#

# Copyright (c) 2011, 2016, 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.

#

AC_DEFUN([BASIC_WINDOWS_REWRITE_AS_UNIX_PATH],

[

  windows_path="[$]$1"

  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then

    unix_path=`$CYGPATH -u "$windows_path"`

    $1="$unix_path"

  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then

    unix_path=`$ECHO "$windows_path" | $SED -e 's,^\\(.\\):,/\\1,g' -e 's,\\\\,/,g'`

    $1="$unix_path"

  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then

    # wslpath does not check the input, only call if an actual windows path was

    # given.

    if $ECHO "$windows_path" | $GREP -q ["^[a-zA-Z]:[\\\\/]"]; then

      unix_path=`$WSLPATH -u "$windows_path"`

      $1="$unix_path"

    fi

  fi

])

AC_DEFUN([BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH],

[

  unix_path="[$]$1"

  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then

    windows_path=`$CYGPATH -m "$unix_path"`

    $1="$windows_path"

  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then

    windows_path=`cmd //c echo $unix_path`

    $1="$windows_path"

  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then

    windows_path=`$WSLPATH -m "$unix_path"`

    $1="$windows_path"

  fi

])

# Helper function which possibly converts a path using DOS-style short mode.

# If so, the updated path is stored in $new_path.

# $1: The path to check

AC_DEFUN([BASIC_MAKE_WINDOWS_SPACE_SAFE_CYGWIN],

[

  input_path="$1"

  # Check if we need to convert this using DOS-style short mode. If the path

  # contains just simple characters, use it. Otherwise (spaces, weird characters),

  # take no chances and rewrite it.

  # Note: m4 eats our [], so we need to use @<:@ and @:>@ instead.

  has_forbidden_chars=`$ECHO "$input_path" | $GREP @<:@^-._/a-zA-Z0-9@:>@`

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

    # Now convert it to mixed DOS-style, short mode (no spaces, and / instead of \)

    shortmode_path=`$CYGPATH -s -m -a "$input_path"`

    path_after_shortmode=`$CYGPATH -u "$shortmode_path"`

    if test "x$path_after_shortmode" != "x$input_to_shortpath"; then

      # Going to short mode and back again did indeed matter. Since short mode is

      # case insensitive, let's make it lowercase to improve readability.

      shortmode_path=`$ECHO "$shortmode_path" | $TR 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`

      # Now convert it back to Unix-style (cygpath)

      input_path=`$CYGPATH -u "$shortmode_path"`

      new_path="$input_path"

    fi

  fi

  test_cygdrive_prefix=`$ECHO $input_path | $GREP ^/cygdrive/`

  if test "x$test_cygdrive_prefix" = x; then

    # As a simple fix, exclude /usr/bin since it's not a real path.

    if test "x`$ECHO $1 | $GREP ^/usr/bin/`" = x; then

      # The path is in a Cygwin special directory (e.g. /home). We need this converted to

      # a path prefixed by /cygdrive for fixpath to work.

      new_path="$CYGWIN_ROOT_PATH$input_path"

    fi

  fi

])

# Helper function which possibly converts a path using DOS-style short mode.

# If so, the updated path is stored in $new_path.

# $1: The path to check

AC_DEFUN([BASIC_MAKE_WINDOWS_SPACE_SAFE_MSYS],

[

  input_path="$1"

  # Check if we need to convert this using DOS-style short mode. If the path

  # contains just simple characters, use it. Otherwise (spaces, weird characters),

  # take no chances and rewrite it.

  # Note: m4 eats our [], so we need to use @<:@ and @:>@ instead.

  has_forbidden_chars=`$ECHO "$input_path" | $GREP @<:@^-_/:a-zA-Z0-9@:>@`

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

    # Now convert it to mixed DOS-style, short mode (no spaces, and / instead of \)

    new_path=`cmd /c "for %A in (\"$input_path\") do @echo %~sA"|$TR \\\\\\\\ / | $TR 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`

  fi

])

# Helper function which possibly converts a path using DOS-style short mode.

# If so, the updated path is stored in $new_path.

# $1: The path to check

AC_DEFUN([BASIC_MAKE_WINDOWS_SPACE_SAFE_WSL],

[

  input_path="$1"

  # Check if we need to convert this using DOS-style short mode. If the path

  # contains just simple characters, use it. Otherwise (spaces, weird characters),

  # take no chances and rewrite it.

  # Note: m4 eats our [], so we need to use @<:@ and @:>@ instead.

  has_forbidden_chars=`$ECHO "$input_path" | $GREP [[^-_/:a-zA-Z0-9\\.]]`

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

    # Now convert it to mixed DOS-style, short mode (no spaces, and / instead of \)

    TOPDIR_windows="$TOPDIR"

    BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH([TOPDIR_windows])

    # First convert to Windows path to make input valid for cmd

    BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH([input_path])

    new_path=`$CMD /c $TOPDIR_windows/make/scripts/windowsShortName.bat "$input_path" \

        | $SED -e 's|\r||g' \

        | $TR \\\\\\\\ / | $TR 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`

    # Rewrite back to unix style

    BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([new_path])

  fi

])

# FIXME: The BASIC_FIXUP_*_CYGWIN/MSYS is most likely too convoluted

# and could probably be heavily simplified. However, all changes in this

# area tend to need lot of testing in different scenarios, and in lack of

# proper unit testing, cleaning this up has not been deemed worth the effort

# at the moment.

AC_DEFUN([BASIC_FIXUP_PATH_CYGWIN],

[

  # Input might be given as Windows format, start by converting to

  # unix format.

  path="[$]$1"

  new_path=`$CYGPATH -u "$path"`

  # Cygwin tries to hide some aspects of the Windows file system, such that binaries are

  # named .exe but called without that suffix. Therefore, "foo" and "foo.exe" are considered

  # the same file, most of the time (as in "test -f"). But not when running cygpath -s, then

  # "foo.exe" is OK but "foo" is an error.

  #

  # This test is therefore slightly more accurate than "test -f" to check for file precense.

  # It is also a way to make sure we got the proper file name for the real test later on.

  test_shortpath=`$CYGPATH -s -m "$new_path" 2> /dev/null`

  if test "x$test_shortpath" = x; then

    AC_MSG_NOTICE([The path of $1, which resolves as "$path", is invalid.])

    AC_MSG_ERROR([Cannot locate the the path of $1])

  fi

  # Call helper function which possibly converts this using DOS-style short mode.

  # If so, the updated path is stored in $new_path.

  BASIC_MAKE_WINDOWS_SPACE_SAFE_CYGWIN([$new_path])

  if test "x$path" != "x$new_path"; then

    $1="$new_path"

    AC_MSG_NOTICE([Rewriting $1 to "$new_path"])

  fi

])

AC_DEFUN([BASIC_FIXUP_PATH_MSYS],

[

  path="[$]$1"

  has_colon=`$ECHO $path | $GREP ^.:`

  new_path="$path"

  if test "x$has_colon" = x; then

    # Not in mixed or Windows style, start by that.

    new_path=`cmd //c echo $path`

  fi

  BASIC_MAKE_WINDOWS_SPACE_SAFE_MSYS([$new_path])

  BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(new_path)

  if test "x$path" != "x$new_path"; then

    $1="$new_path"

    AC_MSG_NOTICE([Rewriting $1 to "$new_path"])

  fi

  # Save the first 10 bytes of this path to the storage, so fixpath can work.

  all_fixpath_prefixes=("${all_fixpath_prefixes@<:@@@:>@}" "${new_path:0:10}")

])

AC_DEFUN([BASIC_FIXUP_PATH_WSL],

[

  # Input might be given as Windows format, start by converting to

  # unix format.

  new_path="[$]$1"

  BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([new_path])

  # Call helper function which possibly converts this using DOS-style short mode.

  # If so, the updated path is stored in $new_path.

  BASIC_MAKE_WINDOWS_SPACE_SAFE_WSL([$new_path])

  if test "x$path" != "x$new_path"; then

    $1="$new_path"

    AC_MSG_NOTICE([Rewriting $1 to "$new_path"])

  fi

])

AC_DEFUN([BASIC_FIXUP_EXECUTABLE_CYGWIN],

[

  # First separate the path from the arguments. This will split at the first

  # space.

  complete="[$]$1"

  path="${complete%% *}"

  tmp="$complete EOL"

  arguments="${tmp#* }"

