#

# Copyright (c) 2011, 2012, 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.

#

# Support macro for PLATFORM_EXTRACT_TARGET_AND_BUILD.

# Converts autoconf style CPU name to OpenJDK style, into

# VAR_CPU, VAR_CPU_ARCH, VAR_CPU_BITS and VAR_CPU_ENDIAN.

AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_CPU],

[

  # First argument is the cpu name from the trip/quad

  case "$1" in

    x86_64)

      VAR_CPU=x86_64

      VAR_CPU_ARCH=x86

      VAR_CPU_BITS=64

      VAR_CPU_ENDIAN=little

      ;;

    i?86)

      VAR_CPU=x86

      VAR_CPU_ARCH=x86

      VAR_CPU_BITS=32

      VAR_CPU_ENDIAN=little

      ;;

    arm*)

      VAR_CPU=arm

      VAR_CPU_ARCH=arm

      VAR_CPU_BITS=32

      VAR_CPU_ENDIAN=little

      ;;

    powerpc)

      VAR_CPU=ppc

      VAR_CPU_ARCH=ppc

      VAR_CPU_BITS=32

      VAR_CPU_ENDIAN=big

      ;;

    powerpc64)

      VAR_CPU=ppc64

      VAR_CPU_ARCH=ppc

      VAR_CPU_BITS=64

      VAR_CPU_ENDIAN=big

      ;;

    powerpc64le)

      VAR_CPU=ppc64

      VAR_CPU_ARCH=ppc

      VAR_CPU_BITS=64

      VAR_CPU_ENDIAN=little

      ;;

    s390)

      VAR_CPU=s390

      VAR_CPU_ARCH=s390

      VAR_CPU_BITS=32

      VAR_CPU_ENDIAN=big

      ;;

    s390x)

      VAR_CPU=s390x

      VAR_CPU_ARCH=s390

      VAR_CPU_BITS=64

      VAR_CPU_ENDIAN=big

      ;;

    sparc)

      VAR_CPU=sparc

      VAR_CPU_ARCH=sparc

      VAR_CPU_BITS=32

      VAR_CPU_ENDIAN=big

      ;;

    sparcv9|sparc64)

      VAR_CPU=sparcv9

      VAR_CPU_ARCH=sparc

      VAR_CPU_BITS=64

      VAR_CPU_ENDIAN=big

      ;;

    *)

      AC_MSG_ERROR([unsupported cpu $1])

      ;;

  esac

])

# Support macro for PLATFORM_EXTRACT_TARGET_AND_BUILD.

# Converts autoconf style OS name to OpenJDK style, into

# VAR_OS, VAR_OS_TYPE and VAR_OS_ENV.

AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_OS],

[

  case "$1" in

    *linux*)

      VAR_OS=linux

      VAR_OS_TYPE=unix

      ;;

    *solaris*)

      VAR_OS=solaris

      VAR_OS_TYPE=unix

      ;;

    *darwin*)

      VAR_OS=macosx

      VAR_OS_TYPE=unix

      ;;

    *bsd*)

      VAR_OS=bsd

      VAR_OS_TYPE=unix

      ;;

    *cygwin*)

      VAR_OS=windows

      VAR_OS_ENV=windows.cygwin

      ;;

    *mingw*)

      VAR_OS=windows

      VAR_OS_ENV=windows.msys

      ;;

    *aix*)

      VAR_OS=aix

      VAR_OS_TYPE=unix

      ;;

    *)

      AC_MSG_ERROR([unsupported operating system $1])

      ;;

  esac

])

# Expects $host_os $host_cpu $build_os and $build_cpu

# and $with_target_bits to have been setup!

#

# Translate the standard triplet(quadruplet) definition

# of the target/build system into OPENJDK_TARGET_OS, OPENJDK_TARGET_CPU,

# OPENJDK_BUILD_OS, etc.

AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],

[

  # Copy the autoconf trip/quadruplet verbatim to OPENJDK_TARGET_AUTOCONF_NAME

  # (from the autoconf "host") and OPENJDK_BUILD_AUTOCONF_NAME

  # Note that we might later on rewrite e.g. OPENJDK_TARGET_CPU due to reduced build,

  # but this will not change the value of OPENJDK_TARGET_AUTOCONF_NAME.

  OPENJDK_TARGET_AUTOCONF_NAME="$host"

