Failed to save the file to the "xx" directory.

Failed to save the file to the "ll" directory.

Failed to save the file to the "mm" directory.

Failed to save the file to the "wp" directory.

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Current File : /opt/alt/ruby33/share/ruby/mkmf.rb
# -*- coding: us-ascii -*-
# frozen-string-literal: false
# module to create Makefile for extension modules
# invoke like: ruby -r mkmf extconf.rb

require 'rbconfig'
require 'fileutils'
require 'shellwords'

class String # :nodoc:
  # Wraps a string in escaped quotes if it contains whitespace.
  def quote
    /\s/ =~ self ? "\"#{self}\"" : "#{self}"
  end

  # Escape whitespaces for Makefile.
  def unspace
    gsub(/\s/, '\\\\\\&')
  end

  # Generates a string used as cpp macro name.
  def tr_cpp
    strip.upcase.tr_s("^A-Z0-9_*", "_").tr_s("*", "P")
  end

  def funcall_style
    /\)\z/ =~ self ? dup : "#{self}()"
  end

  def sans_arguments
    self[/\A[^()]+/]
  end
end

class Array # :nodoc:
  # Wraps all strings in escaped quotes if they contain whitespace.
  def quote
    map {|s| s.quote}
  end
end

##
# mkmf.rb is used by Ruby C extensions to generate a Makefile which will
# correctly compile and link the C extension to Ruby and a third-party
# library.
module MakeMakefile
  #### defer until this module become global-state free.
  # def self.extended(obj)
  #   obj.init_mkmf
  #   super
  # end
  #
  # def initialize(*args, rbconfig: RbConfig, **rest)
  #   init_mkmf(rbconfig::MAKEFILE_CONFIG, rbconfig::CONFIG)
  #   super(*args, **rest)
  # end

  ##
  # The makefile configuration using the defaults from when Ruby was built.

  CONFIG = RbConfig::MAKEFILE_CONFIG
  ORIG_LIBPATH = ENV['LIB']

  ##
  # Extensions for files compiled with a C compiler

  C_EXT = %w[c m]

  ##
  # Extensions for files compiled with a C++ compiler

  CXX_EXT = %w[cc mm cxx cpp]
  unless File.exist?(File.join(*File.split(__FILE__).tap {|d, b| b.swapcase}))
    CXX_EXT.concat(%w[C])
  end

  ##
  # Extensions for source files

  SRC_EXT = C_EXT + CXX_EXT

  ##
  # Extensions for header files

  HDR_EXT = %w[h hpp]
  $static = nil
  $config_h = '$(arch_hdrdir)/ruby/config.h'
  $default_static = $static

  unless defined? $configure_args
    $configure_args = {}
    args = CONFIG["configure_args"].shellsplit
    if arg = ENV["CONFIGURE_ARGS"]
      args.push(*arg.shellsplit)
    end
    args.delete_if {|a| /\A--(?:top(?:src)?|src|cur)dir(?=\z|=)/ =~ a}
    for arg in args.concat(ARGV)
      arg, val = arg.split('=', 2)
      next unless arg
      arg.tr!('_', '-')
      if arg.sub!(/\A(?!--)/, '--')
        val or next
        arg.downcase!
      end
      $configure_args[arg] = val || true
    end
  end

  $libdir = CONFIG["libdir"]
  $rubylibdir = CONFIG["rubylibdir"]
  $archdir = CONFIG["archdir"]
  $sitedir = CONFIG["sitedir"]
  $sitelibdir = CONFIG["sitelibdir"]
  $sitearchdir = CONFIG["sitearchdir"]
  $vendordir = CONFIG["vendordir"]
  $vendorlibdir = CONFIG["vendorlibdir"]
  $vendorarchdir = CONFIG["vendorarchdir"]

  $mswin = /mswin/ =~ RUBY_PLATFORM
  $mingw = /mingw/ =~ RUBY_PLATFORM
  $cygwin = /cygwin/ =~ RUBY_PLATFORM
  $netbsd = /netbsd/ =~ RUBY_PLATFORM
  $haiku = /haiku/ =~ RUBY_PLATFORM
  $solaris = /solaris/ =~ RUBY_PLATFORM
  $universal = /universal/ =~ RUBY_PLATFORM
  $dest_prefix_pattern = (File::PATH_SEPARATOR == ';' ? /\A([[:alpha:]]:)?/ : /\A/)

  # :stopdoc:

  def config_string(key, config = CONFIG)
    s = config[key] and !s.empty? and block_given? ? yield(s) : s
  end
  module_function :config_string

  def dir_re(dir)
    Regexp.new('\$(?:\('+dir+'\)|\{'+dir+'\})(?:\$(?:\(target_prefix\)|\{target_prefix\}))?')
  end
  module_function :dir_re

  def relative_from(path, base)
    dir = File.join(path, "")
    if File.expand_path(dir) == File.expand_path(dir, base)
      path
    else
      File.join(base, path)
    end
  end

  INSTALL_DIRS = [
    [dir_re('commondir'), "$(RUBYCOMMONDIR)"],
    [dir_re('sitedir'), "$(RUBYCOMMONDIR)"],
    [dir_re('vendordir'), "$(RUBYCOMMONDIR)"],
    [dir_re('rubylibdir'), "$(RUBYLIBDIR)"],
    [dir_re('archdir'), "$(RUBYARCHDIR)"],
    [dir_re('sitelibdir'), "$(RUBYLIBDIR)"],
    [dir_re('vendorlibdir'), "$(RUBYLIBDIR)"],
    [dir_re('sitearchdir'), "$(RUBYARCHDIR)"],
    [dir_re('vendorarchdir'), "$(RUBYARCHDIR)"],
    [dir_re('rubyhdrdir'), "$(RUBYHDRDIR)"],
    [dir_re('sitehdrdir'), "$(SITEHDRDIR)"],
    [dir_re('vendorhdrdir'), "$(VENDORHDRDIR)"],
    [dir_re('bindir'), "$(BINDIR)"],
  ]

  def install_dirs(target_prefix = nil)
    if $extout and $extmk
      dirs = [
        ['BINDIR',        '$(extout)/bin'],
        ['RUBYCOMMONDIR', '$(extout)/common'],
        ['RUBYLIBDIR',    '$(RUBYCOMMONDIR)$(target_prefix)'],
        ['RUBYARCHDIR',   '$(extout)/$(arch)$(target_prefix)'],
        ['HDRDIR',        '$(extout)/include/ruby$(target_prefix)'],
        ['ARCHHDRDIR',    '$(extout)/include/$(arch)/ruby$(target_prefix)'],
        ['extout',        "#$extout"],
        ['extout_prefix', "#$extout_prefix"],
      ]
    elsif $extmk
      dirs = [
        ['BINDIR',        '$(bindir)'],
        ['RUBYCOMMONDIR', '$(rubylibdir)'],
        ['RUBYLIBDIR',    '$(rubylibdir)$(target_prefix)'],
        ['RUBYARCHDIR',   '$(archdir)$(target_prefix)'],
        ['HDRDIR',        '$(rubyhdrdir)/ruby$(target_prefix)'],
        ['ARCHHDRDIR',    '$(rubyhdrdir)/$(arch)/ruby$(target_prefix)'],
      ]
    elsif $configure_args.has_key?('--vendor')
      dirs = [
        ['BINDIR',        '$(bindir)'],
        ['RUBYCOMMONDIR', '$(vendordir)$(target_prefix)'],
        ['RUBYLIBDIR',    '$(vendorlibdir)$(target_prefix)'],
        ['RUBYARCHDIR',   '$(vendorarchdir)$(target_prefix)'],
        ['HDRDIR',        '$(vendorhdrdir)$(target_prefix)'],
        ['ARCHHDRDIR',    '$(vendorarchhdrdir)$(target_prefix)'],
      ]
    else
      dirs = [
        ['BINDIR',        '$(bindir)'],
        ['RUBYCOMMONDIR', '$(sitedir)$(target_prefix)'],
        ['RUBYLIBDIR',    '$(sitelibdir)$(target_prefix)'],
        ['RUBYARCHDIR',   '$(sitearchdir)$(target_prefix)'],
        ['HDRDIR',        '$(sitehdrdir)$(target_prefix)'],
        ['ARCHHDRDIR',    '$(sitearchhdrdir)$(target_prefix)'],
      ]
    end
    dirs << ['target_prefix', (target_prefix ? "/#{target_prefix}" : "")]
    dirs
  end

  def map_dir(dir, map = nil)
    map ||= INSTALL_DIRS
    map.inject(dir) {|d, (orig, new)| d.gsub(orig, new)}
  end

  topdir = File.dirname(File.dirname(__FILE__))
  path = File.expand_path($0)
  until (dir = File.dirname(path)) == path
    if File.identical?(dir, topdir)
      $extmk = true if %r"\A(?:ext|enc|tool|test)\z" =~ File.basename(path)
      break
    end
    path = dir
  end
  $extmk ||= false
  if not $extmk and File.exist?(($hdrdir = RbConfig::CONFIG["rubyhdrdir"]) + "/ruby/ruby.h")
    $topdir = $hdrdir
    $top_srcdir = $hdrdir
    $arch_hdrdir = RbConfig::CONFIG["rubyarchhdrdir"]
  elsif File.exist?(($hdrdir = ($top_srcdir ||= topdir) + "/include")  + "/ruby.h")
    $topdir ||= RbConfig::CONFIG["topdir"]
    $arch_hdrdir = "$(extout)/include/$(arch)"
  else
    abort <<MESSAGE
mkmf.rb can't find header files for ruby at #{$hdrdir}/ruby.h

You might have to install separate package for the ruby development
environment, ruby-dev or ruby-devel for example.
MESSAGE
  end

  CONFTEST = "conftest".freeze
  CONFTEST_C = "#{CONFTEST}.c"

  OUTFLAG = CONFIG['OUTFLAG']
  COUTFLAG = CONFIG['COUTFLAG']
  CSRCFLAG = CONFIG['CSRCFLAG']
  CPPOUTFILE = config_string('CPPOUTFILE') {|str| str.sub(/\bconftest\b/, CONFTEST)}

  def rm_f(*files)
    opt = (Hash === files.last ? [files.pop] : [])
    FileUtils.rm_f(Dir[*files.flatten], *opt)
  end
  module_function :rm_f

  def rm_rf(*files)
    opt = (Hash === files.last ? [files.pop] : [])
    FileUtils.rm_rf(Dir[*files.flatten], *opt)
  end
  module_function :rm_rf

  # Returns time stamp of the +target+ file if it exists and is newer than or
  # equal to all of +times+.
  def modified?(target, times)
    (t = File.mtime(target)) rescue return nil
    Array === times or times = [times]
    t if times.all? {|n| n <= t}
  end

  def split_libs(*strs)
    sep = $mswin ? /\s+/ : /\s+(?=-|\z)/
    strs.flat_map {|s| s.lstrip.split(sep)}
  end

  def merge_libs(*libs)
    libs.inject([]) do |x, y|
      y = y.inject([]) {|ary, e| ary.last == e ? ary : ary << e}
      y.each_with_index do |v, yi|
        if xi = x.rindex(v)
          x[(xi+1)..-1] = merge_libs(y[(yi+1)..-1], x[(xi+1)..-1])
          x[xi, 0] = y[0...yi]
          break
        end
      end and x.concat(y)
      x
    end
  end