  # Input might be given as Windows format, start by converting to

  # unix format.

  new_path=`$CYGPATH -u "$path"`

  # Now try to locate executable using which

  new_path=`$WHICH "$new_path" 2> /dev/null`

  # bat and cmd files are not always considered executable in cygwin causing which

  # to not find them

  if test "x$new_path" = x \

      && test "x`$ECHO \"$path\" | $GREP -i -e \"\\.bat$\" -e \"\\.cmd$\"`" != x \

      && test "x`$LS \"$path\" 2>/dev/null`" != x; then

    new_path=`$CYGPATH -u "$path"`

  fi

  if test "x$new_path" = x; then

    # Oops. Which didn't find the executable.

    # The splitting of arguments from the executable at a space might have been incorrect,

    # since paths with space are more likely in Windows. Give it another try with the whole

    # argument.

    path="$complete"

    arguments="EOL"

    new_path=`$CYGPATH -u "$path"`

    new_path=`$WHICH "$new_path" 2> /dev/null`

    # bat and cmd files are not always considered executable in cygwin causing which

    # to not find them

    if test "x$new_path" = x \

        && test "x`$ECHO \"$path\" | $GREP -i -e \"\\.bat$\" -e \"\\.cmd$\"`" != x \

        && test "x`$LS \"$path\" 2>/dev/null`" != x; then

      new_path=`$CYGPATH -u "$path"`

    fi

    if test "x$new_path" = x; then

      # It's still not found. Now this is an unrecoverable error.

      AC_MSG_NOTICE([The path of $1, which resolves as "$complete", is not found.])

      has_space=`$ECHO "$complete" | $GREP " "`

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

        AC_MSG_NOTICE([You might be mixing spaces in the path and extra arguments, which is not allowed.])

      fi

      AC_MSG_ERROR([Cannot locate the the path of $1])

    fi

  fi

  # Cygwin tries to hide some aspects of the Windows file system, such that binaries are

  # named .exe but called without that suffix. Therefore, "foo" and "foo.exe" are considered

  # the same file, most of the time (as in "test -f"). But not when running cygpath -s, then

  # "foo.exe" is OK but "foo" is an error.

  #

  # This test is therefore slightly more accurate than "test -f" to check for file presence.

  # It is also a way to make sure we got the proper file name for the real test later on.

  test_shortpath=`$CYGPATH -s -m "$new_path" 2> /dev/null`

  if test "x$test_shortpath" = x; then

    # Short path failed, file does not exist as specified.

    # Try adding .exe or .cmd

    if test -f "${new_path}.exe"; then

      input_to_shortpath="${new_path}.exe"

    elif test -f "${new_path}.cmd"; then

      input_to_shortpath="${new_path}.cmd"

    else

      AC_MSG_NOTICE([The path of $1, which resolves as "$new_path", is invalid.])

      AC_MSG_NOTICE([Neither "$new_path" nor "$new_path.exe/cmd" can be found])

      AC_MSG_ERROR([Cannot locate the the path of $1])

    fi

  else

    input_to_shortpath="$new_path"

  fi

  # Call helper function which possibly converts this using DOS-style short mode.

  # If so, the updated path is stored in $new_path.

  new_path="$input_to_shortpath"

  BASIC_MAKE_WINDOWS_SPACE_SAFE_CYGWIN([$input_to_shortpath])

  # remove trailing .exe if any

  new_path="${new_path/%.exe/}"

])

AC_DEFUN([BASIC_FIXUP_EXECUTABLE_MSYS],

[

  # First separate the path from the arguments. This will split at the first

  # space.

  complete="[$]$1"

  path="${complete%% *}"

  tmp="$complete EOL"

  arguments="${tmp#* }"

  # Input might be given as Windows format, start by converting to

  # unix format.

  new_path="$path"

  BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(new_path)

  # Now try to locate executable using which

  new_path=`$WHICH "$new_path" 2> /dev/null`

  if test "x$new_path" = x; then

    # Oops. Which didn't find the executable.

    # The splitting of arguments from the executable at a space might have been incorrect,

    # since paths with space are more likely in Windows. Give it another try with the whole

    # argument.

    path="$complete"

    arguments="EOL"

    new_path="$path"

    BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(new_path)

    new_path=`$WHICH "$new_path" 2> /dev/null`

    # bat and cmd files are not always considered executable in MSYS causing which

    # to not find them

    if test "x$new_path" = x \

        && test "x`$ECHO \"$path\" | $GREP -i -e \"\\.bat$\" -e \"\\.cmd$\"`" != x \

        && test "x`$LS \"$path\" 2>/dev/null`" != x; then

      new_path="$path"

      BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(new_path)

    fi

    if test "x$new_path" = x; then

      # It's still not found. Now this is an unrecoverable error.

      AC_MSG_NOTICE([The path of $1, which resolves as "$complete", is not found.])

      has_space=`$ECHO "$complete" | $GREP " "`

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

        AC_MSG_NOTICE([You might be mixing spaces in the path and extra arguments, which is not allowed.])

