#

# 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.

#

m4_include([flags-cflags.m4])

m4_include([flags-ldflags.m4])

m4_include([flags-other.m4])

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

#

# Setup ABI profile (for arm)

#

AC_DEFUN([FLAGS_SETUP_ABI_PROFILE],

[

  AC_ARG_WITH(abi-profile, [AS_HELP_STRING([--with-abi-profile],

      [specify ABI profile for ARM builds (arm-vfp-sflt,arm-vfp-hflt,arm-sflt, armv5-vfp-sflt,armv6-vfp-hflt,aarch64) @<:@toolchain dependent@:>@ ])])

  if test "x$with_abi_profile" != x; then

    if test "x$OPENJDK_TARGET_CPU" != xarm && \

        test "x$OPENJDK_TARGET_CPU" != xaarch64; then

      AC_MSG_ERROR([--with-abi-profile only available on arm/aarch64])

    fi

    OPENJDK_TARGET_ABI_PROFILE=$with_abi_profile

    AC_MSG_CHECKING([for ABI profle])

    AC_MSG_RESULT([$OPENJDK_TARGET_ABI_PROFILE])

    # --- Arm-sflt CFLAGS and ASFLAGS ---

    # Armv5te is required for assembler, because pld insn used in arm32 hotspot is only in v5E and above.

    # However, there is also a GCC bug which generates unaligned strd/ldrd instructions on armv5te:

    # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82445, and it was fixed only quite recently.

    # The resulting compromise is to enable v5TE for assembler and let GCC generate code for v5T.

    if test "x$OPENJDK_TARGET_ABI_PROFILE" = xarm-vfp-sflt; then

      ARM_FLOAT_TYPE=vfp-sflt

      ARM_ARCH_TYPE_FLAGS='-march=armv7-a -mthumb'

      ARM_ARCH_TYPE_ASFLAGS='-march=armv7-a -mthumb'

    elif test "x$OPENJDK_TARGET_ABI_PROFILE" = xarm-vfp-hflt; then

      ARM_FLOAT_TYPE=vfp-hflt

      ARM_ARCH_TYPE_FLAGS='-march=armv7-a -mthumb'

      ARM_ARCH_TYPE_ASFLAGS='-march=armv7-a -mthumb'

    elif test "x$OPENJDK_TARGET_ABI_PROFILE" = xarm-sflt; then

      ARM_FLOAT_TYPE=sflt

      ARM_ARCH_TYPE_FLAGS='-march=armv5t -marm'

      ARM_ARCH_TYPE_ASFLAGS='-march=armv5te'

    elif test "x$OPENJDK_TARGET_ABI_PROFILE" = xarmv5-vfp-sflt; then

      ARM_FLOAT_TYPE=vfp-sflt

      ARM_ARCH_TYPE_FLAGS='-march=armv5t -marm'

      ARM_ARCH_TYPE_ASFLAGS='-march=armv5te'

    elif test "x$OPENJDK_TARGET_ABI_PROFILE" = xarmv6-vfp-hflt; then

      ARM_FLOAT_TYPE=vfp-hflt

      ARM_ARCH_TYPE_FLAGS='-march=armv6 -marm'

      ARM_ARCH_TYPE_ASFLAGS='-march=armv6'

    elif test "x$OPENJDK_TARGET_ABI_PROFILE" = xaarch64; then

      # No special flags, just need to trigger setting JDK_ARCH_ABI_PROP_NAME

      ARM_FLOAT_TYPE=

      ARM_ARCH_TYPE_FLAGS=

      ARM_ARCH_TYPE_ASFLAGS=

    else

      AC_MSG_ERROR([Invalid ABI profile: "$OPENJDK_TARGET_ABI_PROFILE"])

    fi

    if test "x$ARM_FLOAT_TYPE" = xvfp-sflt; then

      ARM_FLOAT_TYPE_FLAGS='-mfloat-abi=softfp -mfpu=vfp -DFLOAT_ARCH=-vfp-sflt'

      ARM_FLOAT_TYPE_ASFLAGS="-mfloat-abi=softfp -mfpu=vfp"

    elif test "x$ARM_FLOAT_TYPE" = xvfp-hflt; then

      ARM_FLOAT_TYPE_FLAGS='-mfloat-abi=hard -mfpu=vfp -DFLOAT_ARCH=-vfp-hflt'