  # This is a custom logging module. It generates an mkmf.log file when you
  # run your extconf.rb script. This can be useful for debugging unexpected
  # failures.
  #
  # This module and its associated methods are meant for internal use only.
  #
  module Logging
    @log = nil
    @logfile = 'mkmf.log'
    @orgerr = $stderr.dup
    @orgout = $stdout.dup
    @postpone = 0
    @quiet = $extmk

    def self::log_open
      @log ||= File::open(@logfile, 'wb')
      @log.sync = true
    end

    def self::log_opened?
      @log and not @log.closed?
    end

    def self::open
      log_open
      $stderr.reopen(@log)
      $stdout.reopen(@log)
      yield
    ensure
      $stderr.reopen(@orgerr)
      $stdout.reopen(@orgout)
    end

    def self::message(*s)
      log_open
      @log.printf(*s)
    end

    def self::logfile file
      @logfile = file
      log_close
    end

    def self::log_close
      if @log and not @log.closed?
        @log.flush
        @log.close
        @log = nil
      end
    end

    def self::postpone
      tmplog = "mkmftmp#{@postpone += 1}.log"
      open do
        log, *save = @log, @logfile, @orgout, @orgerr
        @log, @logfile, @orgout, @orgerr = nil, tmplog, log, log
        begin
          log.print(open {yield @log})
        ensure
          @log.close if @log and not @log.closed?
          File::open(tmplog) {|t| FileUtils.copy_stream(t, log)} if File.exist?(tmplog)
          @log, @logfile, @orgout, @orgerr = log, *save
          @postpone -= 1
          MakeMakefile.rm_f tmplog
        end
      end
    end

    class << self
      attr_accessor :quiet
    end
  end

  def libpath_env
    # used only if native compiling
    if libpathenv = config_string("LIBPATHENV")
      pathenv = ENV[libpathenv]
      libpath = RbConfig.expand($DEFLIBPATH.join(File::PATH_SEPARATOR))
      {libpathenv => [libpath, pathenv].compact.join(File::PATH_SEPARATOR)}
    else
      {}
    end
  end

  def expand_command(commands, envs = libpath_env)
    varpat = /\$\((\w+)\)|\$\{(\w+)\}/
    vars = nil
    expand = proc do |command|
      case command
      when Array
        command.map(&expand)
      when String
        if varpat =~ command
          vars ||= Hash.new {|h, k| h[k] = ENV[k]}
          command = command.dup
          nil while command.gsub!(varpat) {vars[$1||$2]}
        end
        command
      else
        command
      end
    end
    if Array === commands
      env, *commands = commands if Hash === commands.first
      envs.merge!(env) if env
    end
    return envs, expand[commands]
  end

  def env_quote(envs)
    envs.map {|e, v| "#{e}=#{v.quote}"}
  end

  def xsystem command, opts = nil
    env, command = expand_command(command)
    Logging::open do
      puts [env_quote(env), command.quote].join(' ')
      if opts and opts[:werror]
        result = nil
        Logging.postpone do |log|
          output = IO.popen(env, command, &:read)
          result = ($?.success? and File.zero?(log.path))
          output
        end
        result
      else
        system(env, *command)
      end
    end
  end

  def xpopen command, *mode, &block
    env, commands = expand_command(command)
    command = [env_quote(env), command].join(' ')
    Logging::open do
      case mode[0]
      when nil, Hash, /^r/
        puts "#{command} |"
      else
        puts "| #{command}"
      end
      IO.popen(env, commands, *mode, &block)
    end
  end

  def log_src(src, heading="checked program was")
    src = src.split(/^/)
    fmt = "%#{src.size.to_s.size}d: %s"
    Logging::message <<"EOM"
#{heading}:
/* begin */
EOM
    src.each_with_index {|line, no| Logging::message fmt, no+1, line}
    Logging::message <<"EOM"
/* end */

EOM
  end

  def conftest_source
    CONFTEST_C
  end

  def create_tmpsrc(src)
    src = "#{COMMON_HEADERS}\n#{src}"
    src = yield(src) if block_given?
    src.gsub!(/[ \t]+$/, '')
    src.gsub!(/\A\n+|^\n+$/, '')
    src.sub!(/[^\n]\z/, "\\&\n")
    count = 0
    begin
      File.open(conftest_source, "wb") do |cfile|
        cfile.print src
      end
    rescue Errno::EACCES
      if (count += 1) < 5
        sleep 0.2
        retry
      end
    end
    src
  end

  def have_devel?
    unless defined? $have_devel
      $have_devel = true
      $have_devel = try_link(MAIN_DOES_NOTHING)
    end
    $have_devel
  end

  def try_do(src, command, *opts, &b)
    unless have_devel?
      raise <<MSG
The compiler failed to generate an executable file.
You have to install development tools first.
MSG
    end
    begin
      src = create_tmpsrc(src, &b)
      xsystem(command, *opts)
    ensure
      log_src(src)
    end
  end

  def link_config(ldflags, opt="", libpath=$DEFLIBPATH|$LIBPATH)
    librubyarg = $extmk ? $LIBRUBYARG_STATIC : "$(LIBRUBYARG)"
    conf = RbConfig::CONFIG.merge('hdrdir' => $hdrdir.quote,
                                  'src' => "#{conftest_source}",
                                  'arch_hdrdir' => $arch_hdrdir.quote,
                                  'top_srcdir' => $top_srcdir.quote,
                                  'INCFLAGS' => "#$INCFLAGS",
                                  'CPPFLAGS' => "#$CPPFLAGS",
                                  'CFLAGS' => "#$CFLAGS",
                                  'ARCH_FLAG' => "#$ARCH_FLAG",
                                  'LDFLAGS' => "#$LDFLAGS #{ldflags}",
                                  'LOCAL_LIBS' => "#$LOCAL_LIBS #$libs",
                                  'LIBS' => "#{librubyarg} #{opt} #$LIBS")
    conf['LIBPATH'] = libpathflag(libpath.map {|s| RbConfig::expand(s.dup, conf)})
    conf
  end

  def link_command(ldflags, *opts)
    conf = link_config(ldflags, *opts)
    RbConfig::expand(TRY_LINK.dup, conf)
  end

  def cc_config(opt="")
    conf = RbConfig::CONFIG.merge('hdrdir' => $hdrdir.quote, 'srcdir' => $srcdir.quote,
                                  'arch_hdrdir' => $arch_hdrdir.quote,
                                  'top_srcdir' => $top_srcdir.quote)
    conf
  end

  def cc_command(opt="")
    conf = cc_config(opt)
    RbConfig::expand("$(CC) #$INCFLAGS #$CPPFLAGS #$CFLAGS #$ARCH_FLAG #{opt} -c #{CONFTEST_C}",
                     conf)
  end

  def cpp_command(outfile, opt="")
    conf = cc_config(opt)
    if $universal and (arch_flag = conf['ARCH_FLAG']) and !arch_flag.empty?
      conf['ARCH_FLAG'] = arch_flag.gsub(/(?:\G|\s)-arch\s+\S+/, '')
    end
    RbConfig::expand("$(CPP) #$INCFLAGS #$CPPFLAGS #$CFLAGS #{opt} #{CONFTEST_C} #{outfile}",
                     conf)
  end

  def libpathflag(libpath=$DEFLIBPATH|$LIBPATH)
    libpath.map{|x|
      case x
      when "$(topdir)", /\A\./
        LIBPATHFLAG
      else
        LIBPATHFLAG+RPATHFLAG
      end % x.quote
    }.join
  end

  def with_werror(opt, opts = nil)
    if opts
      if opts[:werror] and config_string("WERRORFLAG") {|flag| opt = opt ? "#{opt} #{flag}" : flag}
        (opts = opts.dup).delete(:werror)
      end
      yield(opt, opts)
    else
      yield(opt)
    end
  end

  def try_link0(src, opt="", *opts, &b) # :nodoc:
    exe = CONFTEST+$EXEEXT
    cmd = link_command("", opt)
    if $universal
      require 'tmpdir'
      Dir.mktmpdir("mkmf_", oldtmpdir = ENV["TMPDIR"]) do |tmpdir|
        begin
          ENV["TMPDIR"] = tmpdir
          try_do(src, cmd, *opts, &b)
        ensure
          ENV["TMPDIR"] = oldtmpdir
        end
      end
    else
      try_do(src, cmd, *opts, &b)
    end and File.executable?(exe) or return nil
    exe
  ensure
    MakeMakefile.rm_rf(*Dir["#{CONFTEST}*"]-[exe])
  end

  # Returns whether or not the +src+ can be compiled as a C source and linked
  # with its depending libraries successfully.  +opt+ is passed to the linker
  # as options. Note that +$CFLAGS+ and +$LDFLAGS+ are also passed to the
  # linker.
  #
  # If a block given, it is called with the source before compilation. You can
  # modify the source in the block.
  #
  # [+src+] a String which contains a C source
  # [+opt+] a String which contains linker options
  def try_link(src, opt="", *opts, &b)
    exe = try_link0(src, opt, *opts, &b) or return false
    MakeMakefile.rm_f exe
    true
  end

  # Returns whether or not the +src+ can be compiled as a C source.  +opt+ is
  # passed to the C compiler as options. Note that +$CFLAGS+ is also passed to
  # the compiler.
  #
  # If a block given, it is called with the source before compilation. You can
  # modify the source in the block.
  #
  # [+src+] a String which contains a C source
  # [+opt+] a String which contains compiler options
  def try_compile(src, opt="", *opts, &b)
    with_werror(opt, *opts) {|_opt, *| try_do(src, cc_command(_opt), *opts, &b)} and
      File.file?("#{CONFTEST}.#{$OBJEXT}")
  ensure
    MakeMakefile.rm_f "#{CONFTEST}*"
  end