      fi

      AC_MSG_ERROR([Cannot locate the the path of $1])

    fi

  fi

  # Now new_path has a complete unix path to the binary

  if test "x`$ECHO $new_path | $GREP ^/bin/`" != x; then

    # Keep paths in /bin as-is, but remove trailing .exe if any

    new_path="${new_path/%.exe/}"

    # Do not save /bin paths to all_fixpath_prefixes!

  else

    # Not in mixed or Windows style, start by that.

    new_path=`cmd //c echo $new_path`

    BASIC_MAKE_WINDOWS_SPACE_SAFE_MSYS([$new_path])

    # Output is in $new_path

    BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(new_path)

    # remove trailing .exe if any

    new_path="${new_path/%.exe/}"

    # Save the first 10 bytes of this path to the storage, so fixpath can work.

    all_fixpath_prefixes=("${all_fixpath_prefixes@<:@@@:>@}" "${new_path:0:10}")

  fi

])

AC_DEFUN([BASIC_FIXUP_EXECUTABLE_WSL],

[

  # First separate the path from the arguments. This will split at the first

  # space.

  complete="[$]$1"

  path="${complete%% *}"

  tmp="$complete EOL"

  arguments="${tmp#* }"

  # Input might be given as Windows format, start by converting to

  # unix format.

  new_path="$path"

  BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([new_path])

  # Now try to locate executable using which

  new_path_bak="$new_path"

  new_path=`$WHICH "$new_path" 2> /dev/null`

  # bat and cmd files are not considered executable in WSL

  if test "x$new_path" = x \

      && test "x`$ECHO \"$path\" | $GREP -i -e \"\\.bat$\" -e \"\\.cmd$\"`" != x \

      && test "x`$LS \"$path\" 2>/dev/null`" != x; then

    new_path="$new_path_back"

  fi

  if test "x$new_path" = x; then

    # Oops. Which didn't find the executable.

    # The splitting of arguments from the executable at a space might have been incorrect,

    # since paths with space are more likely in Windows. Give it another try with the whole

    # argument.

    path="$complete"

    arguments="EOL"

    new_path="$path"

    BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([new_path])

    new_path_bak="$new_path"

    new_path=`$WHICH "$new_path" 2> /dev/null`

    # bat and cmd files are not considered executable in WSL

    if test "x$new_path" = x \

        && test "x`$ECHO \"$path\" | $GREP -i -e \"\\.bat$\" -e \"\\.cmd$\"`" != x \

        && test "x`$LS \"$path\" 2>/dev/null`" != x; then

      new_path="$new_path_bak"

    fi

    if test "x$new_path" = x; then

      # It's still not found. Now this is an unrecoverable error.

      AC_MSG_NOTICE([The path of $1, which resolves as "$complete", is not found.])

      has_space=`$ECHO "$complete" | $GREP " "`

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

        AC_MSG_NOTICE([You might be mixing spaces in the path and extra arguments, which is not allowed.])

      fi

      AC_MSG_ERROR([Cannot locate the the path of $1])

    fi

  fi

  # In WSL, suffixes must be present for Windows executables

  if test ! -f "$new_path"; then

    # Try adding .exe or .cmd

    if test -f "${new_path}.exe"; then

      input_to_shortpath="${new_path}.exe"

    elif test -f "${new_path}.cmd"; then

      input_to_shortpath="${new_path}.cmd"

    else

      AC_MSG_NOTICE([The path of $1, which resolves as "$new_path", is invalid.])

      AC_MSG_NOTICE([Neither "$new_path" nor "$new_path.exe/cmd" can be found])

      AC_MSG_ERROR([Cannot locate the the path of $1])

    fi

  else

    input_to_shortpath="$new_path"

  fi

  # Call helper function which possibly converts this using DOS-style short mode.

  # If so, the updated path is stored in $new_path.

  new_path="$input_to_shortpath"

  BASIC_MAKE_WINDOWS_SPACE_SAFE_WSL([$input_to_shortpath])

])

# Setup basic configuration paths, and platform-specific stuff related to PATHs.

AC_DEFUN([BASIC_CHECK_PATHS_WINDOWS],

[

  SRC_ROOT_LENGTH=`$THEPWDCMD -L|$WC -m`

  if test $SRC_ROOT_LENGTH -gt 100; then

    AC_MSG_ERROR([Your base path is too long. It is $SRC_ROOT_LENGTH characters long, but only 100 is supported])

  fi

  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then

    AC_MSG_CHECKING([cygwin release])

    CYGWIN_VERSION=`$UNAME -r`

    AC_MSG_RESULT([$CYGWIN_VERSION])

    WINDOWS_ENV_VENDOR='cygwin'

    WINDOWS_ENV_VERSION="$CYGWIN_VERSION"

    CYGWIN_VERSION_OLD=`$ECHO $CYGWIN_VERSION | $GREP -e '^1\.[0-6]'`

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

      AC_MSG_NOTICE([Your cygwin is too old. You are running $CYGWIN_VERSION, but at least cygwin 1.7 is required. Please upgrade.])