      ARM_FLOAT_TYPE_ASFLAGS="-mfloat-abi=hard -mfpu=vfp"

    elif test "x$ARM_FLOAT_TYPE" = xsflt; then

      ARM_FLOAT_TYPE_FLAGS='-msoft-float -mfpu=vfp'

      ARM_FLOAT_TYPE_ASFLAGS="-mfloat-abi=soft -mfpu=vfp"

    fi

    AC_MSG_CHECKING([for $ARM_FLOAT_TYPE floating point flags])

    AC_MSG_RESULT([$ARM_FLOAT_TYPE_FLAGS])

    AC_MSG_CHECKING([for $ARM_FLOAT_TYPE floating point flags for assembler])

    AC_MSG_RESULT([$ARM_FLOAT_TYPE_ASFLAGS])

    AC_MSG_CHECKING([for arch type flags])

    AC_MSG_RESULT([$ARM_ARCH_TYPE_FLAGS])

    AC_MSG_CHECKING([for arch type flags for assembler])

    AC_MSG_RESULT([$ARM_ARCH_TYPE_ASFLAGS])

    # Now set JDK_ARCH_ABI_PROP_NAME. This is equivalent to the last part of the

    # autoconf target triplet.

    [ JDK_ARCH_ABI_PROP_NAME=`$ECHO $OPENJDK_TARGET_AUTOCONF_NAME | $SED -e 's/.*-\([^-]*\)$/\1/'` ]

    # Sanity check that it is a known ABI.

    if test "x$JDK_ARCH_ABI_PROP_NAME" != xgnu && \

        test "x$JDK_ARCH_ABI_PROP_NAME" != xgnueabi  && \

        test "x$JDK_ARCH_ABI_PROP_NAME" != xgnueabihf; then

          AC_MSG_WARN([Unknown autoconf target triplet ABI: "$JDK_ARCH_ABI_PROP_NAME"])

    fi

    AC_MSG_CHECKING([for ABI property name])

    AC_MSG_RESULT([$JDK_ARCH_ABI_PROP_NAME])

    AC_SUBST(JDK_ARCH_ABI_PROP_NAME)

  fi

  # When building with an abi profile, the name of that profile is appended on the

  # bundle platform, which is used in bundle names.

  if test "x$OPENJDK_TARGET_ABI_PROFILE" != x; then

    OPENJDK_TARGET_BUNDLE_PLATFORM="$OPENJDK_TARGET_OS_BUNDLE-$OPENJDK_TARGET_ABI_PROFILE"

  fi

])

AC_DEFUN([FLAGS_SETUP_MACOSX_VERSION],

[

  # Additional macosx handling

  if test "x$OPENJDK_TARGET_OS" = xmacosx; then

    # MACOSX_VERSION_MIN specifies the lowest version of Macosx that the built

    # binaries should be compatible with, even if compiled on a newer version

    # of the OS. It currently has a hard coded value. Setting this also limits

    # exposure to API changes in header files. Bumping this is likely to

    # require code changes to build.

    MACOSX_VERSION_MIN=10.9.0

    MACOSX_VERSION_MIN_NODOTS=${MACOSX_VERSION_MIN//\./}

    AC_SUBST(MACOSX_VERSION_MIN)

    # Setting --with-macosx-version-max=<version> makes it an error to build or

    # link to macosx APIs that are newer than the given OS version. The expected

    # format for <version> is either nn.n.n or nn.nn.nn. See /usr/include/AvailabilityMacros.h.

    AC_ARG_WITH([macosx-version-max], [AS_HELP_STRING([--with-macosx-version-max],

        [error on use of newer functionality. @<:@macosx@:>@])],

        [

          if echo "$with_macosx_version_max" | $GREP -q "^[[0-9]][[0-9]]\.[[0-9]]\.[[0-9]]\$"; then

              MACOSX_VERSION_MAX=$with_macosx_version_max

          elif echo "$with_macosx_version_max" | $GREP -q "^[[0-9]][[0-9]]\.[[0-9]][[0-9]]\.[[0-9]][[0-9]]\$"; then