  # Returns whether or not the +src+ can be preprocessed with the C
  # preprocessor.  +opt+ is passed to the preprocessor as options. Note that
  # +$CFLAGS+ is also passed to the preprocessor.
  #
  # If a block given, it is called with the source before preprocessing. You
  # can modify the source in the block.
  #
  # [+src+] a String which contains a C source
  # [+opt+] a String which contains preprocessor options
  def try_cpp(src, opt="", *opts, &b)
    try_do(src, cpp_command(CPPOUTFILE, opt), *opts, &b) and
      File.file?("#{CONFTEST}.i")
  ensure
    MakeMakefile.rm_f "#{CONFTEST}*"
  end

  alias try_header try_compile

  def cpp_include(header)
    if header
      header = [header] unless header.kind_of? Array
      header.map {|h| String === h ? "#include <#{h}>\n" : h}.join
    else
      ""
    end
  end

  def with_cppflags(flags)
    cppflags = $CPPFLAGS
    $CPPFLAGS = flags.dup
    ret = yield
  ensure
    $CPPFLAGS = cppflags unless ret
  end

  def try_cppflags(flags, opts = {})
    try_header(MAIN_DOES_NOTHING, flags, {:werror => true}.update(opts))
  end

  def append_cppflags(flags, *opts)
    Array(flags).each do |flag|
      if checking_for("whether #{flag} is accepted as CPPFLAGS") {
           try_cppflags(flag, *opts)
         }
        $CPPFLAGS << " " << flag
      end
    end
  end

  def with_cflags(flags)
    cflags = $CFLAGS
    $CFLAGS = flags.dup
    ret = yield
  ensure
    $CFLAGS = cflags unless ret
  end

  def try_cflags(flags, opts = {})
    try_compile(MAIN_DOES_NOTHING, flags, {:werror => true}.update(opts))
  end

  def with_ldflags(flags)
    ldflags = $LDFLAGS
    $LDFLAGS = flags.dup
    ret = yield
  ensure
    $LDFLAGS = ldflags unless ret
  end

  def try_ldflags(flags, opts = {})
    opts = {:werror => true}.update(opts) if $mswin
    try_link(MAIN_DOES_NOTHING, flags, opts)
  end

  def append_ldflags(flags, *opts)
    Array(flags).each do |flag|
      if checking_for("whether #{flag} is accepted as LDFLAGS") {
           try_ldflags(flag, *opts)
         }
        $LDFLAGS << " " << flag
      end
    end
  end

  def try_static_assert(expr, headers = nil, opt = "", &b)
    headers = cpp_include(headers)
    try_compile(<<SRC, opt, &b)
#{headers}
/*top*/
int conftest_const[(#{expr}) ? 1 : -1];
SRC
  end

  def try_constant(const, headers = nil, opt = "", &b)
    includes = cpp_include(headers)
    neg = try_static_assert("#{const} < 0", headers, opt)
    if CROSS_COMPILING
      if neg
        const = "-(#{const})"
      elsif try_static_assert("#{const} > 0", headers, opt)
        # positive constant
      elsif try_static_assert("#{const} == 0", headers, opt)
        return 0
      else
        # not a constant
        return nil
      end
      upper = 1
      until try_static_assert("#{const} <= #{upper}", headers, opt)
        lower = upper
        upper <<= 1
      end
      return nil unless lower
      while upper > lower + 1
        mid = (upper + lower) / 2
        if try_static_assert("#{const} > #{mid}", headers, opt)
          lower = mid
        else
          upper = mid
        end
      end
      upper = -upper if neg
      return upper
    else
      src = %{#{includes}
#include <stdio.h>
/*top*/
typedef#{neg ? '' : ' unsigned'}
#ifdef PRI_LL_PREFIX
#define PRI_CONFTEST_PREFIX PRI_LL_PREFIX
LONG_LONG
#else
#define PRI_CONFTEST_PREFIX "l"
long
#endif
conftest_type;
conftest_type conftest_const = (conftest_type)(#{const});
int main() {printf("%"PRI_CONFTEST_PREFIX"#{neg ? 'd' : 'u'}\\n", conftest_const); return 0;}
}
      begin
        if try_link0(src, opt, &b)
          xpopen("./#{CONFTEST}") do |f|
            return Integer(f.gets)
          end
        end
      ensure
        MakeMakefile.rm_f "#{CONFTEST}#{$EXEEXT}"
      end
    end
    nil
  end

  # You should use +have_func+ rather than +try_func+.
  #
  # [+func+] a String which contains a symbol name
  # [+libs+] a String which contains library names.
  # [+headers+] a String or an Array of strings which contains names of header
  #             files.
  def try_func(func, libs, headers = nil, opt = "", &b)
    headers = cpp_include(headers)
    prepare = String.new
    case func
    when /^&/
      decltype = proc {|x|"const volatile void *#{x}"}
    when /\)$/
      strvars = []
      call = func.gsub(/""/) {
        v = "s#{strvars.size + 1}"
        strvars << v
        v
      }
      unless strvars.empty?
        prepare << "char " << strvars.map {|v| "#{v}[1024]"}.join(", ") << "; "
      end
    when nil
      call = ""
    else
      call = "#{func}()"
      decltype = proc {|x| "void ((*#{x})())"}
    end
    if opt and !opt.empty?
      [[:to_str], [:join, " "], [:to_s]].each do |meth, *args|
        if opt.respond_to?(meth)
          break opt = opt.__send__(meth, *args)
        end
      end
      opt = "#{opt} #{libs}"
    else
      opt = libs
    end
    decltype && try_link(<<"SRC", opt, &b) or
#{headers}
/*top*/
extern int t(void);
#{MAIN_DOES_NOTHING 't'}
int t(void) { #{decltype["volatile p"]}; p = (#{decltype[]})#{func}; return !p; }
SRC
    call && try_link(<<"SRC", opt, &b)
#{headers}
/*top*/
extern int t(void);
#{MAIN_DOES_NOTHING 't'}
#{"extern void #{call};" if decltype}
int t(void) { #{prepare}#{call}; return 0; }
SRC
  end

  # You should use +have_var+ rather than +try_var+.
  def try_var(var, headers = nil, opt = "", &b)
    headers = cpp_include(headers)
    try_compile(<<"SRC", opt, &b)
#{headers}
/*top*/
extern int t(void);
#{MAIN_DOES_NOTHING 't'}
int t(void) { const volatile void *volatile p; p = &(&#{var})[0]; return !p; }
SRC
  end

  # Returns whether or not the +src+ can be preprocessed with the C
  # preprocessor and matches with +pat+.
  #
  # If a block given, it is called with the source before compilation. You can
  # modify the source in the block.
  #
  # [+pat+] a Regexp or a String
  # [+src+] a String which contains a C source
  # [+opt+] a String which contains preprocessor options
  #
  # NOTE: When pat is a Regexp the matching will be checked in process,
  # otherwise egrep(1) will be invoked to check it.
  def egrep_cpp(pat, src, opt = "", &b)
    src = create_tmpsrc(src, &b)
    xpopen(cpp_command('', opt)) do |f|
      if Regexp === pat
        puts("    ruby -ne 'print if #{pat.inspect}'")
        f.grep(pat) {|l|
          puts "#{f.lineno}: #{l}"
          return true
        }
        false
      else
        puts("    egrep '#{pat}'")
        begin
          stdin = $stdin.dup
          $stdin.reopen(f)
          system("egrep", pat)
        ensure
          $stdin.reopen(stdin)
        end
      end
    end
  ensure
    MakeMakefile.rm_f "#{CONFTEST}*"
    log_src(src)
  end

  # This is used internally by the have_macro? method.
  def macro_defined?(macro, src, opt = "", &b)
    src = src.sub(/[^\n]\z/, "\\&\n")
    try_compile(src + <<"SRC", opt, &b)
/*top*/
#ifndef #{macro}
# error
|:/ === #{macro} undefined === /:|
#endif
SRC
  end

  # Returns whether or not:
  # * the +src+ can be compiled as a C source,
  # * the result object can be linked with its depending libraries
  #   successfully,
  # * the linked file can be invoked as an executable
  # * and the executable exits successfully
  #
  # +opt+ is passed to the linker as options. Note that +$CFLAGS+ and
  # +$LDFLAGS+ are also passed to the linker.
  #
  # If a block given, it is called with the source before compilation. You can
  # modify the source in the block.
  #
  # [+src+] a String which contains a C source
  # [+opt+] a String which contains linker options
  #
  # Returns true when the executable exits successfully, false when it fails,
  # or nil when preprocessing, compilation or link fails.
  def try_run(src, opt = "", &b)
    raise "cannot run test program while cross compiling" if CROSS_COMPILING
    if try_link0(src, opt, &b)
      xsystem("./#{CONFTEST}")
    else
      nil
    end
  ensure
    MakeMakefile.rm_f "#{CONFTEST}*"
  end

  def install_files(mfile, ifiles, map = nil, srcprefix = nil)
    ifiles or return
    ifiles.empty? and return
    srcprefix ||= "$(srcdir)/#{srcprefix}".chomp('/')
    RbConfig::expand(srcdir = srcprefix.dup)
    dirs = []
    path = Hash.new {|h, i| h[i] = dirs.push([i])[-1]}
    ifiles.each do |files, dir, prefix|
      dir = map_dir(dir, map)
      prefix &&= %r|\A#{Regexp.quote(prefix)}/?|
      if /\A\.\// =~ files
        # install files which are in current working directory.
        files = files[2..-1]
        len = nil
      else
        # install files which are under the $(srcdir).
        files = File.join(srcdir, files)
        len = srcdir.size
      end
      f = nil
      Dir.glob(files) do |fx|
        f = fx
        f[0..len] = "" if len
        case File.basename(f)
        when *$NONINSTALLFILES
          next
        end
        d = File.dirname(f)
        d.sub!(prefix, "") if prefix
        d = (d.empty? || d == ".") ? dir : File.join(dir, d)
        f = File.join(srcprefix, f) if len
        path[d] << f
      end
      unless len or f
        d = File.dirname(files)
        d.sub!(prefix, "") if prefix
        d = (d.empty? || d == ".") ? dir : File.join(dir, d)
        path[d] << files
      end
    end
    dirs
  end

  def install_rb(mfile, dest, srcdir = nil)
    install_files(mfile, [["lib/**/*.rb", dest, "lib"]], nil, srcdir)
  end

  def append_library(libs, lib) # :no-doc:
    format(LIBARG, lib) + " " + libs
  end

  def message(*s)
    unless Logging.quiet and not $VERBOSE
      printf(*s)
      $stdout.flush
    end
  end

  # This emits a string to stdout that allows users to see the results of the
  # various have* and find* methods as they are tested.
  #
  # Internal use only.
  #
  def checking_for(m, fmt = nil)
    if f = caller_locations(1, 1).first.base_label and /\A\w/ =~ f
      f += ": "
    else
      f = ""
    end
    m = "checking #{/\Acheck/ =~ f ? '' : 'for '}#{m}... "
    message "%s", m
    a = r = nil
    Logging::postpone do
      r = yield
      a = (fmt ? "#{fmt % r}" : r ? "yes" : "no")
      "#{f}#{m}-------------------- #{a}\n\n"
    end
    message "%s\n", a
    Logging::message "--------------------\n\n"
    r
  end

  def checking_message(target, place = nil, opt = nil)
    [["in", place], ["with", opt]].inject("#{target}") do |msg, (pre, noun)|
      if noun
        [[:to_str], [:join, ","], [:to_s]].each do |meth, *args|
          if noun.respond_to?(meth)
            break noun = noun.__send__(meth, *args)
          end
        end
        unless noun.empty?
          msg << " #{pre} " unless msg.empty?
          msg << noun
        end
      end
      msg
    end
  end

