_EXECUTABLE(WINLD)
    printf "Windows linker was found at $WINLD\n"
    AC_MSG_CHECKING([if the found link.exe is actually the Visual Studio linker])
    "$WINLD" --version > /dev/null
    if test $? -eq 0 ; then
      AC_MSG_RESULT([no])
      AC_MSG_ERROR([This is the Cygwin link tool. Please check your PATH and rerun configure.])
    else
      AC_MSG_RESULT([yes])
    fi
    LD="$WINLD"
    LDEXE="$WINLD"
    LDCXX="$WINLD"
    LDEXECXX="$WINLD"

    AC_CHECK_PROG([MT], [mt], [mt],,, [/usr/bin/mt])
    BASIC_FIXUP_EXECUTABLE(MT)
    # The resource compiler
    AC_CHECK_PROG([RC], [rc], [rc],,, [/usr/bin/rc])
    BASIC_FIXUP_EXECUTABLE(RC)

    # For hotspot, we need these in Windows mixed path,
    # so rewrite them all. Need added .exe suffix.
    HOTSPOT_CXX="$CXX.exe"
    HOTSPOT_LD="$LD.exe"
    HOTSPOT_MT="$MT.exe"
    HOTSPOT_RC="$RC.exe"
    BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH(HOTSPOT_CXX)
    BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH(HOTSPOT_LD)
    BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH(HOTSPOT_MT)
    BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH(HOTSPOT_RC)
    AC_SUBST(HOTSPOT_MT)
    AC_SUBST(HOTSPOT_RC)

    RC_FLAGS="-nologo -l 0x409 -r"
    AS_IF([test "x$VARIANT" = xOPT], [
    RC_FLAGS="$RC_FLAGS -d NDEBUG"
  ])

  # The version variables used to create RC_FLAGS may be overridden
  # in a custom configure script, or possibly the command line.
  # Let those variables be expanded at make time in spec.gmk.
  # The \$ are escaped to the shell, and the $(...) variables
  # are evaluated by make.
  RC_FLAGS="$RC_FLAGS \
      -d \"JDK_BUILD_ID=\$(FULL_VERSION)\" \
      -d \"JDK_COMPANY=\$(COMPANY_NAME)\" \
      -d \"JDK_COMPONENT=\$(PRODUCT_NAME) \$(JDK_RC_PLATFORM_NAME) binary\" \
      -d \"JDK_VER=\$(JDK_MINOR_VERSION).\$(JDK_MICRO_VERSION).\$(COOKED_JDK_UPDATE_VERSION).\$(COOKED_BUILD_NUMBER)\" \
      -d \"JDK_COPYRIGHT=Copyright \xA9 $COPYRIGHT_YEAR\" \
      -d \"JDK_NAME=\$(PRODUCT_NAME) \$(JDK_RC_PLATFORM_NAME) \$(JDK_MINOR_VERSION) \$(JDK_UPDATE_META_TAG)\" \
      -d \"JDK_FVER=\$(JDK_MINOR_VERSION),\$(JDK_MICRO_VERSION),\$(COOKED_JDK_UPDATE_VERSION),\$(COOKED_BUILD_NUMBER)\""

  # lib.exe is used to create static libraries.
  AC_CHECK_PROG([WINAR], [lib],[lib],,,)
  BASIC_FIXUP_EXECUTABLE(WINAR)
  AR="$WINAR"
  ARFLAGS="-nologo -NODEFAULTLIB:MSVCRT"

  AC_CHECK_PROG([DUMPBIN], [dumpbin], [dumpbin],,,)
      BASIC_FIXUP_EXECUTABLE(DUMPBIN)

      COMPILER_TYPE=CL
      # silence copyright notice and other headers.
      COMMON_CCXXFLAGS="$COMMON_CCXXFLAGS -nologo"
  ])
  AC_SUBST(RC_FLAGS)
  AC_SUBST(COMPILER_TYPE)

  AC_PROG_CPP
  BASIC_FIXUP_EXECUTABLE(CPP)

  AC_PROG_CXXCPP
  BASIC_FIXUP_EXECUTABLE(CXXCPP)

  if test "x$COMPILE_TYPE" != "xcross"; then
    # If we are not cross compiling, use the same compilers for
    # building the build platform executables. The cross-compilation
    # case needed to be done earlier, but this can only be done after
    # the native tools have been localized.
    BUILD_CC="$CC"
    BUILD_CXX="$CXX"
    BUILD_LD="$LD"
  fi

  # for solaris we really need solaris tools, and not gnu equivalent
  #   these seems to normally reside in /usr/ccs/bin so add that to path before
  #   starting to probe
  #
  #   NOTE: I add this /usr/ccs/bin after TOOLS but before OLD_PATH
  #         so that it can be overriden --with-tools-dir
  if test "x$OPENJDK_BUILD_OS" = xsolaris; then
    PATH="${TOOLS_DIR}:/usr/ccs/bin:${OLD_PATH}"
  fi

  # Find the right assembler.
  if test "x$OPENJDK_TARGET_OS" = xsolaris; then
    AC_PATH_PROG(AS, as)
    BASIC_FIXUP_EXECUTABLE(AS)
  else
    AS="$CC -c"
  fi
  AC_SUBST(AS)

  if test "x$OPENJDK_TARGET_OS" = xsolaris; then
    AC_PATH_PROG(NM, nm)
    BASIC_FIXUP_EXECUTABLE(NM)
    AC_PATH_PROG(GNM, gnm)
    BASIC_FIXUP_EXECUTABLE(GNM)
    AC_PATH_PROG(STRIP, strip)
    BASIC_FIXUP_EXECUTABLE(STRIP)
    AC_PATH_PROG(MCS, mcs)
    BASIC_FIXUP_EXECUTABLE(MCS)
  elif test "x$OPENJDK_TARGET_OS" != xwindows; then
    AC_PATH_PROG(OTOOL, otool)
    if test "x$OTOOL" = "x"; then
      OTOOL="true"
    fi
    AC_CHECK_TOOL(NM, nm)
    BASIC_FIXUP_EXECUTABLE(NM)
    GNM="$NM"
    AC_SUBST(GNM)
    AC_CHECK_TOOL(STRIP, strip)
    BASIC_FIXUP_EXECUTABLE(STRIP)
  fi