  OPENJDK_BUILD_AUTOCONF_NAME="$build"

  AC_SUBST(OPENJDK_TARGET_AUTOCONF_NAME)

  AC_SUBST(OPENJDK_BUILD_AUTOCONF_NAME)

  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU variables.

  PLATFORM_EXTRACT_VARS_FROM_OS($build_os)

  PLATFORM_EXTRACT_VARS_FROM_CPU($build_cpu)

  # ..and setup our own variables. (Do this explicitely to facilitate searching)

  OPENJDK_BUILD_OS="$VAR_OS"

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

    OPENJDK_BUILD_OS_TYPE="$VAR_OS_TYPE"

  else

    OPENJDK_BUILD_OS_TYPE="$VAR_OS"

  fi

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

    OPENJDK_BUILD_OS_ENV="$VAR_OS_ENV"

  else

    OPENJDK_BUILD_OS_ENV="$VAR_OS"

  fi

  OPENJDK_BUILD_CPU="$VAR_CPU"

  OPENJDK_BUILD_CPU_ARCH="$VAR_CPU_ARCH"

  OPENJDK_BUILD_CPU_BITS="$VAR_CPU_BITS"

  OPENJDK_BUILD_CPU_ENDIAN="$VAR_CPU_ENDIAN"

  AC_SUBST(OPENJDK_BUILD_OS)

  AC_SUBST(OPENJDK_BUILD_OS_TYPE)

  AC_SUBST(OPENJDK_BUILD_OS_ENV)

  AC_SUBST(OPENJDK_BUILD_CPU)

  AC_SUBST(OPENJDK_BUILD_CPU_ARCH)

  AC_SUBST(OPENJDK_BUILD_CPU_BITS)

  AC_SUBST(OPENJDK_BUILD_CPU_ENDIAN)

  AC_MSG_CHECKING([openjdk-build os-cpu])

  AC_MSG_RESULT([$OPENJDK_BUILD_OS-$OPENJDK_BUILD_CPU])

  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU variables.

  PLATFORM_EXTRACT_VARS_FROM_OS($host_os)

  PLATFORM_EXTRACT_VARS_FROM_CPU($host_cpu)

  # ... and setup our own variables. (Do this explicitely to facilitate searching)

  OPENJDK_TARGET_OS="$VAR_OS"

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

    OPENJDK_TARGET_OS_TYPE="$VAR_OS_TYPE"

  else

    OPENJDK_TARGET_OS_TYPE="$VAR_OS"

  fi

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

    OPENJDK_TARGET_OS_ENV="$VAR_OS_ENV"

  else

    OPENJDK_TARGET_OS_ENV="$VAR_OS"

  fi

  OPENJDK_TARGET_CPU="$VAR_CPU"

  OPENJDK_TARGET_CPU_ARCH="$VAR_CPU_ARCH"

  OPENJDK_TARGET_CPU_BITS="$VAR_CPU_BITS"

  OPENJDK_TARGET_CPU_ENDIAN="$VAR_CPU_ENDIAN"

  AC_SUBST(OPENJDK_TARGET_OS)

  AC_SUBST(OPENJDK_TARGET_OS_TYPE)

  AC_SUBST(OPENJDK_TARGET_OS_ENV)

  AC_SUBST(OPENJDK_TARGET_CPU)

  AC_SUBST(OPENJDK_TARGET_CPU_ARCH)

  AC_SUBST(OPENJDK_TARGET_CPU_BITS)

  AC_SUBST(OPENJDK_TARGET_CPU_ENDIAN)

  AC_MSG_CHECKING([openjdk-target os-cpu])