  # :startdoc:

  # Check whether each given C compiler flag is acceptable and append it
  # to <tt>$CFLAGS</tt> if so.
  #
  # [+flags+] a C compiler flag as a +String+ or an +Array+ of them
  #
  def append_cflags(flags, *opts)
    Array(flags).each do |flag|
      if checking_for("whether #{flag} is accepted as CFLAGS") {
           try_cflags(flag, *opts)
         }
        $CFLAGS << " " << flag
      end
    end
  end

  # Returns whether or not +macro+ is defined either in the common header
  # files or within any +headers+ you provide.
  #
  # Any options you pass to +opt+ are passed along to the compiler.
  #
  def have_macro(macro, headers = nil, opt = "", &b)
    checking_for checking_message(macro, headers, opt) do
      macro_defined?(macro, cpp_include(headers), opt, &b)
    end
  end

  # Returns whether or not the given entry point +func+ can be found within
  # +lib+.  If +func+ is +nil+, the <code>main()</code> entry point is used by
  # default.  If found, it adds the library to list of libraries to be used
  # when linking your extension.
  #
  # If +headers+ are provided, it will include those header files as the
  # header files it looks in when searching for +func+.
  #
  # The real name of the library to be linked can be altered by
  # <code>--with-FOOlib</code> configuration option.
  #
  def have_library(lib, func = nil, headers = nil, opt = "", &b)
    dir_config(lib)
    lib = with_config(lib+'lib', lib)
    checking_for checking_message(func && func.funcall_style, LIBARG%lib, opt) do
      if COMMON_LIBS.include?(lib)
        true
      else
        libs = append_library($libs, lib)
        if try_func(func, libs, headers, opt, &b)
          $libs = libs
          true
        else
          false
        end
      end
    end
  end

  # Returns whether or not the entry point +func+ can be found within the
  # library +lib+ in one of the +paths+ specified, where +paths+ is an array
  # of strings.  If +func+ is +nil+ , then the <code>main()</code> function is
  # used as the entry point.
  #
  # If +lib+ is found, then the path it was found on is added to the list of
  # library paths searched and linked against.
  #
  def find_library(lib, func, *paths, &b)
    dir_config(lib)
    lib = with_config(lib+'lib', lib)
    paths = paths.flat_map {|path| path.split(File::PATH_SEPARATOR)}
    checking_for checking_message(func && func.funcall_style, LIBARG%lib) do
      libpath = $LIBPATH
      libs = append_library($libs, lib)
      begin
        until r = try_func(func, libs, &b) or paths.empty?
          $LIBPATH = libpath | [paths.shift]
        end
        if r
          $libs = libs
          libpath = nil
        end
      ensure
        $LIBPATH = libpath if libpath
      end
      r
    end
  end

  # Returns whether or not the function +func+ can be found in the common
  # header files, or within any +headers+ that you provide.  If found, a macro
  # is passed as a preprocessor constant to the compiler using the function
  # name, in uppercase, prepended with +HAVE_+.
  #
  # To check functions in an additional library, you need to check that
  # library first using <code>have_library()</code>.  The +func+ shall be
  # either mere function name or function name with arguments.
  #
  # For example, if <code>have_func('foo')</code> returned +true+, then the
  # +HAVE_FOO+ preprocessor macro would be passed to the compiler.
  #
  def have_func(func, headers = nil, opt = "", &b)
    checking_for checking_message(func.funcall_style, headers, opt) do
      if try_func(func, $libs, headers, opt, &b)
        $defs << "-DHAVE_#{func.sans_arguments.tr_cpp}"
        true
      else
        false
      end
    end
  end

  # Returns whether or not the variable +var+ can be found in the common
  # header files, or within any +headers+ that you provide.  If found, a macro
  # is passed as a preprocessor constant to the compiler using the variable
  # name, in uppercase, prepended with +HAVE_+.
  #
  # To check variables in an additional library, you need to check that
  # library first using <code>have_library()</code>.
  #
  # For example, if <code>have_var('foo')</code> returned true, then the
  # +HAVE_FOO+ preprocessor macro would be passed to the compiler.
  #
  def have_var(var, headers = nil, opt = "", &b)
    checking_for checking_message(var, headers, opt) do
      if try_var(var, headers, opt, &b)
        $defs.push(format("-DHAVE_%s", var.tr_cpp))
        true
      else
        false
      end
    end
  end

  # Returns whether or not the given +header+ file can be found on your system.
  # If found, a macro is passed as a preprocessor constant to the compiler
  # using the header file name, in uppercase, prepended with +HAVE_+.
  #
  # For example, if <code>have_header('foo.h')</code> returned true, then the
  # +HAVE_FOO_H+ preprocessor macro would be passed to the compiler.
  #
  def have_header(header, preheaders = nil, opt = "", &b)
    dir_config(header[/.*?(?=\/)|.*?(?=\.)/])
    checking_for header do
      if try_header(cpp_include(preheaders)+cpp_include(header), opt, &b)
        $defs.push(format("-DHAVE_%s", header.tr_cpp))
        true
      else
        false
      end
    end
  end

  # Returns whether or not the given +framework+ can be found on your system.
  # If found, a macro is passed as a preprocessor constant to the compiler
  # using the framework name, in uppercase, prepended with +HAVE_FRAMEWORK_+.
  #
  # For example, if <code>have_framework('Ruby')</code> returned true, then
  # the +HAVE_FRAMEWORK_RUBY+ preprocessor macro would be passed to the
  # compiler.
  #
  # If +fw+ is a pair of the framework name and its header file name
  # that header file is checked, instead of the normally used header
  # file which is named same as the framework.
  def have_framework(fw, &b)
    if Array === fw
      fw, header = *fw
    else
      header = "#{fw}.h"
    end
    checking_for fw do
      src = cpp_include("#{fw}/#{header}") << "\n" "int main(void){return 0;}"
      opt = " -framework #{fw}"
      if try_link(src, opt, &b) or (objc = try_link(src, "-ObjC#{opt}", &b))
        $defs.push(format("-DHAVE_FRAMEWORK_%s", fw.tr_cpp))
        # TODO: non-worse way than this hack, to get rid of separating
        # option and its argument.
        $LDFLAGS << " -ObjC" if objc and /(\A|\s)-ObjC(\s|\z)/ !~ $LDFLAGS
        $LIBS << opt
        true
      else
        false
      end
    end
  end

  # Instructs mkmf to search for the given +header+ in any of the +paths+
  # provided, and returns whether or not it was found in those paths.
  #
  # If the header is found then the path it was found on is added to the list
  # of included directories that are sent to the compiler (via the
  # <code>-I</code> switch).
  #
  def find_header(header, *paths)
    message = checking_message(header, paths)
    header = cpp_include(header)
    checking_for message do
      if try_header(header)
        true
      else
        found = false
        paths.each do |dir|
          opt = "-I#{dir}".quote
          if try_header(header, opt)
            $INCFLAGS << " " << opt
            found = true
            break
          end
        end
        found
      end
    end
  end

  # Returns whether or not the struct of type +type+ contains +member+.  If
  # it does not, or the struct type can't be found, then false is returned.
  # You may optionally specify additional +headers+ in which to look for the
  # struct (in addition to the common header files).
  #
  # If found, a macro is passed as a preprocessor constant to the compiler
  # using the type name and the member name, in uppercase, prepended with
  # +HAVE_+.
  #
  # For example, if <code>have_struct_member('struct foo', 'bar')</code>
  # returned true, then the +HAVE_STRUCT_FOO_BAR+ preprocessor macro would be
  # passed to the compiler.
  #
  # +HAVE_ST_BAR+ is also defined for backward compatibility.
  #
  def have_struct_member(type, member, headers = nil, opt = "", &b)
    checking_for checking_message("#{type}.#{member}", headers) do
      if try_compile(<<"SRC", opt, &b)
#{cpp_include(headers)}
/*top*/
int s = (char *)&((#{type}*)0)->#{member} - (char *)0;
#{MAIN_DOES_NOTHING}
SRC
        $defs.push(format("-DHAVE_%s_%s", type.tr_cpp, member.tr_cpp))
        $defs.push(format("-DHAVE_ST_%s", member.tr_cpp)) # backward compatibility
        true
      else
        false
      end
    end
  end

  # Returns whether or not the static type +type+ is defined.
  #
  # See also +have_type+
  #
  def try_type(type, headers = nil, opt = "", &b)
    if try_compile(<<"SRC", opt, &b)
#{cpp_include(headers)}
/*top*/
typedef #{type} conftest_type;
int conftestval[sizeof(conftest_type)?1:-1];
SRC
      $defs.push(format("-DHAVE_TYPE_%s", type.tr_cpp))
      true
    else
      false
    end
  end

  # Returns whether or not the static type +type+ is defined.  You may
  # optionally pass additional +headers+ to check against in addition to the
  # common header files.
  #
  # You may also pass additional flags to +opt+ which are then passed along to
  # the compiler.
  #
  # If found, a macro is passed as a preprocessor constant to the compiler
  # using the type name, in uppercase, prepended with +HAVE_TYPE_+.
  #
  # For example, if <code>have_type('foo')</code> returned true, then the
  # +HAVE_TYPE_FOO+ preprocessor macro would be passed to the compiler.
  #
  def have_type(type, headers = nil, opt = "", &b)
    checking_for checking_message(type, headers, opt) do
      try_type(type, headers, opt, &b)
    end
  end

  # Returns where the static type +type+ is defined.
  #
  # You may also pass additional flags to +opt+ which are then passed along to
  # the compiler.
  #
  # See also +have_type+.
  #
  def find_type(type, opt, *headers, &b)
    opt ||= ""
    fmt = "not found"
    def fmt.%(x)
      x ? x.respond_to?(:join) ? x.join(",") : x : self
    end
    checking_for checking_message(type, nil, opt), fmt do
      headers.find do |h|
        try_type(type, h, opt, &b)
      end
    end
  end

  # Returns whether or not the constant +const+ is defined.
  #
  # See also +have_const+
  #
  def try_const(const, headers = nil, opt = "", &b)
    const, type = *const
    if try_compile(<<"SRC", opt, &b)
#{cpp_include(headers)}
/*top*/
typedef #{type || 'int'} conftest_type;
conftest_type conftestval = #{type ? '' : '(int)'}#{const};
SRC
      $defs.push(format("-DHAVE_CONST_%s", const.tr_cpp))
      true
    else
      false
    end
  end

  # Returns whether or not the constant +const+ is defined.  You may
  # optionally pass the +type+ of +const+ as <code>[const, type]</code>,
  # such as:
  #
  #   have_const(%w[PTHREAD_MUTEX_INITIALIZER pthread_mutex_t], "pthread.h")
  #
  # You may also pass additional +headers+ to check against in addition to the
  # common header files, and additional flags to +opt+ which are then passed
  # along to the compiler.
  #
  # If found, a macro is passed as a preprocessor constant to the compiler
  # using the type name, in uppercase, prepended with +HAVE_CONST_+.
  #
  # For example, if <code>have_const('foo')</code> returned true, then the
  # +HAVE_CONST_FOO+ preprocessor macro would be passed to the compiler.
  #
  def have_const(const, headers = nil, opt = "", &b)
    checking_for checking_message([*const].compact.join(' '), headers, opt) do
      try_const(const, headers, opt, &b)
    end
  end