  # objcopy is used for moving debug symbols to separate files when
  # full debug symbols are enabled.
  if test "x$OPENJDK_TARGET_OS" = xsolaris || test "x$OPENJDK_TARGET_OS" = xlinux; then
    AC_CHECK_TOOLS(OBJCOPY, [gobjcopy objcopy])
    # Only call fixup if objcopy was found.
    if test -n "$OBJCOPY"; then
      BASIC_FIXUP_EXECUTABLE(OBJCOPY)
    fi
  fi

  AC_CHECK_TOOLS(OBJDUMP, [gobjdump objdump])
  if test "x$OBJDUMP" != x; then
    # Only used for compare.sh; we can live without it. BASIC_FIXUP_EXECUTABLE bails if argument is missing.
    BASIC_FIXUP_EXECUTABLE(OBJDUMP)
  fi

  TOOLCHAIN_SETUP_JTREG

  # Restore old path without tools dir
  PATH="$OLD_PATH"
])


AC_DEFUN_ONCE([TOOLCHAIN_SETUP_COMPILER_FLAGS_FOR_LIBS],
[

  ###############################################################################
  #
  # How to compile shared libraries.
  #

  if test "x$GCC" = xyes; then
    COMPILER_NAME=gcc
    PICFLAG="-fPIC"
    LIBRARY_PREFIX=lib
    SHARED_LIBRARY='lib[$]1.so'
    STATIC_LIBRARY='lib[$]1.a'
    SHARED_LIBRARY_FLAGS="-shared"
    SHARED_LIBRARY_SUFFIX='.so'
    STATIC_LIBRARY_SUFFIX='.a'
    OBJ_SUFFIX='.o'
    EXE_SUFFIX=''
    SET_SHARED_LIBRARY_NAME='-Xlinker -soname=[$]1'
    SET_SHARED_LIBRARY_MAPFILE='-Xlinker -version-script=[$]1'
    C_FLAG_REORDER=''
    CXX_FLAG_REORDER=''
    SET_SHARED_LIBRARY_ORIGIN='-Xlinker -z -Xlinker origin -Xlinker -rpath -Xlinker \$$$$ORIGIN[$]1'
    SET_EXECUTABLE_ORIGIN='-Xlinker -rpath -Xlinker \$$$$ORIGIN[$]1'
    LD="$CC"
    LDEXE="$CC"
    LDCXX="$CXX"
    LDEXECXX="$CXX"
    POST_STRIP_CMD="$STRIP -g"

    # Linking is different on MacOSX
    if test "x$OPENJDK_TARGET_OS" = xmacosx; then
      # Might change in the future to clang.
      COMPILER_NAME=gcc
      SHARED_LIBRARY='lib[$]1.dylib'
      SHARED_LIBRARY_FLAGS="-dynamiclib -compatibility_version 1.0.0 -current_version 1.0.0 $PICFLAG"
      SHARED_LIBRARY_SUFFIX='.dylib'
      EXE_SUFFIX=''
      SET_SHARED_LIBRARY_NAME='-Xlinker -install_name -Xlinker @rpath/[$]1'
      SET_SHARED_LIBRARY_MAPFILE=''
      SET_SHARED_LIBRARY_ORIGIN='-Xlinker -rpath -Xlinker @loader_path/.'
      SET_EXECUTABLE_ORIGIN="$SET_SHARED_LIBRARY_ORIGIN"
      POST_STRIP_CMD="$STRIP -S"
    fi
  else
    if test "x$OPENJDK_TARGET_OS" = xsolaris; then
      # If it is not gcc, then assume it is the Oracle Solaris Studio Compiler
      COMPILER_NAME=ossc
      PICFLAG="-KPIC"
      LIBRARY_PREFIX=lib
      SHARED_LIBRARY='lib[$]1.so'
      STATIC_LIBRARY='lib[$]1.a'
      SHARED_LIBRARY_FLAGS="-G"
      SHARED_LIBRARY_SUFFIX='.so'
      STATIC_LIBRARY_SUFFIX='.a'
      OBJ_SUFFIX='.o'
      EXE_SUFFIX=''
      SET_SHARED_LIBRARY_NAME=''
      SET_SHARED_LIBRARY_MAPFILE='-M[$]1'
      C_FLAG_REORDER='-xF'
      CXX_FLAG_REORDER='-xF'
      SET_SHARED_LIBRARY_ORIGIN='-R\$$$$ORIGIN[$]1'
      SET_EXECUTABLE_ORIGIN="$SET_SHARED_LIBRARY_ORIGIN"
      CFLAGS_JDK="${CFLAGS_JDK} -D__solaris__"
      CXXFLAGS_JDK="${CXXFLAGS_JDK} -D__solaris__"
      CFLAGS_JDKLIB_EXTRA='-xstrconst'
      POST_STRIP_CMD="$STRIP -x"
      POST_MCS_CMD="$MCS -d -a \"JDK $FULL_VERSION\""
    fi
    if test "x$OPENJDK_TARGET_OS" = xaix; then
        COMPILER_NAME=xlc
        PICFLAG="-qpic=large"
        LIBRARY_PREFIX=lib
        SHARED_LIBRARY='lib[$]1.so'
        STATIC_LIBRARY='lib[$]1.a'
        SHARED_LIBRARY_FLAGS="-qmkshrobj"
        SHARED_LIBRARY_SUFFIX='.so'
        STATIC_LIBRARY_SUFFIX='.a'
        OBJ_SUFFIX='.o'
        EXE_SUFFIX=''
        SET_SHARED_LIBRARY_NAME=''
        SET_SHARED_LIBRARY_MAPFILE=''
        C_FLAG_REORDER=''
        CXX_FLAG_REORDER=''
        SET_SHARED_LIBRARY_ORIGIN=''
        SET_EXECUTABLE_ORIGIN=""
        CFLAGS_JDK=""
        CXXFLAGS_JDK=""
        CFLAGS_JDKLIB_EXTRA=''
        POST_STRIP_CMD="$STRIP -X32_64"
        POST_MCS_CMD=""
    fi
    if test "x$OPENJDK_TARGET_OS" = xwindows; then
      # If it is not gcc, then assume it is the MS Visual Studio compiler
      COMPILER_NAME=cl
      PICFLAG=""
      LIBRARY_PREFIX=
      SHARED_LIBRARY='[$]1.dll'
      STATIC_LIBRARY='[$]1.lib'
      SHARED_LIBRARY_FLAGS="-LD"
      SHARED_LIBRARY_SUFFIX='.dll'
      STATIC_LIBRARY_SUFFIX='.lib'
      OBJ_SUFFIX='.obj'
      EXE_SUFFIX='.exe'
      SET_SHARED_LIBRARY_NAME=''
      SET_SHARED_LIBRARY_MAPFILE=''
      SET_SHARED_LIBRARY_ORIGIN=''
      SET_EXECUTABLE_ORIGIN=''
    fi
  fi