  AC_MSG_RESULT([$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU])

])

# Check if a reduced build (32-bit on 64-bit platforms) is requested, and modify behaviour

# accordingly. Must be done after setting up build and target system, but before

# doing anything else with these values.

AC_DEFUN([PLATFORM_SETUP_TARGET_CPU_BITS],

[

  AC_ARG_WITH(target-bits, [AS_HELP_STRING([--with-target-bits],

       [build 32-bit or 64-bit binaries (for platforms that support it), e.g. --with-target-bits=32 @<:@guessed@:>@])])

  # We have three types of compiles:

  # native  == normal compilation, target system == build system

  # cross   == traditional cross compilation, target system != build system; special toolchain needed

  # reduced == using native compilers, but with special flags (e.g. -m32) to produce 32-bit builds on 64-bit machines

  #

  if test "x$OPENJDK_BUILD_AUTOCONF_NAME" != "x$OPENJDK_TARGET_AUTOCONF_NAME"; then

    # We're doing a proper cross-compilation

    COMPILE_TYPE="cross"

  else

    COMPILE_TYPE="native"

  fi

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

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

      AC_MSG_ERROR([It is not possible to combine --with-target-bits=X and proper cross-compilation. Choose either.])

    fi

    if test "x$with_target_bits" = x32 && test "x$OPENJDK_TARGET_CPU_BITS" = x64; then

      # A reduced build is requested

      COMPILE_TYPE="reduced"

      OPENJDK_TARGET_CPU_BITS=32

      if test "x$OPENJDK_TARGET_CPU_ARCH" = "xx86"; then

        OPENJDK_TARGET_CPU=x86

      elif test "x$OPENJDK_TARGET_CPU_ARCH" = "xsparc"; then

        OPENJDK_TARGET_CPU=sparc

      else

        AC_MSG_ERROR([Reduced build (--with-target-bits=32) is only supported on x86_64 and sparcv9])

      fi

    elif test "x$with_target_bits" = x64 && test "x$OPENJDK_TARGET_CPU_BITS" = x32; then

      AC_MSG_ERROR([It is not possible to use --with-target-bits=64 on a 32 bit system. Use proper cross-compilation instead.])

    elif test "x$with_target_bits" = "x$OPENJDK_TARGET_CPU_BITS"; then

      AC_MSG_NOTICE([--with-target-bits are set to build platform address size; argument has no meaning])

    else

      AC_MSG_ERROR([--with-target-bits can only be 32 or 64, you specified $with_target_bits!])

    fi

  fi

  AC_SUBST(COMPILE_TYPE)

  AC_MSG_CHECKING([compilation type])

  AC_MSG_RESULT([$COMPILE_TYPE])

])

# Setup the legacy variables, for controlling the old makefiles.

#

AC_DEFUN([PLATFORM_SETUP_LEGACY_VARS],

[

  # Also store the legacy naming of the cpu.

  # Ie i586 and amd64 instead of x86 and x86_64

  OPENJDK_TARGET_CPU_LEGACY="$OPENJDK_TARGET_CPU"

  if test "x$OPENJDK_TARGET_CPU" = xx86; then

    OPENJDK_TARGET_CPU_LEGACY="i586"

  elif test "x$OPENJDK_TARGET_OS" != xmacosx && test "x$OPENJDK_TARGET_CPU" = xx86_64; then

    # On all platforms except MacOSX replace x86_64 with amd64.

    OPENJDK_TARGET_CPU_LEGACY="amd64"

  fi

  AC_SUBST(OPENJDK_TARGET_CPU_LEGACY)

  # And the second legacy naming of the cpu.

  # Ie i386 and amd64 instead of x86 and x86_64.

  OPENJDK_TARGET_CPU_LEGACY_LIB="$OPENJDK_TARGET_CPU"

  if test "x$OPENJDK_TARGET_CPU" = xx86; then

    OPENJDK_TARGET_CPU_LEGACY_LIB="i386"

  elif test "x$OPENJDK_TARGET_CPU" = xx86_64; then

    OPENJDK_TARGET_CPU_LEGACY_LIB="amd64"

  fi

  AC_SUBST(OPENJDK_TARGET_CPU_LEGACY_LIB)