  # :stopdoc:
  STRING_OR_FAILED_FORMAT = "%s"
  class << STRING_OR_FAILED_FORMAT # :nodoc:
    def %(x)
      x ? super : "failed"
    end
  end

  def typedef_expr(type, headers)
    typename, member = type.split('.', 2)
    prelude = cpp_include(headers).split(/$/)
    prelude << "typedef #{typename} rbcv_typedef_;\n"
    return "rbcv_typedef_", member, prelude
  end

  def try_signedness(type, member, headers = nil, opts = nil)
    raise ArgumentError, "don't know how to tell signedness of members" if member
    if try_static_assert("(#{type})-1 < 0", headers, opts)
      return -1
    elsif try_static_assert("(#{type})-1 > 0", headers, opts)
      return +1
    end
  end

  # :startdoc:

  # Returns the size of the given +type+.  You may optionally specify
  # additional +headers+ to search in for the +type+.
  #
  # If found, a macro is passed as a preprocessor constant to the compiler
  # using the type name, in uppercase, prepended with +SIZEOF_+, followed by
  # the type name, followed by <code>=X</code> where "X" is the actual size.
  #
  # For example, if <code>check_sizeof('mystruct')</code> returned 12, then
  # the <code>SIZEOF_MYSTRUCT=12</code> preprocessor macro would be passed to
  # the compiler.
  #
  def check_sizeof(type, headers = nil, opts = "", &b)
    typedef, member, prelude = typedef_expr(type, headers)
    prelude << "#{typedef} *rbcv_ptr_;\n"
    prelude = [prelude]
    expr = "sizeof((*rbcv_ptr_)#{"." << member if member})"
    fmt = STRING_OR_FAILED_FORMAT
    checking_for checking_message("size of #{type}", headers), fmt do
      if size = try_constant(expr, prelude, opts, &b)
        $defs.push(format("-DSIZEOF_%s=%s", type.tr_cpp, size))
        size
      end
    end
  end

  # Returns the signedness of the given +type+.  You may optionally specify
  # additional +headers+ to search in for the +type+.
  #
  # If the +type+ is found and is a numeric type, a macro is passed as a
  # preprocessor constant to the compiler using the +type+ name, in uppercase,
  # prepended with +SIGNEDNESS_OF_+, followed by the +type+ name, followed by
  # <code>=X</code> where "X" is positive integer if the +type+ is unsigned
  # and a negative integer if the +type+ is signed.
  #
  # For example, if +size_t+ is defined as unsigned, then
  # <code>check_signedness('size_t')</code> would return +1 and the
  # <code>SIGNEDNESS_OF_SIZE_T=+1</code> preprocessor macro would be passed to
  # the compiler.  The <code>SIGNEDNESS_OF_INT=-1</code> macro would be set
  # for <code>check_signedness('int')</code>
  #
  def check_signedness(type, headers = nil, opts = nil, &b)
    typedef, member, prelude = typedef_expr(type, headers)
    signed = nil
    checking_for("signedness of #{type}", STRING_OR_FAILED_FORMAT) do
      signed = try_signedness(typedef, member, [prelude], opts, &b) or next nil
      $defs.push("-DSIGNEDNESS_OF_%s=%+d" % [type.tr_cpp, signed])
      signed < 0 ? "signed" : "unsigned"
    end
    signed
  end

  # Returns the convertible integer type of the given +type+.  You may
  # optionally specify additional +headers+ to search in for the +type+.
  # _convertible_ means actually the same type, or typedef'd from the same
  # type.
  #
  # If the +type+ is an integer type and the _convertible_ type is found,
  # the following macros are passed as preprocessor constants to the compiler
  # using the +type+ name, in uppercase.
  #
  # * +TYPEOF_+, followed by the +type+ name, followed by <code>=X</code>
  #   where "X" is the found _convertible_ type name.
  # * +TYP2NUM+ and +NUM2TYP+,
  #   where +TYP+ is the +type+ name in uppercase with replacing an +_t+
  #   suffix with "T", followed by <code>=X</code> where "X" is the macro name
  #   to convert +type+ to an Integer object, and vice versa.
  #
  # For example, if +foobar_t+ is defined as unsigned long, then
  # <code>convertible_int("foobar_t")</code> would return "unsigned long", and
  # define these macros:
  #
  #   #define TYPEOF_FOOBAR_T unsigned long
  #   #define FOOBART2NUM ULONG2NUM
  #   #define NUM2FOOBART NUM2ULONG
  #
  def convertible_int(type, headers = nil, opts = nil, &b)
    type, macname = *type
    checking_for("convertible type of #{type}", STRING_OR_FAILED_FORMAT) do
      if UNIVERSAL_INTS.include?(type)
        type
      else
        typedef, member, prelude = typedef_expr(type, headers, &b)
        if member
          prelude << "static rbcv_typedef_ rbcv_var;"
          compat = UNIVERSAL_INTS.find {|t|
            try_static_assert("sizeof(rbcv_var.#{member}) == sizeof(#{t})", [prelude], opts, &b)
          }
        else
          next unless signed = try_signedness(typedef, member, [prelude])
          u = "unsigned " if signed > 0
          prelude << "extern rbcv_typedef_ foo();"
          compat = UNIVERSAL_INTS.find {|t|
            try_compile([prelude, "extern #{u}#{t} foo();"].join("\n"), opts, :werror=>true, &b)
          }
        end
        if compat
          macname ||= type.sub(/_(?=t\z)/, '').tr_cpp
          conv = (compat == "long long" ? "LL" : compat.upcase)
          compat = "#{u}#{compat}"
          typename = type.tr_cpp
          $defs.push(format("-DSIZEOF_%s=SIZEOF_%s", typename, compat.tr_cpp))
          $defs.push(format("-DTYPEOF_%s=%s", typename, compat.quote))
          $defs.push(format("-DPRI_%s_PREFIX=PRI_%s_PREFIX", macname, conv))
          conv = (u ? "U" : "") + conv
          $defs.push(format("-D%s2NUM=%s2NUM", macname, conv))
          $defs.push(format("-DNUM2%s=NUM2%s", macname, conv))
          compat
        end
      end
    end
  end
  # :stopdoc:

  # Used internally by the what_type? method to determine if +type+ is a scalar
  # pointer.
  def scalar_ptr_type?(type, member = nil, headers = nil, &b)
    try_compile(<<"SRC", &b)   # pointer
#{cpp_include(headers)}
/*top*/
volatile #{type} conftestval;
extern int t(void);
#{MAIN_DOES_NOTHING 't'}
int t(void) {return (int)(1-*(conftestval#{member ? ".#{member}" : ""}));}
SRC
  end

  # Used internally by the what_type? method to determine if +type+ is a scalar
  # pointer.
  def scalar_type?(type, member = nil, headers = nil, &b)
    try_compile(<<"SRC", &b)   # pointer
#{cpp_include(headers)}
/*top*/
volatile #{type} conftestval;
extern int t(void);
#{MAIN_DOES_NOTHING 't'}
int t(void) {return (int)(1-(conftestval#{member ? ".#{member}" : ""}));}
SRC
  end

  # Used internally by the what_type? method to check if the _typeof_ GCC
  # extension is available.
  def have_typeof?
    return $typeof if defined?($typeof)
    $typeof = %w[__typeof__ typeof].find do |t|
      try_compile(<<SRC)
int rbcv_foo;
#{t}(rbcv_foo) rbcv_bar;
SRC
    end
  end

  def what_type?(type, member = nil, headers = nil, &b)
    m = "#{type}"
    var = val = "*rbcv_var_"
    func = "rbcv_func_(void)"
    if member
      m << "." << member
    else
      type, member = type.split('.', 2)
    end
    if member
      val = "(#{var}).#{member}"
    end
    prelude = [cpp_include(headers).split(/^/)]
    prelude << ["typedef #{type} rbcv_typedef_;\n",
                "extern rbcv_typedef_ *#{func};\n",
                "rbcv_typedef_ #{var};\n",
               ]
    type = "rbcv_typedef_"
    fmt = member && !(typeof = have_typeof?) ? "seems %s" : "%s"
    if typeof
      var = "*rbcv_member_"
      func = "rbcv_mem_func_(void)"
      member = nil
      type = "rbcv_mem_typedef_"
      prelude[-1] << "typedef #{typeof}(#{val}) #{type};\n"
      prelude[-1] << "extern #{type} *#{func};\n"
      prelude[-1] << "#{type} #{var};\n"
      val = var
    end
    def fmt.%(x)
      x ? super : "unknown"
    end
    checking_for checking_message(m, headers), fmt do
      if scalar_ptr_type?(type, member, prelude, &b)
        if try_static_assert("sizeof(*#{var}) == 1", prelude)
          return "string"
        end
        ptr = "*"
      elsif scalar_type?(type, member, prelude, &b)
        unless member and !typeof or try_static_assert("(#{type})-1 < 0", prelude)
          unsigned = "unsigned"
        end
        ptr = ""
      else
        next
      end
      type = UNIVERSAL_INTS.find do |t|
        pre = prelude
        unless member
          pre += [["#{unsigned} #{t} #{ptr}#{var};\n",
                   "extern #{unsigned} #{t} #{ptr}*#{func};\n"]]
        end
        try_static_assert("sizeof(#{ptr}#{val}) == sizeof(#{unsigned} #{t})", pre)
      end
      type or next
      [unsigned, type, ptr].join(" ").strip
    end
  end

  # This method is used internally by the find_executable method.
  #
  # Internal use only.
  #
  def find_executable0(bin, path = nil)
    executable_file = proc do |name|
      begin
        stat = File.stat(name)
      rescue SystemCallError
      else
        next name if stat.file? and stat.executable?
      end
    end

    exts = config_string('EXECUTABLE_EXTS') {|s| s.split} || config_string('EXEEXT') {|s| [s]}
    if File.expand_path(bin) == bin
      return bin if executable_file.call(bin)
      if exts
        exts.each {|ext| executable_file.call(file = bin + ext) and return file}
      end
      return nil
    end
    if path ||= ENV['PATH']
      path = path.split(File::PATH_SEPARATOR)
    else
      path = %w[/usr/local/bin /usr/ucb /usr/bin /bin]
    end
    file = nil
    path.each do |dir|
      dir.sub!(/\A"(.*)"\z/m, '\1') if $mswin or $mingw
      return file if executable_file.call(file = File.join(dir, bin))
      if exts
        exts.each {|ext| executable_file.call(ext = file + ext) and return ext}
      end
    end
    nil
  end