  AC_SUBST(COMPILER_NAME)
  AC_SUBST(OBJ_SUFFIX)
  AC_SUBST(SHARED_LIBRARY)
  AC_SUBST(STATIC_LIBRARY)
  AC_SUBST(LIBRARY_PREFIX)
  AC_SUBST(SHARED_LIBRARY_SUFFIX)
  AC_SUBST(STATIC_LIBRARY_SUFFIX)
  AC_SUBST(EXE_SUFFIX)
  AC_SUBST(SHARED_LIBRARY_FLAGS)
  AC_SUBST(SET_SHARED_LIBRARY_NAME)
  AC_SUBST(SET_SHARED_LIBRARY_MAPFILE)
  AC_SUBST(C_FLAG_REORDER)
  AC_SUBST(CXX_FLAG_REORDER)
  AC_SUBST(SET_SHARED_LIBRARY_ORIGIN)
  AC_SUBST(SET_EXECUTABLE_ORIGIN)
  AC_SUBST(POST_STRIP_CMD)
  AC_SUBST(POST_MCS_CMD)

  # The (cross) compiler is now configured, we can now test capabilities
  # of the target platform.
])

AC_DEFUN_ONCE([TOOLCHAIN_SETUP_COMPILER_FLAGS_FOR_OPTIMIZATION],
[

  ###############################################################################
  #
  # Setup the opt flags for different compilers
  # and different operating systems.
  #

  #
  # NOTE: check for -mstackrealign needs to be below potential addition of -m32
  #
  if test "x$OPENJDK_TARGET_CPU_BITS" = x32 && test "x$OPENJDK_TARGET_OS" = xmacosx; then
    # On 32-bit MacOSX the OS requires C-entry points to be 16 byte aligned.
    # While waiting for a better solution, the current workaround is to use -mstackrealign.
    CFLAGS="$CFLAGS -mstackrealign"
    AC_MSG_CHECKING([if 32-bit compiler supports -mstackrealign])
    AC_LINK_IFELSE([AC_LANG_SOURCE([[int main() { return 0; }]])],
        [
          AC_MSG_RESULT([yes])
        ],
        [
          AC_MSG_RESULT([no])
          AC_MSG_ERROR([The selected compiler $CXX does not support -mstackrealign! Try to put another compiler in the path.])
        ]
    )
  fi

  C_FLAG_DEPS="-MMD -MF"
  CXX_FLAG_DEPS="-MMD -MF"

  case $COMPILER_TYPE in
    CC )
      case $COMPILER_NAME in
        gcc )
          case $OPENJDK_TARGET_OS in
            macosx )
              # On MacOSX we optimize for size, something
              # we should do for all platforms?
              C_O_FLAG_HI="-Os"
              C_O_FLAG_NORM="-Os"
              C_O_FLAG_NONE=""
              ;;
            *)
              C_O_FLAG_HI="-O3"
              C_O_FLAG_NORM="-O2"
              C_O_FLAG_NONE="-O0"
              ;;
          esac
          CXX_O_FLAG_HI="$C_O_FLAG_HI"
          CXX_O_FLAG_NORM="$C_O_FLAG_NORM"
          CXX_O_FLAG_NONE="$C_O_FLAG_NONE"
          CFLAGS_DEBUG_SYMBOLS="-g"
          CXXFLAGS_DEBUG_SYMBOLS="-g"
          if test "x$OPENJDK_TARGET_CPU_BITS" = "x64" && test "x$DEBUG_LEVEL" = "xfastdebug"; then
            CFLAGS_DEBUG_SYMBOLS="-g1"
            CXXFLAGS_DEBUG_SYMBOLS="-g1"
          fi
          ;;
        ossc )
          #
          # Forte has different names for this with their C++ compiler...
          #
          C_FLAG_DEPS="-xMMD -xMF"
          CXX_FLAG_DEPS="-xMMD -xMF"

          # Extra options used with HIGHEST
          #
          # WARNING: Use of OPTIMIZATION_LEVEL=HIGHEST in your Makefile needs to be
          #          done with care, there are some assumptions below that need to
          #          be understood about the use of pointers, and IEEE behavior.
          #
          # Use non-standard floating point mode (not IEEE 754)
          CC_HIGHEST="$CC_HIGHEST -fns"
          # Do some simplification of floating point arithmetic (not IEEE 754)
          CC_HIGHEST="$CC_HIGHEST -fsimple"
          # Use single precision floating point with 'float'
          CC_HIGHEST="$CC_HIGHEST -fsingle"
          # Assume memory references via basic pointer types do not alias
          #   (Source with excessing pointer casting and data access with mixed
          #    pointer types are not recommended)
          CC_HIGHEST="$CC_HIGHEST -xalias_level=basic"
          # Use intrinsic or inline versions for math/std functions
          #   (If you expect perfect errno behavior, do not use this)
          CC_HIGHEST="$CC_HIGHEST -xbuiltin=%all"
          # Loop data dependency optimizations (need -xO3 or higher)
          CC_HIGHEST="$CC_HIGHEST -xdepend"
          # Pointer parameters to functions do not overlap
          #   (Similar to -xalias_level=basic usage, but less obvious sometimes.
          #    If you pass in multiple pointers to the same data, do not use this)
          CC_HIGHEST="$CC_HIGHEST -xrestrict"
          # Inline some library routines
          #   (If you expect perfect errno behavior, do not use this)
          CC_HIGHEST="$CC_HIGHEST -xlibmil"
          # Use optimized math routines
          #   (If you expect perfect errno behavior, do not use this)
          #  Can cause undefined external on Solaris 8 X86 on __sincos, removing for now
          #CC_HIGHEST="$CC_HIGHEST -xlibmopt"