  # This is the name of the cpu (but using i386 and amd64 instead of

  # x86 and x86_64, respectively), preceeded by a /, to be used when

  # locating libraries. On macosx, it's empty, though.

  OPENJDK_TARGET_CPU_LIBDIR="/$OPENJDK_TARGET_CPU_LEGACY_LIB"

  if test "x$OPENJDK_TARGET_OS" = xmacosx; then

    OPENJDK_TARGET_CPU_LIBDIR=""

  fi

  AC_SUBST(OPENJDK_TARGET_CPU_LIBDIR)

  # OPENJDK_TARGET_CPU_ISADIR is normally empty. On 64-bit Solaris systems, it is set to

  # /amd64 or /sparcv9. This string is appended to some library paths, like this:

  # /usr/lib${OPENJDK_TARGET_CPU_ISADIR}/libexample.so

  OPENJDK_TARGET_CPU_ISADIR=""

  if test "x$OPENJDK_TARGET_OS" = xsolaris; then

    if test "x$OPENJDK_TARGET_CPU" = xx86_64; then

      OPENJDK_TARGET_CPU_ISADIR="/amd64"

    elif test "x$OPENJDK_TARGET_CPU" = xsparcv9; then

      OPENJDK_TARGET_CPU_ISADIR="/sparcv9"

    fi

  fi

  AC_SUBST(OPENJDK_TARGET_CPU_ISADIR)

  # Setup OPENJDK_TARGET_CPU_OSARCH, which is used to set the os.arch Java system property

  OPENJDK_TARGET_CPU_OSARCH="$OPENJDK_TARGET_CPU"

  if test "x$OPENJDK_TARGET_OS" = xlinux && test "x$OPENJDK_TARGET_CPU" = xx86; then

    # On linux only, we replace x86 with i386.

    OPENJDK_TARGET_CPU_OSARCH="i386"

  elif test "x$OPENJDK_TARGET_OS" != xmacosx && test "x$OPENJDK_TARGET_CPU" = xx86_64; then

    # On all platforms except macosx, we replace x86_64 with amd64.

    OPENJDK_TARGET_CPU_OSARCH="amd64"

  fi

  AC_SUBST(OPENJDK_TARGET_CPU_OSARCH)

  OPENJDK_TARGET_CPU_JLI="$OPENJDK_TARGET_CPU"

  if test "x$OPENJDK_TARGET_CPU" = xx86; then

    OPENJDK_TARGET_CPU_JLI="i386"

  elif test "x$OPENJDK_TARGET_OS" != xmacosx && test "x$OPENJDK_TARGET_CPU" = xx86_64; then

    # On all platforms except macosx, we replace x86_64 with amd64.

    OPENJDK_TARGET_CPU_JLI="amd64"

  fi

  # Now setup the -D flags for building libjli.

  OPENJDK_TARGET_CPU_JLI_CFLAGS="-DLIBARCHNAME='\"$OPENJDK_TARGET_CPU_JLI\"'"

  if test "x$OPENJDK_TARGET_OS" = xsolaris; then

    if test "x$OPENJDK_TARGET_CPU_ARCH" = xsparc; then

      OPENJDK_TARGET_CPU_JLI_CFLAGS="$OPENJDK_TARGET_CPU_JLI_CFLAGS -DLIBARCH32NAME='\"sparc\"' -DLIBARCH64NAME='\"sparcv9\"'"

    elif test "x$OPENJDK_TARGET_CPU_ARCH" = xx86; then

      OPENJDK_TARGET_CPU_JLI_CFLAGS="$OPENJDK_TARGET_CPU_JLI_CFLAGS -DLIBARCH32NAME='\"i386\"' -DLIBARCH64NAME='\"amd64\"'"