              MACOSX_VERSION_MAX=$with_macosx_version_max

          elif test "x$with_macosx_version_max" = "xno"; then

              # Use build system default

              MACOSX_VERSION_MAX=

          else

              AC_MSG_ERROR([osx version format must be nn.n.n or nn.nn.nn])

          fi

        ],

        [MACOSX_VERSION_MAX=]

    )

    MACOSX_VERSION_MAX_NODOTS=${MACOSX_VERSION_MAX//\./}

    AC_SUBST(MACOSX_VERSION_MAX)

  fi

])

# Reset the global CFLAGS/LDFLAGS variables and initialize them with the

# corresponding configure arguments instead

AC_DEFUN_ONCE([FLAGS_SETUP_USER_SUPPLIED_FLAGS],

[

  if test "x$CFLAGS" != "x"; then

    AC_MSG_WARN([Ignoring CFLAGS($CFLAGS) found in environment. Use --with-extra-cflags])

  fi

  if test "x$CXXFLAGS" != "x"; then

    AC_MSG_WARN([Ignoring CXXFLAGS($CXXFLAGS) found in environment. Use --with-extra-cxxflags])

  fi

  if test "x$LDFLAGS" != "x"; then

    AC_MSG_WARN([Ignoring LDFLAGS($LDFLAGS) found in environment. Use --with-extra-ldflags])

  fi

  if test "x$ASFLAGS" != "x"; then

    AC_MSG_WARN([Ignoring ASFLAGS($ASFLAGS) found in environment. Use --with-extra-asflags])

  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])])

  AC_ARG_WITH(extra-asflags, [AS_HELP_STRING([--with-extra-asflags],

      [extra flags to be passed to the assembler])])

  USER_CFLAGS="$with_extra_cflags"

  USER_CXXFLAGS="$with_extra_cxxflags"

  USER_LDFLAGS="$with_extra_ldflags"

  USER_ASFLAGS="$with_extra_asflags"

])

# Setup the sysroot flags and add them to global CFLAGS and LDFLAGS so

# that configure can use them while detecting compilers.

# TOOLCHAIN_TYPE is available here.

# Param 1 - Optional prefix to all variables. (e.g BUILD_)

AC_DEFUN([FLAGS_SETUP_SYSROOT_FLAGS],

[

  if test "x[$]$1SYSROOT" != "x"; then

    if test "x$TOOLCHAIN_TYPE" = xsolstudio; then

      if test "x$OPENJDK_TARGET_OS" = xsolaris; then

        # Solaris Studio does not have a concept of sysroot. Instead we must

        # make sure the default include and lib dirs are appended to each

        # compile and link command line. Must also add -I-xbuiltin to enable

        # inlining of system functions and intrinsics.

        $1SYSROOT_CFLAGS="-I-xbuiltin -I[$]$1SYSROOT/usr/include"

        $1SYSROOT_LDFLAGS="-L[$]$1SYSROOT/usr/lib$OPENJDK_TARGET_CPU_ISADIR \

            -L[$]$1SYSROOT/lib$OPENJDK_TARGET_CPU_ISADIR"

        # If the devkit contains the ld linker, make sure we use it.

        AC_PATH_PROG(SOLARIS_LD, ld, , $DEVKIT_TOOLCHAIN_PATH:$DEVKIT_EXTRA_PATH)

        # Make sure this ld is runnable.

        if test -f "$SOLARIS_LD"; then

          if "$SOLARIS_LD" -V > /dev/null 2> /dev/null; then

            $1SYSROOT_LDFLAGS="[$]$1SYSROOT_LDFLAGS -Yl,$(dirname $SOLARIS_LD)"

          else

            AC_MSG_WARN([Could not run $SOLARIS_LD found in devkit, reverting to system ld])

          fi

        fi

      fi

    elif test "x$TOOLCHAIN_TYPE" = xgcc; then

      $1SYSROOT_CFLAGS="--sysroot=[$]$1SYSROOT"

      $1SYSROOT_LDFLAGS="--sysroot=[$]$1SYSROOT"

    elif test "x$TOOLCHAIN_TYPE" = xclang; then

      $1SYSROOT_CFLAGS="-isysroot [$]$1SYSROOT"