          if test "x$OPENJDK_TARGET_CPU" = xsparc; then
            CFLAGS_JDK="${CFLAGS_JDK} -xmemalign=4s"
            CXXFLAGS_JDK="${CXXFLAGS_JDK} -xmemalign=4s"
          fi

          case $OPENJDK_TARGET_CPU_ARCH in
            x86)
              C_O_FLAG_HIGHEST="-xO4 -Wu,-O4~yz $CC_HIGHEST -xregs=no%frameptr"
              C_O_FLAG_HI="-xO4 -Wu,-O4~yz -xregs=no%frameptr"
              C_O_FLAG_NORM="-xO2 -Wu,-O2~yz -xregs=no%frameptr"
              C_O_FLAG_NONE="-xregs=no%frameptr"
              CXX_O_FLAG_HIGHEST="-xO4 -Qoption ube -O4~yz $CC_HIGHEST -xregs=no%frameptr"
              CXX_O_FLAG_HI="-xO4 -Qoption ube -O4~yz -xregs=no%frameptr"
              CXX_O_FLAG_NORM="-xO2 -Qoption ube -O2~yz -xregs=no%frameptr"
              CXX_O_FLAG_NONE="-xregs=no%frameptr"
              if test "x$OPENJDK_TARGET_CPU" = xx86; then
                C_O_FLAG_HIGHEST="$C_O_FLAG_HIGHEST -xchip=pentium"
                CXX_O_FLAG_HIGHEST="$CXX_O_FLAG_HIGHEST -xchip=pentium"
              fi
              ;;
            sparc)
              CFLAGS_JDKLIB_EXTRA="${CFLAGS_JDKLIB_EXTRA} -xregs=no%appl"
              CXXFLAGS_JDKLIB_EXTRA="${CXXFLAGS_JDKLIB_EXTRA} -xregs=no%appl"
              C_O_FLAG_HIGHEST="-xO4 -Wc,-Qrm-s -Wc,-Qiselect-T0 $CC_HIGHEST -xprefetch=auto,explicit -xchip=ultra"
              C_O_FLAG_HI="-xO4 -Wc,-Qrm-s -Wc,-Qiselect-T0"
              C_O_FLAG_NORM="-xO2 -Wc,-Qrm-s -Wc,-Qiselect-T0"
              C_O_FLAG_NONE=""
              CXX_O_FLAG_HIGHEST="-xO4 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0 $CC_HIGHEST -xprefetch=auto,explicit -xchip=ultra"
              CXX_O_FLAG_HI="-xO4 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0"
              CXX_O_FLAG_NORM="-xO2 -Qoption cg -Qrm-s -Qoption cg -Qiselect-T0"
              CXX_O_FLAG_NONE=""
              ;;
          esac

          CFLAGS_DEBUG_SYMBOLS="-g -xs"
          CXXFLAGS_DEBUG_SYMBOLS="-g0 -xs"
          ;;
        xlc )
          C_FLAG_DEPS="-qmakedep=gcc -MF"
          CXX_FLAG_DEPS="-qmakedep=gcc -MF"
          C_O_FLAG_HIGHEST="-O3"
          C_O_FLAG_HI="-O3 -qstrict"
          C_O_FLAG_NORM="-O2"
          C_O_FLAG_NONE=""
          CXX_O_FLAG_HIGHEST="-O3"
          CXX_O_FLAG_HI="-O3 -qstrict"
          CXX_O_FLAG_NORM="-O2"
          CXX_O_FLAG_NONE=""
          CFLAGS_DEBUG_SYMBOLS="-g"
          CXXFLAGS_DEBUG_SYMBOLS="-g"
          LDFLAGS_JDK="${LDFLAGS_JDK} -q64 -brtl -bnolibpath -liconv -bexpall"
          CFLAGS_JDK="${CFLAGS_JDK} -qchars=signed -q64 -qfullpath -qsaveopt"
          CXXFLAGS_JDK="${CXXFLAGS_JDK} -qchars=signed -q64 -qfullpath -qsaveopt"
          ;;
      esac
      ;;
    CL )
      C_O_FLAG_HIGHEST="-O2"
      C_O_FLAG_HI="-O1"
      C_O_FLAG_NORM="-O1"
      C_O_FLAG_NONE="-Od"
      CXX_O_FLAG_HIGHEST="$C_O_FLAG_HIGHEST"
      CXX_O_FLAG_HI="$C_O_FLAG_HI"
      CXX_O_FLAG_NORM="$C_O_FLAG_NORM"
      CXX_O_FLAG_NONE="$C_O_FLAG_NONE"
      ;;
  esac

  if test -z "$C_O_FLAG_HIGHEST"; then
    C_O_FLAG_HIGHEST="$C_O_FLAG_HI"
  fi

  if test -z "$CXX_O_FLAG_HIGHEST"; then
    CXX_O_FLAG_HIGHEST="$CXX_O_FLAG_HI"
  fi

  AC_SUBST(C_O_FLAG_HIGHEST)
  AC_SUBST(C_O_FLAG_HI)
  AC_SUBST(C_O_FLAG_NORM)
  AC_SUBST(C_O_FLAG_NONE)
  AC_SUBST(CXX_O_FLAG_HIGHEST)
  AC_SUBST(CXX_O_FLAG_HI)
  AC_SUBST(CXX_O_FLAG_NORM)
  AC_SUBST(CXX_O_FLAG_NONE)
  AC_SUBST(C_FLAG_DEPS)
  AC_SUBST(CXX_FLAG_DEPS)
])