  # :startdoc:

  # Searches for the executable +bin+ on +path+.  The default path is your
  # +PATH+ environment variable. If that isn't defined, it will resort to
  # searching /usr/local/bin, /usr/ucb, /usr/bin and /bin.
  #
  # If found, it will return the full path, including the executable name, of
  # where it was found.
  #
  # Note that this method does not actually affect the generated Makefile.
  #
  def find_executable(bin, path = nil)
    checking_for checking_message(bin, path) do
      find_executable0(bin, path)
    end
  end

  # :stopdoc:

  def arg_config(config, default=nil, &block)
    $arg_config << [config, default]
    defaults = []
    if default
      defaults << default
    elsif !block
      defaults << nil
    end
    $configure_args.fetch(config.tr('_', '-'), *defaults, &block)
  end

  # :startdoc:

  # Tests for the presence of a <tt>--with-</tt>_config_ or
  # <tt>--without-</tt>_config_ option.  Returns +true+ if the with option is
  # given, +false+ if the without option is given, and the default value
  # otherwise.
  #
  # This can be useful for adding custom definitions, such as debug
  # information.
  #
  # Example:
  #
  #    if with_config("debug")
  #       $defs.push("-DOSSL_DEBUG") unless $defs.include? "-DOSSL_DEBUG"
  #    end
  #
  def with_config(config, default=nil)
    config = config.sub(/^--with[-_]/, '')
    val = arg_config("--with-"+config) do
      if arg_config("--without-"+config)
        false
      elsif block_given?
        yield(config, default)
      else
        break default
      end
    end
    case val
    when "yes"
      true
    when "no"
      false
    else
      val
    end
  end

  # Tests for the presence of an <tt>--enable-</tt>_config_ or
  # <tt>--disable-</tt>_config_ option. Returns +true+ if the enable option is
  # given, +false+ if the disable option is given, and the default value
  # otherwise.
  #
  # This can be useful for adding custom definitions, such as debug
  # information.
  #
  # Example:
  #
  #    if enable_config("debug")
  #       $defs.push("-DOSSL_DEBUG") unless $defs.include? "-DOSSL_DEBUG"
  #    end
  #
  def enable_config(config, default=nil)
    if arg_config("--enable-"+config)
      true
    elsif arg_config("--disable-"+config)
      false
    elsif block_given?
      yield(config, default)
    else
      return default
    end
  end

  # Generates a header file consisting of the various macro definitions
  # generated by other methods such as have_func and have_header. These are
  # then wrapped in a custom <code>#ifndef</code> based on the +header+ file
  # name, which defaults to "extconf.h".
  #
  # For example:
  #
  #   # extconf.rb
  #   require 'mkmf'
  #   have_func('realpath')
  #   have_header('sys/utime.h')
  #   create_header
  #   create_makefile('foo')
  #
  # The above script would generate the following extconf.h file:
  #
  #   #ifndef EXTCONF_H
  #   #define EXTCONF_H
  #   #define HAVE_REALPATH 1
  #   #define HAVE_SYS_UTIME_H 1
  #   #endif
  #
  # Given that the create_header method generates a file based on definitions
  # set earlier in your extconf.rb file, you will probably want to make this
  # one of the last methods you call in your script.
  #
  def create_header(header = "extconf.h")
    message "creating %s\n", header
    sym = header.tr_cpp
    hdr = ["#ifndef #{sym}\n#define #{sym}\n"]
    for line in $defs
      case line
      when /^-D([^=]+)(?:=(.*))?/
        hdr << "#define #$1 #{$2 ? Shellwords.shellwords($2)[0].gsub(/(?=\t+)/, "\\\n") : 1}\n"
      when /^-U(.*)/
        hdr << "#undef #$1\n"
      end
    end
    hdr << "#endif\n"
    hdr = hdr.join("")
    log_src(hdr, "#{header} is")
    unless (File.read(header) == hdr rescue false)
      File.open(header, "wb") do |hfile|
        hfile.write(hdr)
      end
    end
    $extconf_h = header
  end

  # call-seq:
  #   dir_config(target)
  #   dir_config(target, prefix)
  #   dir_config(target, idefault, ldefault)
  #
  # Sets a +target+ name that the user can then use to configure
  # various "with" options with on the command line by using that
  # name.  For example, if the target is set to "foo", then the user
  # could use the <code>--with-foo-dir=prefix</code>,
  # <code>--with-foo-include=dir</code> and
  # <code>--with-foo-lib=dir</code> command line options to tell where
  # to search for header/library files.
  #
  # You may pass along additional parameters to specify default
  # values.  If one is given it is taken as default +prefix+, and if
  # two are given they are taken as "include" and "lib" defaults in
  # that order.
  #
  # In any case, the return value will be an array of determined
  # "include" and "lib" directories, either of which can be nil if no
  # corresponding command line option is given when no default value
  # is specified.
  #
  # Note that dir_config only adds to the list of places to search for
  # libraries and include files.  It does not link the libraries into your
  # application.
  #
  def dir_config(target, idefault=nil, ldefault=nil)
    key = [target, idefault, ldefault].compact.join("\0")
    if conf = $config_dirs[key]
      return conf
    end

    if dir = with_config(target + "-dir", (idefault unless ldefault))
      defaults = Array === dir ? dir : dir.split(File::PATH_SEPARATOR)
      idefault = ldefault = nil
    end

    idir = with_config(target + "-include", idefault)
    if conf = $arg_config.assoc("--with-#{target}-include")
      conf[1] ||= "${#{target}-dir}/include"
    end
    ldir = with_config(target + "-lib", ldefault)
    if conf = $arg_config.assoc("--with-#{target}-lib")
      conf[1] ||= "${#{target}-dir}/#{_libdir_basename}"
    end

    idirs = idir ? Array === idir ? idir.dup : idir.split(File::PATH_SEPARATOR) : []
    if defaults
      idirs.concat(defaults.collect {|d| d + "/include"})
      idir = ([idir] + idirs).compact.join(File::PATH_SEPARATOR)
    end
    unless idirs.empty?
      idirs.collect! {|d| "-I" + d}
      idirs -= Shellwords.shellwords($CPPFLAGS)
      unless idirs.empty?
        $CPPFLAGS = (idirs.quote << $CPPFLAGS).join(" ")
      end
    end

    ldirs = ldir ? Array === ldir ? ldir.dup : ldir.split(File::PATH_SEPARATOR) : []
    if defaults
      ldirs.concat(defaults.collect {|d| "#{d}/#{_libdir_basename}"})
      ldir = ([ldir] + ldirs).compact.join(File::PATH_SEPARATOR)
    end
    $LIBPATH = ldirs | $LIBPATH

    $config_dirs[key] = [idir, ldir]
  end

  # Returns compile/link information about an installed library in a tuple of <code>[cflags,
  # ldflags, libs]</code>, by using the command found first in the following commands:
  #
  # 1. If <code>--with-{pkg}-config={command}</code> is given via
  #    command line option: <code>{command} {options}</code>
  #
  # 2. <code>{pkg}-config {options}</code>
  #
  # 3. <code>pkg-config {options} {pkg}</code>
  #
  # Where +options+ is the option name without dashes, for instance <code>"cflags"</code> for the
  # <code>--cflags</code> flag.
  #
  # The values obtained are appended to <code>$INCFLAGS</code>, <code>$CFLAGS</code>,
  # <code>$LDFLAGS</code> and <code>$libs</code>.
  #
  # If one or more <code>options</code> argument is given, the config command is
  # invoked with the options and a stripped output string is returned without
  # modifying any of the global values mentioned above.
  def pkg_config(pkg, *options)
    fmt = "not found"
    def fmt.%(x)
      x ? x.inspect : self
    end

    checking_for "pkg-config for #{pkg}", fmt do
      _, ldir = dir_config(pkg)
      if ldir
        pkg_config_path = "#{ldir}/pkgconfig"
        if File.directory?(pkg_config_path)
          Logging.message("PKG_CONFIG_PATH = %s\n", pkg_config_path)
          envs = ["PKG_CONFIG_PATH"=>[pkg_config_path, ENV["PKG_CONFIG_PATH"]].compact.join(File::PATH_SEPARATOR)]
        end
      end
      if pkgconfig = with_config("#{pkg}-config") and find_executable0(pkgconfig)
      # if and only if package specific config command is given
      elsif ($PKGCONFIG ||=
             (pkgconfig = with_config("pkg-config") {config_string("PKG_CONFIG") || "pkg-config"}) &&
             find_executable0(pkgconfig) && pkgconfig) and
           xsystem([*envs, $PKGCONFIG, "--exists", pkg])
        # default to pkg-config command
        pkgconfig = $PKGCONFIG
        args = [pkg]
      elsif find_executable0(pkgconfig = "#{pkg}-config")
      # default to package specific config command, as a last resort.
      else
        pkgconfig = nil
      end
      if pkgconfig
        get = proc {|opts|
          opts = Array(opts).map { |o| "--#{o}" }
          opts = xpopen([*envs, pkgconfig, *opts, *args], err:[:child, :out], &:read)
          Logging.open {puts opts.each_line.map{|s|"=> #{s.inspect}"}}
          opts.strip if $?.success?
        }
      end
      orig_ldflags = $LDFLAGS
      if get and !options.empty?
        get[options]
      elsif get and try_ldflags(ldflags = get['libs'])
        if incflags = get['cflags-only-I']
          $INCFLAGS << " " << incflags
          cflags = get['cflags-only-other']
        else
          cflags = get['cflags']
        end
        libs = get['libs-only-l']
        if cflags
          $CFLAGS += " " << cflags
          $CXXFLAGS += " " << cflags
        end
        if libs
          ldflags = (Shellwords.shellwords(ldflags) - Shellwords.shellwords(libs)).quote.join(" ")
        else
          libs, ldflags = Shellwords.shellwords(ldflags).partition {|s| s =~ /-l([^ ]+)/ }.map {|l|l.quote.join(" ")}
        end
        $libs += " " << libs

        $LDFLAGS = [orig_ldflags, ldflags].join(' ')
        Logging::message "package configuration for %s\n", pkg
        Logging::message "incflags: %s\ncflags: %s\nldflags: %s\nlibs: %s\n\n",
                         incflags, cflags, ldflags, libs
        [[incflags, cflags].join(' '), ldflags, libs]
      else
        Logging::message "package configuration for %s is not found\n", pkg
        nil
      end
    end
  end

  # :stopdoc:

  def with_destdir(dir)
    dir = dir.sub($dest_prefix_pattern, '')
    /\A\$[\(\{]/ =~ dir ? dir : "$(DESTDIR)"+dir
  end

  # Converts forward slashes to backslashes. Aimed at MS Windows.
  #
  # Internal use only.
  #
  def winsep(s)
    s.tr('/', '\\')
  end