      $1SYSROOT_LDFLAGS="-isysroot [$]$1SYSROOT"

    fi

  fi

  if test "x$OPENJDK_TARGET_OS" = xmacosx; then

    # We also need -iframework<path>/System/Library/Frameworks

    $1SYSROOT_CFLAGS="[$]$1SYSROOT_CFLAGS -iframework [$]$1SYSROOT/System/Library/Frameworks"

    $1SYSROOT_LDFLAGS="[$]$1SYSROOT_LDFLAGS -iframework [$]$1SYSROOT/System/Library/Frameworks"

    # These always need to be set, or we can't find the frameworks embedded in JavaVM.framework

    # set this here so it doesn't have to be peppered throughout the forest

    $1SYSROOT_CFLAGS="[$]$1SYSROOT_CFLAGS -F [$]$1SYSROOT/System/Library/Frameworks/JavaVM.framework/Frameworks"

    $1SYSROOT_LDFLAGS="[$]$1SYSROOT_LDFLAGS -F [$]$1SYSROOT/System/Library/Frameworks/JavaVM.framework/Frameworks"

  fi

  AC_SUBST($1SYSROOT_CFLAGS)

  AC_SUBST($1SYSROOT_LDFLAGS)

])

AC_DEFUN_ONCE([FLAGS_PRE_TOOLCHAIN],

[

  # We should always include user supplied flags

  FLAGS_SETUP_USER_SUPPLIED_FLAGS

  # The sysroot flags are needed for configure to be able to run the compilers

  FLAGS_SETUP_SYSROOT_FLAGS

  # For solstudio and xlc, the word size flag is required for correct behavior.

  # For clang/gcc, the flag is only strictly required for reduced builds, but

  # set it always where possible (x86, sparc and ppc).

  if test "x$TOOLCHAIN_TYPE" = xxlc; then

    MACHINE_FLAG="-q${OPENJDK_TARGET_CPU_BITS}"

  elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then

    MACHINE_FLAG="-m${OPENJDK_TARGET_CPU_BITS}"

  elif test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang; then

    if test "x$OPENJDK_TARGET_CPU_ARCH" = xx86 &&

        test "x$OPENJDK_TARGET_CPU" != xx32 ||

        test "x$OPENJDK_TARGET_CPU_ARCH" = xsparc ||

        test "x$OPENJDK_TARGET_CPU_ARCH" = xppc; then

      MACHINE_FLAG="-m${OPENJDK_TARGET_CPU_BITS}"

    fi

  fi

  # FIXME: global flags are not used yet...

  # The "global" flags will *always* be set. Without them, it is not possible to

  # get a working compilation.

  GLOBAL_CFLAGS="$MACHINE_FLAG $SYSROOT_CFLAGS $USER_CFLAGS"

  GLOBAL_CXXFLAGS="$MACHINE_FLAG $SYSROOT_CFLAGS $USER_CXXFLAGS"

  GLOBAL_LDFLAGS="$MACHINE_FLAG $SYSROOT_LDFLAGS $USER_LDFLAGS"

  # FIXME: Don't really know how to do with this, but this was the old behavior

  GLOBAL_CPPFLAGS="$SYSROOT_CFLAGS"

  AC_SUBST(GLOBAL_CFLAGS)

  AC_SUBST(GLOBAL_CXXFLAGS)

  AC_SUBST(GLOBAL_LDFLAGS)

  AC_SUBST(GLOBAL_CPPFLAGS)

  # FIXME: For compatilibity, export this as EXTRA_CFLAGS for now.

  EXTRA_CFLAGS="$MACHINE_FLAG $USER_CFLAGS"

  EXTRA_CXXFLAGS="$MACHINE_FLAG $USER_CXXFLAGS"

  EXTRA_LDFLAGS="$MACHINE_FLAG $USER_LDFLAGS"

  EXTRA_ASFLAGS="$USER_ASFLAGS"

  AC_SUBST(EXTRA_CFLAGS)

  AC_SUBST(EXTRA_CXXFLAGS)

  AC_SUBST(EXTRA_LDFLAGS)

  AC_SUBST(EXTRA_ASFLAGS)