AC_DEFUN_ONCE([TOOLCHAIN_SETUP_COMPILER_FLAGS_FOR_JDK],
[

  if test "x$CFLAGS" != "x${ADDED_CFLAGS}"; then
    AC_MSG_WARN([Ignoring CFLAGS($CFLAGS) found in environment. Use --with-extra-cflags])
  fi

  if test "x$CXXFLAGS" != "x${ADDED_CXXFLAGS}"; then
    AC_MSG_WARN([Ignoring CXXFLAGS($CXXFLAGS) found in environment. Use --with-extra-cxxflags])
  fi

  if test "x$LDFLAGS" != "x${ADDED_LDFLAGS}"; then
    AC_MSG_WARN([Ignoring LDFLAGS($LDFLAGS) found in environment. Use --with-extra-ldflags])
  fi

  AC_ARG_WITH(extra-cflags, [AS_HELP_STRING([--with-extra-cflags],
      [extra flags to be used when compiling jdk c-files])])

  AC_ARG_WITH(extra-cxxflags, [AS_HELP_STRING([--with-extra-cxxflags],
      [extra flags to be used when compiling jdk c++-files])])

  AC_ARG_WITH(extra-ldflags, [AS_HELP_STRING([--with-extra-ldflags],
      [extra flags to be used when linking jdk])])

  CFLAGS_JDK="${CFLAGS_JDK} $with_extra_cflags"
  CXXFLAGS_JDK="${CXXFLAGS_JDK} $with_extra_cxxflags"
  LDFLAGS_JDK="${LDFLAGS_JDK} $with_extra_ldflags"

  # Hotspot needs these set in their legacy form
  LEGACY_EXTRA_CFLAGS=$with_extra_cflags
  LEGACY_EXTRA_CXXFLAGS=$with_extra_cxxflags
  LEGACY_EXTRA_LDFLAGS=$with_extra_ldflags

  AC_SUBST(LEGACY_EXTRA_CFLAGS)
  AC_SUBST(LEGACY_EXTRA_CXXFLAGS)
  AC_SUBST(LEGACY_EXTRA_LDFLAGS)

  ###############################################################################
  #
  # Now setup the CFLAGS and LDFLAGS for the JDK build.
  # Later we will also have CFLAGS and LDFLAGS for the hotspot subrepo build.
  #    CFLAGS_JDK    - C Compiler flags
  #    CXXFLAGS_JDK  - C++ Compiler flags
  #    COMMON_CCXXFLAGS_JDK - common to C and C++
  #
  case $COMPILER_NAME in
    gcc )
      COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS $COMMON_CCXXFLAGS_JDK -W -Wall -Wno-unused -Wno-parentheses \
      -pipe \
      -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE"
      CXXSTD_CXXFLAG="-std=gnu++98"
      TOOLCHAIN_CXX_COMPILER_CHECK_ARGUMENTS([$CXXSTD_CXXFLAG $CFLAGS_WARNINGS_ARE_ERRORS],
    					     [], [CXXSTD_CXXFLAG=""])
      CXXFLAGS_JDK="${CXXFLAGS_JDK} ${CXXSTD_CXXFLAG}"
      AC_SUBST([CXXSTD_CXXFLAG])
      case $OPENJDK_TARGET_CPU_ARCH in
        arm )
          # on arm we don't prevent gcc to omit frame pointer but do prevent strict aliasing
          CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
          ;;
        ppc )
          # on ppc we don't prevent gcc to omit frame pointer nor strict-aliasing
          ;;
        * )
          COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -fno-omit-frame-pointer"
          CFLAGS_JDK="${CFLAGS_JDK} -fno-strict-aliasing"
          ;;
      esac
      TOOLCHAIN_CHECK_COMPILER_VERSION(6, TOOLCHAIN_SETUP_GCC6_COMPILER_FLAGS)
      ;;
    ossc )
      COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS $COMMON_CCXXFLAGS_JDK -DTRACING -DMACRO_MEMSYS_OPS -DBREAKPTS"
      case $OPENJDK_TARGET_CPU_ARCH in
        x86 )
          COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DcpuIntel -Di586 -D$OPENJDK_TARGET_CPU_LEGACY_LIB"
          CFLAGS_JDK="$CFLAGS_JDK -erroff=E_BAD_PRAGMA_PACK_VALUE"
          ;;
      esac

      CFLAGS_JDK="$CFLAGS_JDK -xc99=%none -xCC -errshort=tags -Xa -v -mt -W0,-noglobal"
      CXXFLAGS_JDK="$CXXFLAGS_JDK -errtags=yes +w -mt -features=no%except -DCC_NOEX -norunpath -xnolib"

      LDFLAGS_JDK="$LDFLAGS_JDK -z defs -xildoff -ztext"
      LDFLAGS_CXX_JDK="$LDFLAGS_CXX_JDK -norunpath -xnolib"
      ;;
    xlc )
      CFLAGS_JDK="$CFLAGS_JDK -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE -DSTDC"
      CXXFLAGS_JDK="$CXXFLAGS_JDK -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE -DSTDC"

      LDFLAGS_JDK="$LDFLAGS_JDK"
      LDFLAGS_CXX_JDK="$LDFLAGS_CXX_JDK"
      ;;
    cl )
      COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS $COMMON_CCXXFLAGS_JDK -Zi -MD -Zc:wchar_t- -W3 -wd4800 \
      -D_STATIC_CPPLIB -D_DISABLE_DEPRECATE_STATIC_CPPLIB -DWIN32_LEAN_AND_MEAN \
      -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE \
      -DWIN32 -DIAL"
      case $OPENJDK_TARGET_CPU in
        x86 )
          COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -D_X86_ -Dx86"
          ;;
        x86_64 )
          COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -D_AMD64_ -Damd64"
          ;;
      esac
      ;;
  esac