    fi

  fi

  AC_SUBST(OPENJDK_TARGET_CPU_JLI_CFLAGS)

  if test "x$OPENJDK_TARGET_OS" = xmacosx; then

      OPENJDK_TARGET_OS_EXPORT_DIR=macosx

  else

      OPENJDK_TARGET_OS_EXPORT_DIR=${OPENJDK_TARGET_OS_TYPE}

  fi

  AC_SUBST(OPENJDK_TARGET_OS_EXPORT_DIR)

  if test "x$OPENJDK_TARGET_CPU_BITS" = x64; then

    A_LP64="LP64:="

    # -D_LP64=1 is only set on linux and mac. Setting on windows causes diff in

    # unpack200.exe

    if test "x$OPENJDK_TARGET_OS" = xlinux || test "x$OPENJDK_TARGET_OS" = xmacosx; then

      ADD_LP64="-D_LP64=1"

    fi

  fi

  AC_SUBST(LP64,$A_LP64)

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

    # FIXME: ... or should this include reduced builds..?

    DEFINE_CROSS_COMPILE_ARCH="CROSS_COMPILE_ARCH:=$OPENJDK_TARGET_CPU_LEGACY"

  else

    DEFINE_CROSS_COMPILE_ARCH=""

  fi

  AC_SUBST(DEFINE_CROSS_COMPILE_ARCH)

  # ZERO_ARCHDEF is used to enable architecture-specific code

  case "${OPENJDK_TARGET_CPU}" in

    ppc)     ZERO_ARCHDEF=PPC32 ;;

    ppc64)   ZERO_ARCHDEF=PPC64 ;;

    s390*)   ZERO_ARCHDEF=S390  ;;

    sparc*)  ZERO_ARCHDEF=SPARC ;;

    x86_64*) ZERO_ARCHDEF=AMD64 ;;

    x86)     ZERO_ARCHDEF=IA32  ;;

    *)      ZERO_ARCHDEF=$(echo "${OPENJDK_TARGET_CPU_LEGACY_LIB}" | tr a-z A-Z)

  esac

  AC_SUBST(ZERO_ARCHDEF)

])

AC_DEFUN([PLATFORM_SET_RELEASE_FILE_OS_VALUES],

[

  if test "x$OPENJDK_TARGET_OS" = "xsolaris"; then

    REQUIRED_OS_NAME=SunOS

    REQUIRED_OS_VERSION=5.10

  fi

  if test "x$OPENJDK_TARGET_OS" = "xlinux"; then

    REQUIRED_OS_NAME=Linux

    REQUIRED_OS_VERSION=2.6

  fi

  if test "x$OPENJDK_TARGET_OS" = "xwindows"; then

    REQUIRED_OS_NAME=Windows

    if test "x$OPENJDK_TARGET_CPU_BITS" = "x64"; then

      REQUIRED_OS_VERSION=5.2

    else

      REQUIRED_OS_VERSION=5.1

    fi

  fi

  if test "x$OPENJDK_TARGET_OS" = "xmacosx"; then

    REQUIRED_OS_NAME=Darwin

    REQUIRED_OS_VERSION=11.2

  fi

  AC_SUBST(REQUIRED_OS_NAME)

  AC_SUBST(REQUIRED_OS_VERSION)

])

#%%% Build and target systems %%%

AC_DEFUN_ONCE([PLATFORM_SETUP_OPENJDK_BUILD_AND_TARGET],

[

  # Figure out the build and target systems. # Note that in autoconf terminology, "build" is obvious, but "target"

  # is confusing; it assumes you are cross-compiling a cross-compiler (!)  and "target" is thus the target of the

  # product you're building. The target of this build is called "host". Since this is confusing to most people, we

  # have not adopted that system, but use "target" as the platform we are building for. In some places though we need

  # to use the configure naming style.

  AC_CANONICAL_BUILD

  AC_CANONICAL_HOST

  AC_CANONICAL_TARGET

  PLATFORM_EXTRACT_TARGET_AND_BUILD

  PLATFORM_SETUP_TARGET_CPU_BITS

  PLATFORM_SET_RELEASE_FILE_OS_VALUES

  PLATFORM_SETUP_LEGACY_VARS

])