  # Converts native path to format acceptable in Makefile
  #
  # Internal use only.
  #
  if !CROSS_COMPILING
    case CONFIG['build_os']
    when 'mingw32'
      def mkintpath(path)
        # mingw uses make from msys and it needs special care
        # converts from C:\some\path to /C/some/path
        path = path.dup
        path.tr!('\\', '/')
        path.sub!(/\A([A-Za-z]):(?=\/)/, '/\1')
        path
      end
    when 'cygwin', 'msys'
      if CONFIG['target_os'] != 'cygwin'
        def mkintpath(path)
          IO.popen(["cygpath", "-u", path], &:read).chomp
        end
      end
    end
  end
  unless method_defined?(:mkintpath)
    def mkintpath(path)
      path
    end
  end

  def configuration(srcdir)
    mk = []
    verbose = with_config('verbose') ?  "1" : (CONFIG['MKMF_VERBOSE'] || "0")
    vpath = $VPATH.dup
    CONFIG["hdrdir"] ||= $hdrdir
    mk << %{
SHELL = /bin/sh

# V=0 quiet, V=1 verbose.  other values don't work.
V = 1
V0 = $(V:0=)
Q1 = $(V:1=)
Q = $(Q1:0=@)
ECHO1 = $(V:1=@ #{CONFIG['NULLCMD']})
ECHO = $(ECHO1:0=@ echo)
NULLCMD = #{CONFIG['NULLCMD']}

#### Start of system configuration section. ####
#{"top_srcdir = " + $top_srcdir.sub(%r"\A#{Regexp.quote($topdir)}/", "$(topdir)/") if $extmk}
srcdir = #{srcdir.gsub(/\$\((srcdir)\)|\$\{(srcdir)\}/) {mkintpath(CONFIG[$1||$2]).unspace}}
topdir = #{mkintpath(topdir = $extmk ? CONFIG["topdir"] : $topdir).unspace}
hdrdir = #{(hdrdir = CONFIG["hdrdir"]) == topdir ? "$(topdir)" : mkintpath(hdrdir).unspace}
arch_hdrdir = #{mkintpath($arch_hdrdir).unspace}
PATH_SEPARATOR = #{CONFIG['PATH_SEPARATOR']}
VPATH = #{vpath.join(CONFIG['PATH_SEPARATOR'])}
}
    if $extmk
      mk << "RUBYLIB =\n""RUBYOPT = -\n"
    end
    prefix = mkintpath(CONFIG["prefix"])
    if destdir = prefix[$dest_prefix_pattern, 1]
      mk << "\nDESTDIR = #{destdir}\n"
      prefix = prefix[destdir.size..-1]
    end
    mk << "prefix = #{with_destdir(prefix).unspace}\n"
    CONFIG.each do |key, var|
      mk << "#{key} = #{with_destdir(mkintpath(var)).unspace}\n" if /.prefix$/ =~ key
    end
    CONFIG.each do |key, var|
      next if /^abs_/ =~ key
      next if /^(?:src|top(?:_src)?|build|hdr)dir$/ =~ key
      next unless /dir$/ =~ key
      mk << "#{key} = #{with_destdir(var)}\n"
    end
    if !$extmk and !$configure_args.has_key?('--ruby') and
        sep = config_string('BUILD_FILE_SEPARATOR')
      sep = ":/=#{sep}"
    else
      sep = ""
    end
    possible_command = (proc {|s| s if /top_srcdir|tooldir/ !~ s} unless $extmk)
    extconf_h = $extconf_h ? "-DRUBY_EXTCONF_H=\\\"$(RUBY_EXTCONF_H)\\\" " : $defs.join(" ") << " "
    headers = %w[
      $(hdrdir)/ruby.h
      $(hdrdir)/ruby/backward.h
      $(hdrdir)/ruby/ruby.h
      $(hdrdir)/ruby/defines.h
      $(hdrdir)/ruby/missing.h
      $(hdrdir)/ruby/intern.h
      $(hdrdir)/ruby/st.h
      $(hdrdir)/ruby/subst.h
    ]
    headers += $headers
    if RULE_SUBST
      headers.each {|h| h.sub!(/.*/, &RULE_SUBST.method(:%))}
    end
    headers << $config_h
    headers << '$(RUBY_EXTCONF_H)' if $extconf_h
    mk << %{

CC_WRAPPER = #{CONFIG['CC_WRAPPER']}
CC = #{CONFIG['CC']}
CXX = #{CONFIG['CXX']}
LIBRUBY = #{CONFIG['LIBRUBY']}
LIBRUBY_A = #{CONFIG['LIBRUBY_A']}
LIBRUBYARG_SHARED = #$LIBRUBYARG_SHARED
LIBRUBYARG_STATIC = #$LIBRUBYARG_STATIC
empty =
OUTFLAG = #{OUTFLAG}$(empty)
COUTFLAG = #{COUTFLAG}$(empty)
CSRCFLAG = #{CSRCFLAG}$(empty)

RUBY_EXTCONF_H = #{$extconf_h}
cflags   = #{CONFIG['cflags']}
cxxflags = #{CONFIG['cxxflags']}
optflags = #{CONFIG['optflags']}
debugflags = #{CONFIG['debugflags']}
warnflags = #{$warnflags}
cppflags = #{CONFIG['cppflags']}
CCDLFLAGS = #{$static ? '' : CONFIG['CCDLFLAGS']}
CFLAGS   = $(CCDLFLAGS) #$CFLAGS $(ARCH_FLAG)
INCFLAGS = -I. #$INCFLAGS
DEFS     = #{CONFIG['DEFS']}
CPPFLAGS = #{extconf_h}#{$CPPFLAGS}
CXXFLAGS = $(CCDLFLAGS) #$CXXFLAGS $(ARCH_FLAG)
ldflags  = #{$LDFLAGS}
dldflags = #{$DLDFLAGS} #{CONFIG['EXTDLDFLAGS']}
ARCH_FLAG = #{$ARCH_FLAG}
DLDFLAGS = $(ldflags) $(dldflags) $(ARCH_FLAG)
LDSHARED = #{CONFIG['LDSHARED']}
LDSHAREDXX = #{config_string('LDSHAREDXX') || '$(LDSHARED)'}
AR = #{CONFIG['AR']}
EXEEXT = #{CONFIG['EXEEXT']}

}
    CONFIG.each do |key, val|
      mk << "#{key} = #{val}\n" if /^RUBY.*NAME/ =~ key
    end
    mk << %{
arch = #{CONFIG['arch']}
sitearch = #{CONFIG['sitearch']}
ruby_version = #{RbConfig::CONFIG['ruby_version']}
ruby = #{$ruby.sub(%r[\A#{Regexp.quote(RbConfig::CONFIG['bindir'])}(?=/|\z)]) {'$(bindir)'}}
RUBY = $(ruby#{sep})
BUILTRUBY = #{if defined?($builtruby) && $builtruby
    $builtruby
  else
    File.join('$(bindir)', CONFIG["RUBY_INSTALL_NAME"] + CONFIG['EXEEXT'])
  end}
ruby_headers = #{headers.join(' ')}

RM = #{config_string('RM', &possible_command) || '$(RUBY) -run -e rm -- -f'}
RM_RF = #{config_string('RMALL', &possible_command) || '$(RUBY) -run -e rm -- -rf'}
RMDIRS = #{config_string('RMDIRS', &possible_command) || '$(RUBY) -run -e rmdir -- -p'}
MAKEDIRS = #{config_string('MAKEDIRS', &possible_command) || '@$(RUBY) -run -e mkdir -- -p'}
INSTALL = #{config_string('INSTALL', &possible_command) || '@$(RUBY) -run -e install -- -vp'}
INSTALL_PROG = #{config_string('INSTALL_PROG') || '$(INSTALL) -m 0755'}
INSTALL_DATA = #{config_string('INSTALL_DATA') || '$(INSTALL) -m 0644'}
COPY = #{config_string('CP', &possible_command) || '@$(RUBY) -run -e cp -- -v'}
TOUCH = exit >

#### End of system configuration section. ####

preload = #{defined?($preload) && $preload ? $preload.join(' ') : ''}
}
    mk
  end

  def timestamp_file(name, target_prefix = nil)
    pat = {}
    name = '$(RUBYARCHDIR)' if name == '$(TARGET_SO_DIR)'
    install_dirs.each do |n, d|
      pat[n] = $` if /\$\(target_prefix\)\z/ =~ d
    end
    name = name.gsub(/\$\((#{pat.keys.join("|")})\)/) {pat[$1]+target_prefix}
    name.sub!(/(\$\((?:site)?arch\))\/*/, '')
    arch = $1 || ''
    name.chomp!('/')
    name = name.gsub(/(\$[({]|[})])|(\/+)|[^-.\w]+/) {$1 ? "" : $2 ? ".-." : "_"}
    File.join("$(TIMESTAMP_DIR)", arch, "#{name.sub(/\A(?=.)/, '.')}.time")
  end
  # :startdoc:

  # Creates a stub Makefile.
  #
  def dummy_makefile(srcdir)
    configuration(srcdir) << <<RULES << CLEANINGS
CLEANFILES = #{$cleanfiles.join(' ')}
DISTCLEANFILES = #{$distcleanfiles.join(' ')}

all install static install-so install-rb: Makefile
	@$(NULLCMD)
.PHONY: all install static install-so install-rb
.PHONY: clean clean-so clean-static clean-rb

RULES
  end

  def each_compile_rules # :nodoc:
    vpath_splat = /\$\(\*VPATH\*\)/
    COMPILE_RULES.each do |rule|
      if vpath_splat =~ rule
        $VPATH.each do |path|
          yield rule.sub(vpath_splat) {path}
        end
      else
        yield rule
      end
    end
  end

  # Processes the data contents of the "depend" file.  Each line of this file
  # is expected to be a file name.
  #
  # Returns the output of findings, in Makefile format.
  #
  def depend_rules(depend)
    suffixes = []
    depout = []
    cont = implicit = nil
    impconv = proc do
      each_compile_rules {|rule| depout << (rule % implicit[0]) << implicit[1]}
      implicit = nil
    end
    ruleconv = proc do |line|
      if implicit
        if /\A\t/ =~ line
          implicit[1] << line
          next
        else
          impconv[]
        end
      end
      if m = /\A\.(\w+)\.(\w+)(?:\s*:)/.match(line)
        suffixes << m[1] << m[2]
        implicit = [[m[1], m[2]], [m.post_match]]
        next
      elsif RULE_SUBST and /\A(?!\s*\w+\s*=)[$\w][^#]*:/ =~ line
        line.sub!(/\s*\#.*$/, '')
        comment = $&
        line.gsub!(%r"(\s)(?!\.)([^$(){}+=:\s\\,]+)(?=\s|\z)") {$1 + RULE_SUBST % $2}
        line = line.chomp + comment + "\n" if comment
      end
      depout << line
    end
    depend.each_line do |line|
      line.gsub!(/\.o\b/, ".#{$OBJEXT}")
      line.gsub!(/\{\$\(VPATH\)\}/, "") unless $nmake
      line.gsub!(/\$\((?:hdr|top)dir\)\/config.h/, $config_h)
      if $nmake && /\A\s*\$\(RM|COPY\)/ =~ line
        line.gsub!(%r"[-\w\./]{2,}"){$&.tr("/", "\\")}
        line.gsub!(/(\$\((?!RM|COPY)[^:)]+)(?=\))/, '\1:/=\\')
      end
      if /(?:^|[^\\])(?:\\\\)*\\$/ =~ line
        (cont ||= []) << line
        next
      elsif cont
        line = (cont << line).join
        cont = nil
      end
      ruleconv.call(line)
    end
    if cont
      ruleconv.call(cont.join)
    elsif implicit
      impconv.call
    end
    unless suffixes.empty?
      depout.unshift(".SUFFIXES: ." + suffixes.uniq.join(" .") + "\n\n")
    end
    if $extconf_h
      depout.unshift("$(OBJS): $(RUBY_EXTCONF_H)\n\n")
      depout.unshift("$(OBJS): $(hdrdir)/ruby/win32.h\n\n") if $mswin or $mingw
    end
    depout.flatten!
    depout
  end