  ###############################################################################

  # Adjust flags according to debug level.
  case $DEBUG_LEVEL in
    fastdebug )
      CFLAGS_JDK="$CFLAGS_JDK $CFLAGS_DEBUG_SYMBOLS"
      CXXFLAGS_JDK="$CXXFLAGS_JDK $CXXFLAGS_DEBUG_SYMBOLS"
      C_O_FLAG_HI="$C_O_FLAG_NORM"
      C_O_FLAG_NORM="$C_O_FLAG_NORM"
      CXX_O_FLAG_HI="$CXX_O_FLAG_NORM"
      CXX_O_FLAG_NORM="$CXX_O_FLAG_NORM"
      JAVAC_FLAGS="$JAVAC_FLAGS -g"
      ;;
    slowdebug )
      CFLAGS_JDK="$CFLAGS_JDK $CFLAGS_DEBUG_SYMBOLS"
      CXXFLAGS_JDK="$CXXFLAGS_JDK $CXXFLAGS_DEBUG_SYMBOLS"
      C_O_FLAG_HI="$C_O_FLAG_NONE"
      C_O_FLAG_NORM="$C_O_FLAG_NONE"
      CXX_O_FLAG_HI="$CXX_O_FLAG_NONE"
      CXX_O_FLAG_NORM="$CXX_O_FLAG_NONE"
      JAVAC_FLAGS="$JAVAC_FLAGS -g"
      ;;
  esac

  COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK $ADD_LP64"

  # The package path is used only on macosx?
  PACKAGE_PATH=/opt/local
  AC_SUBST(PACKAGE_PATH)

  if test "x$OPENJDK_TARGET_CPU_ENDIAN" = xlittle; then
    # The macro _LITTLE_ENDIAN needs to be defined the same to avoid the
    #   Sun C compiler warning message: warning: macro redefined: _LITTLE_ENDIAN
    #   (The Solaris X86 system defines this in file /usr/include/sys/isa_defs.h).
    #   Note: -Dmacro         is the same as    #define macro 1
    #         -Dmacro=        is the same as    #define macro
    if test "x$OPENJDK_TARGET_OS" = xsolaris; then
      COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -D_LITTLE_ENDIAN="
    else
      COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -D_LITTLE_ENDIAN"
    fi
  else
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -D_BIG_ENDIAN"
  fi
  if test "x$OPENJDK_TARGET_OS" = xlinux; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DLINUX"
  fi
  if test "x$OPENJDK_TARGET_OS" = xwindows; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DWINDOWS"
  fi
  if test "x$OPENJDK_TARGET_OS" = xsolaris; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DSOLARIS"
  fi
  if test "x$OPENJDK_TARGET_OS" = xaix; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DAIX -DPPC64"
  fi
  if test "x$OPENJDK_TARGET_OS" = xmacosx; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DMACOSX -D_ALLBSD_SOURCE -D_DARWIN_UNLIMITED_SELECT"
    # Setting these parameters makes it an error to link to macosx APIs that are
    # newer than the given OS version and makes the linked binaries compatible even
    # if built on a newer version of the OS.
    # The expected format is X.Y.Z
    MACOSX_VERSION_MIN=10.7.0
    AC_SUBST(MACOSX_VERSION_MIN)
    # The macro takes the version with no dots, ex: 1070
    # Let the flags variables get resolved in make for easier override on make
    # command line.
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DMAC_OS_X_VERSION_MAX_ALLOWED=\$(subst .,,\$(MACOSX_VERSION_MIN)) -mmacosx-version-min=\$(MACOSX_VERSION_MIN)"
    LDFLAGS_JDK="$LDFLAGS_JDK -mmacosx-version-min=\$(MACOSX_VERSION_MIN)"
  fi
  if test "x$OPENJDK_TARGET_OS" = xbsd; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DBSD -D_ALLBSD_SOURCE"
  fi
  if test "x$DEBUG_LEVEL" = xrelease; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DNDEBUG"
  if test "x$OPENJDK_TARGET_OS" = xsolaris; then
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DTRIMMED"
  fi
  else
    COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DDEBUG"
  fi

  COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DARCH='\"$OPENJDK_TARGET_CPU_LEGACY\"' -D$OPENJDK_TARGET_CPU_LEGACY"
  COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK -DRELEASE='\"\$(RELEASE)\"'"

  COMMON_CCXXFLAGS_JDK="$COMMON_CCXXFLAGS_JDK \
      -I${JDK_OUTPUTDIR}/include \
      -I${JDK_OUTPUTDIR}/include/$OPENJDK_TARGET_OS \
      -I${JDK_TOPDIR}/src/share/javavm/export \
      -I${JDK_TOPDIR}/src/$OPENJDK_TARGET_OS_EXPORT_DIR/javavm/export \
      -I${JDK_TOPDIR}/src/share/native/common \
      -I${JDK_TOPDIR}/src/$OPENJDK_TARGET_OS_API_DIR/native/common"

  # The shared libraries are compiled using the picflag.
  CFLAGS_JDKLIB="$COMMON_CCXXFLAGS_JDK $CFLAGS_JDK $PICFLAG $CFLAGS_JDKLIB_EXTRA"
  CXXFLAGS_JDKLIB="$COMMON_CCXXFLAGS_JDK $CXXFLAGS_JDK $PICFLAG $CXXFLAGS_JDKLIB_EXTRA "

  # Executable flags
  CFLAGS_JDKEXE="$COMMON_CCXXFLAGS_JDK $CFLAGS_JDK"
  CXXFLAGS_JDKEXE="$COMMON_CCXXFLAGS_JDK $CXXFLAGS_JDK"