AC_DEFUN_ONCE([PLATFORM_SETUP_OPENJDK_BUILD_OS_VERSION],

[

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

  # Note that this is the build platform OS version!

  OS_VERSION="`uname -r | ${SED} 's!\.! !g' | ${SED} 's!-! !g'`"

  OS_VERSION_MAJOR="`${ECHO} ${OS_VERSION} | ${CUT} -f 1 -d ' '`"

  OS_VERSION_MINOR="`${ECHO} ${OS_VERSION} | ${CUT} -f 2 -d ' '`"

  OS_VERSION_MICRO="`${ECHO} ${OS_VERSION} | ${CUT} -f 3 -d ' '`"

  AC_SUBST(OS_VERSION_MAJOR)

  AC_SUBST(OS_VERSION_MINOR)

  AC_SUBST(OS_VERSION_MICRO)

])

# Support macro for PLATFORM_SETUP_OPENJDK_TARGET_BITS.

# Add -mX to various FLAGS variables.

AC_DEFUN([PLATFORM_SET_COMPILER_TARGET_BITS_FLAGS],

[

  # When we add flags to the "official" CFLAGS etc, we need to

  # keep track of these additions in ADDED_CFLAGS etc. These

  # will later be checked to make sure only controlled additions

  # have been made to CFLAGS etc.

  ADDED_CFLAGS=" ${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}"

  ADDED_CXXFLAGS=" ${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}"

  ADDED_LDFLAGS=" ${COMPILER_TARGET_BITS_FLAG}${OPENJDK_TARGET_CPU_BITS}"

  CFLAGS="${CFLAGS}${ADDED_CFLAGS}"

  CXXFLAGS="${CXXFLAGS}${ADDED_CXXFLAGS}"

  LDFLAGS="${LDFLAGS}${ADDED_LDFLAGS}"

  CFLAGS_JDK="${CFLAGS_JDK}${ADDED_CFLAGS}"

  CXXFLAGS_JDK="${CXXFLAGS_JDK}${ADDED_CXXFLAGS}"

  LDFLAGS_JDK="${LDFLAGS_JDK}${ADDED_LDFLAGS}"

])

AC_DEFUN_ONCE([PLATFORM_SETUP_OPENJDK_TARGET_BITS],

[

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

  #

  # Now we check if libjvm.so will use 32 or 64 bit pointers for the C/C++ code.

  # (The JVM can use 32 or 64 bit Java pointers but that decision

  # is made at runtime.)

  #

  if test "x$OPENJDK_TARGET_OS" = xsolaris || test "x$OPENJDK_TARGET_OS" = xaix; then

    # Always specify -m flag on Solaris

    # And -q on AIX because otherwise the compiler produces 32-bit objects by default

    PLATFORM_SET_COMPILER_TARGET_BITS_FLAGS

  elif test "x$COMPILE_TYPE" = xreduced; then

    if test "x$OPENJDK_TARGET_OS_TYPE" = xunix; then

      # Specify -m if running reduced on unix platforms

      PLATFORM_SET_COMPILER_TARGET_BITS_FLAGS

    fi

  fi

  # Make compilation sanity check

  AC_CHECK_HEADERS([stdio.h], , [

    AC_MSG_NOTICE([Failed to compile stdio.h. This likely implies missing compile dependencies.])

    if test "x$COMPILE_TYPE" = xreduced; then

      AC_MSG_NOTICE([You are doing a reduced build. Check that you have 32-bit libraries installed.])

    elif test "x$COMPILE_TYPE" = xcross; then

      AC_MSG_NOTICE([You are doing a cross-compilation. Check that you have all target platform libraries installed.])

    fi

    AC_MSG_ERROR([Cannot continue.])

  ])