      AC_MSG_ERROR([Cannot continue])

    fi

    if test "x$CYGPATH" = x; then

      AC_MSG_ERROR([Something is wrong with your cygwin installation since I cannot find cygpath.exe in your path])

    fi

    AC_MSG_CHECKING([cygwin root directory as unix-style path])

    # The cmd output ends with Windows line endings (CR/LF)

    cygwin_winpath_root=`cd / ; cmd /c cd | $TR -d '\r\n'`

    # Force cygpath to report the proper root by including a trailing space, and then stripping it off again.

    CYGWIN_ROOT_PATH=`$CYGPATH -u "$cygwin_winpath_root " | $CUT -f 1 -d " "`

    AC_MSG_RESULT([$CYGWIN_ROOT_PATH])

    WINDOWS_ENV_ROOT_PATH="$CYGWIN_ROOT_PATH"

    test_cygdrive_prefix=`$ECHO $CYGWIN_ROOT_PATH | $GREP ^/cygdrive/`

    if test "x$test_cygdrive_prefix" = x; then

      AC_MSG_ERROR([Your cygdrive prefix is not /cygdrive. This is currently not supported. Change with mount -c.])

    fi

  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then

    AC_MSG_CHECKING([msys release])

    MSYS_VERSION=`$UNAME -r`

    AC_MSG_RESULT([$MSYS_VERSION])

    WINDOWS_ENV_VENDOR='msys'

    WINDOWS_ENV_VERSION="$MSYS_VERSION"

    AC_MSG_CHECKING([msys root directory as unix-style path])

    # The cmd output ends with Windows line endings (CR/LF), the grep command will strip that away

    MSYS_ROOT_PATH=`cd / ; cmd /c cd | $GREP ".*"`

    BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(MSYS_ROOT_PATH)

    AC_MSG_RESULT([$MSYS_ROOT_PATH])

    WINDOWS_ENV_ROOT_PATH="$MSYS_ROOT_PATH"

  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then

    AC_MSG_CHECKING([Windows version])

    # m4 replaces [ and ] so we use @<:@ and @:>@ instead

    WINDOWS_VERSION=`$CMD /c ver.exe | $EGREP -o '(@<:@0-9@:>@+\.)+@<:@0-9@:>@+'`

    AC_MSG_RESULT([$WINDOWS_VERSION])

    AC_MSG_CHECKING([WSL kernel version])

    WSL_KERNEL_VERSION=`$UNAME -v`

    AC_MSG_RESULT([$WSL_KERNEL_VERSION])

    AC_MSG_CHECKING([WSL kernel release])

    WSL_KERNEL_RELEASE=`$UNAME -r`

    AC_MSG_RESULT([$WSL_KERNEL_RELEASE])

    AC_MSG_CHECKING([WSL distribution])

    WSL_DISTRIBUTION=`$LSB_RELEASE -d | sed 's/Description:\t//'`

    AC_MSG_RESULT([$WSL_DISTRIBUTION])

    WINDOWS_ENV_VENDOR='WSL'

    WINDOWS_ENV_VERSION="$WSL_DISTRIBUTION $WSL_KERNEL_VERSION $WSL_KERNEL_RELEASE (on Windows build $WINDOWS_VERSION)"

  else

    AC_MSG_ERROR([Unknown Windows environment. Neither cygwin, msys, nor wsl was detected.])

  fi

  # Test if windows or unix (cygwin/msys) find is first in path.

  AC_MSG_CHECKING([what kind of 'find' is first on the PATH])

  FIND_BINARY_OUTPUT=`find --version 2>&1`

  if test "x`echo $FIND_BINARY_OUTPUT | $GREP GNU`" != x; then

    AC_MSG_RESULT([unix style])

  elif test "x`echo $FIND_BINARY_OUTPUT | $GREP FIND`" != x; then

    AC_MSG_RESULT([Windows])

    AC_MSG_NOTICE([Your path contains Windows tools (C:\Windows\system32) before your unix (cygwin or msys) tools.])