  # Now this is odd. The JDK native libraries have to link against libjvm.so
  # On 32-bit machines there is normally two distinct libjvm.so:s, client and server.
  # Which should we link to? Are we lucky enough that the binary api to the libjvm.so library
  # is identical for client and server? Yes. Which is picked at runtime (client or server)?
  # Neither, since the chosen libjvm.so has already been loaded by the launcher, all the following
  # libraries will link to whatever is in memory. Yuck.
  #
  # Thus we offer the compiler to find libjvm.so first in server then in client. It works. Ugh.
  if test "x$COMPILER_NAME" = xcl; then
    LDFLAGS_JDK="$LDFLAGS_JDK -nologo -opt:ref -incremental:no"
    if test "x$OPENJDK_TARGET_CPU" = xx86; then
      LDFLAGS_JDK="$LDFLAGS_JDK -safeseh"
    fi
    # TODO: make -debug optional "--disable-full-debug-symbols"
    LDFLAGS_JDK="$LDFLAGS_JDK -debug"
    LDFLAGS_JDKLIB="${LDFLAGS_JDK} -dll -libpath:${JDK_OUTPUTDIR}/lib"
    LDFLAGS_JDKLIB_SUFFIX=""
    if test "x$OPENJDK_TARGET_CPU_BITS" = "x64"; then
      LDFLAGS_STACK_SIZE=1048576
    else
      LDFLAGS_STACK_SIZE=327680
    fi
    LDFLAGS_JDKEXE="${LDFLAGS_JDK} /STACK:$LDFLAGS_STACK_SIZE"
  else
    if test "x$COMPILER_NAME" = xgcc; then
      # If this is a --hash-style=gnu system, use --hash-style=both, why?
      HAS_GNU_HASH=`$CC -dumpspecs 2>/dev/null | $GREP 'hash-style=gnu'`
      if test -n "$HAS_GNU_HASH"; then
        LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker --hash-style=both "
      fi
      if test "x$OPENJDK_TARGET_OS" = xlinux; then
        # And since we now know that the linker is gnu, then add:
        #   -z defs, to forbid undefined symbols in object files
        #   -z noexecstack, to mark stack regions as non-executable
        LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker -z -Xlinker defs -Xlinker -z -Xlinker noexecstack"
        if test "x$DEBUG_LEVEL" = "xrelease"; then
          # When building release libraries, tell the linker optimize them.
          # Should this be supplied to the OSS linker as well?
          LDFLAGS_JDK="${LDFLAGS_JDK} -Xlinker -O1"
        fi
      fi
    fi
    LDFLAGS_JDKLIB="${LDFLAGS_JDK} $SHARED_LIBRARY_FLAGS \
        -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}"

    # On some platforms (mac) the linker warns about non existing -L dirs.
    # Add server first if available. Linking aginst client does not always produce the same results.
    # Only add client dir if client is being built. Add minimal (note not minimal1) if only building minimal1.
    # Default to server for other variants.
    if test "x$JVM_VARIANT_SERVER" = xtrue; then
      LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/server"
    elif test "x$JVM_VARIANT_CLIENT" = xtrue; then
      LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/client"
    elif test "x$JVM_VARIANT_MINIMAL1" = xtrue; then
      LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/minimal"
    else
      LDFLAGS_JDKLIB="${LDFLAGS_JDKLIB} -L${JDK_OUTPUTDIR}/lib${OPENJDK_TARGET_CPU_LIBDIR}/server"
    fi

    LDFLAGS_JDKLIB_SUFFIX="-ljava -ljvm"
    if test "x$COMPILER_NAME" = xossc; then
      LDFLAGS_JDKLIB_SUFFIX="$LDFLAGS_JDKLIB_SUFFIX -lc"
    fi

    LDFLAGS_JDKEXE="${LDFLAGS_JDK}"
    if test "x$OPENJDK_TARGET_OS" = xlinux; then
      LDFLAGS_JDKEXE="$LDFLAGS_JDKEXE -Xlinker --allow-shlib-undefined"
    fi
  fi

  AC_SUBST(CFLAGS_JDKLIB)
  AC_SUBST(CFLAGS_JDKEXE)

  AC_SUBST(CXXFLAGS_JDKLIB)
  AC_SUBST(CXXFLAGS_JDKEXE)

  AC_SUBST(LDFLAGS_JDKLIB)
  AC_SUBST(LDFLAGS_JDKEXE)
  AC_SUBST(LDFLAGS_JDKLIB_SUFFIX)
  AC_SUBST(LDFLAGS_JDKEXE_SUFFIX)
  AC_SUBST(LDFLAGS_CXX_JDK)
])


# TOOLCHAIN_C_COMPILER_CHECK_ARGUMENTS([ARGUMENT], [RUN-IF-TRUE],
#                                      [RUN-IF-FALSE])
# ------------------------------------------------------------
# Check that the C compiler supports an argument
AC_DEFUN([TOOLCHAIN_C_COMPILER_CHECK_ARGUMENTS],
[
  AC_MSG_CHECKING([if the C compiler supports "$1"])
  supports=yes

  saved_cflags="$CFLAGS"
  CFLAGS="$CFLAGS $1"
  AC_LANG_PUSH([C])
  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [], 
      [supports=no])
  AC_LANG_POP([C])
  CFLAGS="$saved_cflags"

  AC_MSG_RESULT([$supports])
  if test "x$supports" = "xyes" ; then
    m4_ifval([$2], [$2], [:])
  else
    m4_ifval([$3], [$3], [:])
  fi
])

# TOOLCHAIN_CXX_COMPILER_CHECK_ARGUMENTS([ARGUMENT], [RUN-IF-TRUE],
#                                        [RUN-IF-FALSE])
# ------------------------------------------------------------
# Check that the C++ compiler supports an argument
AC_DEFUN([TOOLCHAIN_CXX_COMPILER_CHECK_ARGUMENTS],
[
  AC_MSG_CHECKING([if the C++ compiler supports "$1"])
  supports=yes

  saved_cxxflags="$CXXFLAGS"
  CXXFLAGS="$CXXFLAG $1"
  AC_LANG_PUSH([C++])
  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [], 
      [supports=no])
  AC_LANG_POP([C++])
  CXXFLAGS="$saved_cxxflags"
  
  AC_MSG_RESULT([$supports])
  if test "x$supports" = "xyes" ; then
    m4_ifval([$2], [$2], [:])
  else
    m4_ifval([$3], [$3], [:])
  fi
])