  # For autoconf testing to work, the global flags must also be stored in the

  # "unnamed" CFLAGS etc.

  CFLAGS="$GLOBAL_CFLAGS"

  CXXFLAGS="$GLOBAL_CXXFLAGS"

  LDFLAGS="$GLOBAL_LDFLAGS"

  CPPFLAGS="$GLOBAL_CPPFLAGS"

])

AC_DEFUN([FLAGS_SETUP_TOOLCHAIN_CONTROL],

[

  # COMPILER_TARGET_BITS_FLAG  : option for selecting 32- or 64-bit output

  # COMPILER_COMMAND_FILE_FLAG : option for passing a command file to the compiler

  # COMPILER_BINDCMD_FILE_FLAG : option for specifying a file which saves the binder

  #                              commands produced by the link step (currently AIX only)

  if test "x$TOOLCHAIN_TYPE" = xxlc; then

    COMPILER_TARGET_BITS_FLAG="-q"

    COMPILER_COMMAND_FILE_FLAG="-f"

    COMPILER_BINDCMD_FILE_FLAG="-bloadmap:"

  else

    COMPILER_TARGET_BITS_FLAG="-m"

    COMPILER_COMMAND_FILE_FLAG="@"

    COMPILER_BINDCMD_FILE_FLAG=""

    # The solstudio linker does not support @-files.

    if test "x$TOOLCHAIN_TYPE" = xsolstudio; then

      COMPILER_COMMAND_FILE_FLAG=

    fi

    # Check if @file is supported by gcc

    if test "x$TOOLCHAIN_TYPE" = xgcc; then

      AC_MSG_CHECKING([if @file is supported by gcc])

      # Extra emtpy "" to prevent ECHO from interpreting '--version' as argument

      $ECHO "" "--version" > command.file

      if $CXX @command.file 2>&AS_MESSAGE_LOG_FD >&AS_MESSAGE_LOG_FD; then

        AC_MSG_RESULT(yes)

        COMPILER_COMMAND_FILE_FLAG="@"

      else

        AC_MSG_RESULT(no)

        COMPILER_COMMAND_FILE_FLAG=

      fi

      $RM command.file

    fi

  fi

  AC_SUBST(COMPILER_TARGET_BITS_FLAG)

  AC_SUBST(COMPILER_COMMAND_FILE_FLAG)

  AC_SUBST(COMPILER_BINDCMD_FILE_FLAG)

  # Check that the compiler supports -mX (or -qX on AIX) flags

  # Set COMPILER_SUPPORTS_TARGET_BITS_FLAG to 'true' if it does

  FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}],

      IF_TRUE: [COMPILER_SUPPORTS_TARGET_BITS_FLAG=true],

      IF_FALSE: [COMPILER_SUPPORTS_TARGET_BITS_FLAG=false])

  AC_SUBST(COMPILER_SUPPORTS_TARGET_BITS_FLAG)

  if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then

    CC_OUT_OPTION=-Fo

    LD_OUT_OPTION=-out:

    AR_OUT_OPTION=-out:

  else

    # 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 output

    LD_OUT_OPTION='-o$(SPACE)'

    # When archiving, how to specify the destination static archive.

    if test "x$OPENJDK_TARGET_OS" = xmacosx; then

      AR_OUT_OPTION='-r -cs$(SPACE)'

    else

      AR_OUT_OPTION='-rcs$(SPACE)'

    fi

  fi

  AC_SUBST(CC_OUT_OPTION)

  AC_SUBST(LD_OUT_OPTION)

  AC_SUBST(AR_OUT_OPTION)

  # Generate make dependency files

  if test "x$TOOLCHAIN_TYPE" = xgcc; then

    C_FLAG_DEPS="-MMD -MF"

  elif test "x$TOOLCHAIN_TYPE" = xclang; then

    C_FLAG_DEPS="-MMD -MF"

  elif test "x$TOOLCHAIN_TYPE" = xsolstudio; then

    C_FLAG_DEPS="-xMMD -xMF"

  elif test "x$TOOLCHAIN_TYPE" = xxlc; then

    C_FLAG_DEPS="-qmakedep=gcc -MF"

  fi

  CXX_FLAG_DEPS="$C_FLAG_DEPS"