# TOOLCHAIN_COMPILER_CHECK_ARGUMENTS([ARGUMENT], [RUN-IF-TRUE],
#                                    [RUN-IF-FALSE])
# ------------------------------------------------------------
# Check that the C and C++ compilers support an argument
AC_DEFUN([TOOLCHAIN_COMPILER_CHECK_ARGUMENTS],
[
  TOOLCHAIN_C_COMPILER_CHECK_ARGUMENTS([$1],
  				       [C_COMP_SUPPORTS="yes"],
				       [C_COMP_SUPPORTS="no"])
  TOOLCHAIN_CXX_COMPILER_CHECK_ARGUMENTS([$1],
  					 [CXX_COMP_SUPPORTS="yes"],
					 [CXX_COMP_SUPPORTS="no"])

  AC_MSG_CHECKING([if both compilers support "$1"])
  supports=no
  if test "x$C_COMP_SUPPORTS" = "xyes" -a "x$CXX_COMP_SUPPORTS" = "xyes"; then supports=yes; fi
  
  AC_MSG_RESULT([$supports])
  if test "x$supports" = "xyes" ; then
    m4_ifval([$2], [$2], [:])
  else
    m4_ifval([$3], [$3], [:])
  fi
])

AC_DEFUN_ONCE([TOOLCHAIN_SETUP_COMPILER_FLAGS_MISC],
[
  # Some Zero and Shark settings.
  # ZERO_ARCHFLAG tells the compiler which mode to build for
  case "${OPENJDK_TARGET_CPU}" in
    s390)
      ZERO_ARCHFLAG="${COMPILER_TARGET_BITS_FLAG}31"
      ;;
    *)
      ZERO_ARCHFLAG="${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}"
  esac
  TOOLCHAIN_COMPILER_CHECK_ARGUMENTS([$ZERO_ARCHFLAG], [], [ZERO_ARCHFLAG=""])
  AC_SUBST(ZERO_ARCHFLAG)

  # Check that the compiler supports -mX (or -qX on AIX) flags
  # Set COMPILER_SUPPORTS_TARGET_BITS_FLAG to 'true' if it does
  TOOLCHAIN_COMPILER_CHECK_ARGUMENTS([${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}],
      [COMPILER_SUPPORTS_TARGET_BITS_FLAG=true],
      [COMPILER_SUPPORTS_TARGET_BITS_FLAG=false])
  AC_SUBST(COMPILER_SUPPORTS_TARGET_BITS_FLAG)


  # Check for broken SuSE 'ld' for which 'Only anonymous version tag is allowed in executable.'
  USING_BROKEN_SUSE_LD=no
  if test "x$OPENJDK_TARGET_OS" = xlinux && test "x$GCC" = xyes; then
    AC_MSG_CHECKING([for broken SuSE 'ld' which only understands anonymous version tags in executables])
    echo "SUNWprivate_1.1 { local: *; };" > version-script.map
    echo "int main() { }" > main.c
    if $CXX -Xlinker -version-script=version-script.map main.c 2>&AS_MESSAGE_LOG_FD >&AS_MESSAGE_LOG_FD; then
      AC_MSG_RESULT(no)
      USING_BROKEN_SUSE_LD=no
    else
      AC_MSG_RESULT(yes)
      USING_BROKEN_SUSE_LD=yes
    fi
    rm -rf version-script.map main.c
  fi
  AC_SUBST(USING_BROKEN_SUSE_LD)
])

# Setup the JTREG paths
AC_DEFUN_ONCE([TOOLCHAIN_SETUP_JTREG],
[
  AC_ARG_WITH(jtreg, [AS_HELP_STRING([--with-jtreg],
      [Regression Test Harness @<:@probed@:>@])],
      [],
      [with_jtreg=no])

  if test "x$with_jtreg" = xno; then
    # jtreg disabled
    AC_MSG_CHECKING([for jtreg])
    AC_MSG_RESULT(no)
  else
    if test "x$with_jtreg" != xyes; then
      # with path specified.
      JT_HOME="$with_jtreg"
    fi

    if test "x$JT_HOME" != x; then
      AC_MSG_CHECKING([for jtreg])

      # use JT_HOME enviroment var.
      BASIC_FIXUP_PATH([JT_HOME])

      # jtreg win32 script works for everybody
      JTREGEXE="$JT_HOME/bin/jtreg"

      if test ! -f "$JTREGEXE"; then
        AC_MSG_ERROR([JTReg executable does not exist: $JTREGEXE])
      fi

      AC_MSG_RESULT($JTREGEXE)
    else
      # try to find jtreg on path
      BASIC_REQUIRE_PROG(JTREGEXE, jtreg)
      JT_HOME="`$DIRNAME $JTREGEXE`"
    fi
  fi

  AC_SUBST(JT_HOME)
  AC_SUBST(JTREGEXE)
])

AC_DEFUN_ONCE([TOOLCHAIN_SETUP_GCC6_COMPILER_FLAGS],
[
  # These flags are required for GCC 6 builds as undefined behaviour in OpenJDK code
  # runs afoul of the more aggressive versions of these optimisations.
  # Notably, value range propagation now assumes that the this pointer of C++
  # member functions is non-null.
  NO_DELETE_NULL_POINTER_CHECKS_CFLAG="-fno-delete-null-pointer-checks"
  TOOLCHAIN_COMPILER_CHECK_ARGUMENTS([$NO_DELETE_NULL_POINTER_CHECKS_CFLAG -Werror],
  				     [], [NO_DELETE_NULL_POINTER_CHECKS_CFLAG=""])
  AC_SUBST([NO_DELETE_NULL_POINTER_CHECKS_CFLAG])
  NO_LIFETIME_DSE_CFLAG="-fno-lifetime-dse"
  TOOLCHAIN_COMPILER_CHECK_ARGUMENTS([$NO_LIFETIME_DSE_CFLAG -Werror],
  				     [], [NO_LIFETIME_DSE_CFLAG=""])
  CFLAGS_JDK="${CFLAGS_JDK} ${NO_DELETE_NULL_POINTER_CHECKS_CFLAG} ${NO_LIFETIME_DSE_CFLAG}"
  AC_SUBST([NO_LIFETIME_DSE_CFLAG])
])