  AC_SUBST(C_FLAG_DEPS)

  AC_SUBST(CXX_FLAG_DEPS)

])

AC_DEFUN_ONCE([FLAGS_POST_TOOLCHAIN],

[

  FLAGS_SETUP_TOOLCHAIN_CONTROL

  if test "x$BUILD_SYSROOT" != x; then

    FLAGS_SETUP_SYSROOT_FLAGS([BUILD_])

  else

    if test "x$COMPILE_TYPE" != "xcross"; then

      BUILD_SYSROOT_CFLAGS="$SYSROOT_CFLAGS"

      BUILD_SYSROOT_LDFLAGS="$SYSROOT_LDFLAGS"

    fi

  fi

  AC_SUBST(BUILD_SYSROOT_CFLAGS)

  AC_SUBST(BUILD_SYSROOT_LDFLAGS)

])

AC_DEFUN([FLAGS_SETUP_FLAGS],

[

  FLAGS_SETUP_MACOSX_VERSION

  FLAGS_SETUP_ABI_PROFILE

  FLAGS_SETUP_SHARED_LIBS

  FLAGS_SETUP_DEBUG_SYMBOLS

  FLAGS_SETUP_WARNINGS

  FLAGS_SETUP_QUALITY_CHECKS

  FLAGS_SETUP_OPTIMIZATION

  FLAGS_SETUP_CFLAGS

  FLAGS_SETUP_LDFLAGS

  FLAGS_SETUP_ARFLAGS

  FLAGS_SETUP_STRIPFLAGS

  FLAGS_SETUP_RCFLAGS

  FLAGS_SETUP_ASFLAGS

  FLAGS_SETUP_ASFLAGS_CPU_DEP([TARGET])

  FLAGS_SETUP_ASFLAGS_CPU_DEP([BUILD], [OPENJDK_BUILD_])

])

# FLAGS_C_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [ARGUMENT], IF_TRUE: [RUN-IF-TRUE],

#                                  IF_FALSE: [RUN-IF-FALSE])

# ------------------------------------------------------------

# Check that the C compiler supports an argument

BASIC_DEFUN_NAMED([FLAGS_C_COMPILER_CHECK_ARGUMENTS],

    [*ARGUMENT IF_TRUE IF_FALSE PREFIX], [$@],

[

  AC_MSG_CHECKING([if ARG_PREFIX[CC] supports "ARG_ARGUMENT"])

  supports=yes

  saved_cflags="$CFLAGS"

  saved_cc="$CC"

  CFLAGS="$CFLAGS ARG_ARGUMENT"

  CC="$ARG_PREFIX[CC]"

  AC_LANG_PUSH([C])

  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [],

      [supports=no])

  AC_LANG_POP([C])

  CC="$saved_cc"

  CFLAGS="$saved_cflags"

  AC_MSG_RESULT([$supports])

  if test "x$supports" = "xyes" ; then

    :

    ARG_IF_TRUE

  else

    :

    ARG_IF_FALSE

  fi

])

# FLAGS_CXX_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [ARGUMENT], IF_TRUE: [RUN-IF-TRUE],

#                                    IF_FALSE: [RUN-IF-FALSE])

# ------------------------------------------------------------

# Check that the C++ compiler supports an argument

BASIC_DEFUN_NAMED([FLAGS_CXX_COMPILER_CHECK_ARGUMENTS],

    [*ARGUMENT IF_TRUE IF_FALSE PREFIX], [$@],

[

  AC_MSG_CHECKING([if ARG_PREFIX[CXX] supports "ARG_ARGUMENT"])

  supports=yes

  saved_cxxflags="$CXXFLAGS"

  saved_cxx="$CXX"

  CXXFLAGS="$CXXFLAG ARG_ARGUMENT"

  CXX="$ARG_PREFIX[CXX]"

  AC_LANG_PUSH([C++])

  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int i;]])], [],

      [supports=no])

  AC_LANG_POP([C++])

  CXX="$saved_cxx"

  CXXFLAGS="$saved_cxxflags"

  AC_MSG_RESULT([$supports])

  if test "x$supports" = "xyes" ; then

    :

    ARG_IF_TRUE

  else

    :

    ARG_IF_FALSE