  # Generates the Makefile for your extension, passing along any options and
  # preprocessor constants that you may have generated through other methods.
  #
  # The +target+ name should correspond the name of the global function name
  # defined within your C extension, minus the +Init_+.  For example, if your
  # C extension is defined as +Init_foo+, then your target would simply be
  # "foo".
  #
  # If any "/" characters are present in the target name, only the last name
  # is interpreted as the target name, and the rest are considered toplevel
  # directory names, and the generated Makefile will be altered accordingly to
  # follow that directory structure.
  #
  # For example, if you pass "test/foo" as a target name, your extension will
  # be installed under the "test" directory.  This means that in order to
  # load the file within a Ruby program later, that directory structure will
  # have to be followed, e.g. <code>require 'test/foo'</code>.
  #
  # The +srcprefix+ should be used when your source files are not in the same
  # directory as your build script. This will not only eliminate the need for
  # you to manually copy the source files into the same directory as your
  # build script, but it also sets the proper +target_prefix+ in the generated
  # Makefile.
  #
  # Setting the +target_prefix+ will, in turn, install the generated binary in
  # a directory under your <code>RbConfig::CONFIG['sitearchdir']</code> that
  # mimics your local filesystem when you run <code>make install</code>.
  #
  # For example, given the following file tree:
  #
  #   ext/
  #     extconf.rb
  #     test/
  #       foo.c
  #
  # And given the following code:
  #
  #   create_makefile('test/foo', 'test')
  #
  # That will set the +target_prefix+ in the generated Makefile to "test".
  # That, in turn, will create the following file tree when installed via the
  # <code>make install</code> command:
  #
  #   /path/to/ruby/sitearchdir/test/foo.so
  #
  # It is recommended that you use this approach to generate your makefiles,
  # instead of copying files around manually, because some third party
  # libraries may depend on the +target_prefix+ being set properly.
  #
  # The +srcprefix+ argument can be used to override the default source
  # directory, i.e. the current directory.  It is included as part of the
  # +VPATH+ and added to the list of +INCFLAGS+.
  #
  def create_makefile(target, srcprefix = nil)
    $target = target
    libpath = $DEFLIBPATH|$LIBPATH
    message "creating Makefile\n"
    MakeMakefile.rm_f "#{CONFTEST}*"
    if CONFIG["DLEXT"] == $OBJEXT
      for lib in libs = $libs.split(' ')
        lib.sub!(/-l(.*)/, %%"lib\\1.#{$LIBEXT}"%)
      end
      $defs.push(format("-DEXTLIB='%s'", libs.join(",")))
    end

    if target.include?('/')
      target_prefix, target = File.split(target)
      target_prefix[0,0] = '/'
    else
      target_prefix = ""
    end

    srcprefix ||= "$(srcdir)/#{srcprefix}".chomp('/')
    RbConfig.expand(srcdir = srcprefix.dup)

    ext = ".#{$OBJEXT}"
    orig_srcs = Dir[File.join(srcdir, "*.{#{SRC_EXT.join(%q{,})}}")]
    if not $objs
      srcs = $srcs || orig_srcs
      $objs = []
      objs = srcs.inject(Hash.new {[]}) {|h, f|
        h.key?(o = File.basename(f, ".*") << ext) or $objs << o
        h[o] <<= f
        h
      }
      unless objs.delete_if {|b, f| f.size == 1}.empty?
        dups = objs.map {|b, f|
          "#{b[/.*\./]}{#{f.collect {|n| n[/([^.]+)\z/]}.join(',')}}"
        }
        abort "source files duplication - #{dups.join(", ")}"
      end
    else
      $objs.collect! {|o| File.basename(o, ".*") << ext} unless $OBJEXT == "o"
      srcs = $srcs || $objs.collect {|o| o.chomp(ext) << ".c"}
    end
    $srcs = srcs

    hdrs = Dir[File.join(srcdir, "*.{#{HDR_EXT.join(%q{,})}}")]

    target = nil if $objs.empty?

    if target and EXPORT_PREFIX
      if File.exist?(File.join(srcdir, target + '.def'))
        deffile = "$(srcdir)/$(TARGET).def"
        unless EXPORT_PREFIX.empty?
          makedef = %{$(RUBY) -pe "$$_.sub!(/^(?=\\w)/,'#{EXPORT_PREFIX}') unless 1../^EXPORTS$/i" #{deffile}}
        end
      else
        makedef = %{(echo EXPORTS && echo $(TARGET_ENTRY))}
      end
      if makedef
        $cleanfiles << '$(DEFFILE)'
        origdef = deffile
        deffile = "$(TARGET)-$(arch).def"
      end
    end
    origdef ||= ''

    if $extout and $INSTALLFILES
      $cleanfiles.concat($INSTALLFILES.collect {|files, dir|File.join(dir, files.delete_prefix('./'))})
      $distcleandirs.concat($INSTALLFILES.collect {|files, dir| dir})
    end

    if $extmk and $static
      $defs << "-DRUBY_EXPORT=1"
    end

    if $extmk and not $extconf_h
      create_header
    end

    libpath = libpathflag(libpath)

    dllib = target ? "$(TARGET).#{CONFIG['DLEXT']}" : ""
    staticlib = target ? "$(TARGET).#$LIBEXT" : ""
    conf = configuration(srcprefix)
    conf << "\
libpath = #{($DEFLIBPATH|$LIBPATH).join(" ")}
LIBPATH = #{libpath}
DEFFILE = #{deffile}

CLEANFILES = #{$cleanfiles.join(' ')}
DISTCLEANFILES = #{$distcleanfiles.join(' ')}
DISTCLEANDIRS = #{$distcleandirs.join(' ')}

extout = #{$extout && $extout.quote}
extout_prefix = #{$extout_prefix}
target_prefix = #{target_prefix}
LOCAL_LIBS = #{$LOCAL_LIBS}
LIBS = #{$LIBRUBYARG} #{$libs} #{$LIBS}
ORIG_SRCS = #{orig_srcs.collect(&File.method(:basename)).join(' ')}
SRCS = $(ORIG_SRCS) #{(srcs - orig_srcs).collect(&File.method(:basename)).join(' ')}
OBJS = #{$objs.join(" ")}
HDRS = #{hdrs.map{|h| '$(srcdir)/' + File.basename(h)}.join(' ')}
LOCAL_HDRS = #{$headers.join(' ')}
TARGET = #{target}
TARGET_NAME = #{target && target[/\A\w+/]}
TARGET_ENTRY = #{EXPORT_PREFIX || ''}Init_$(TARGET_NAME)
DLLIB = #{dllib}
EXTSTATIC = #{$static || ""}
STATIC_LIB = #{staticlib unless $static.nil?}
#{!$extout && defined?($installed_list) ? "INSTALLED_LIST = #{$installed_list}\n" : ""}
TIMESTAMP_DIR = #{$extout && $extmk ? '$(extout)/.timestamp' : '.'}
" #"
    # TODO: fixme
    install_dirs.each {|d| conf << ("%-14s= %s\n" % d) if /^[[:upper:]]/ =~ d[0]}
    sodir = $extout ? '$(TARGET_SO_DIR)' : '$(RUBYARCHDIR)'
    n = '$(TARGET_SO_DIR)$(TARGET)'
    cleanobjs = ["$(OBJS)"]
    if $extmk
      %w[bc i s].each {|ex| cleanobjs << "$(OBJS:.#{$OBJEXT}=.#{ex})"}
    end
    if target
      config_string('cleanobjs') {|t| cleanobjs << t.gsub(/\$\*/, "$(TARGET)#{deffile ? '-$(arch)': ''}")}
    end
    conf << "\
TARGET_SO_DIR =#{$extout ? " $(RUBYARCHDIR)/" : ''}
TARGET_SO     = $(TARGET_SO_DIR)$(DLLIB)
CLEANLIBS     = #{'$(TARGET_SO) ' if target}#{config_string('cleanlibs') {|t| t.gsub(/\$\*/) {n}}}
CLEANOBJS     = #{cleanobjs.join(' ')} *.bak
TARGET_SO_DIR_TIMESTAMP = #{timestamp_file(sodir, target_prefix)}
" #"

    conf = yield(conf) if block_given?
    mfile = File.open("Makefile", "wb")
    mfile.puts(conf)
    mfile.print "
all:    #{$extout ? "install" : target ? "$(DLLIB)" : "Makefile"}
static: #{$extmk && !$static ? "all" : "$(STATIC_LIB)#{$extout ? " install-rb" : ""}"}
.PHONY: all install static install-so install-rb
.PHONY: clean clean-so clean-static clean-rb
" #"
    mfile.print CLEANINGS
    fsep = config_string('BUILD_FILE_SEPARATOR') {|s| s unless s == "/"}
    if fsep
      sep = ":/=#{fsep}"
      fseprepl = proc {|s|
        s = s.gsub("/", fsep)
        s = s.gsub(/(\$\(\w+)(\))/) {$1+sep+$2}
        s.gsub(/(\$\{\w+)(\})/) {$1+sep+$2}
      }
      rsep = ":#{fsep}=/"
    else
      fseprepl = proc {|s| s}
      sep = ""
      rsep = ""
    end
    dirs = []
    mfile.print "install: install-so install-rb\n\n"
    dir = sodir.dup
    mfile.print("install-so: ")
    if target
      f = "$(DLLIB)"
      dest = "$(TARGET_SO)"
      stamp = '$(TARGET_SO_DIR_TIMESTAMP)'
      if $extout
        mfile.puts dest
        mfile.print "clean-so::\n"
        mfile.print "\t-$(Q)$(RM) #{fseprepl[dest]} #{fseprepl[stamp]}\n"
        mfile.print "\t-$(Q)$(RMDIRS) #{fseprepl[dir]}#{$ignore_error}\n"
      else
        mfile.print "#{f} #{stamp}\n"
        mfile.print "\t$(INSTALL_PROG) #{fseprepl[f]} #{dir}\n"
        if defined?($installed_list)
          mfile.print "\t@echo #{dir}/#{File.basename(f)}>>$(INSTALLED_LIST)\n"
        end
      end
      mfile.print "clean-static::\n"
      mfile.print "\t-$(Q)$(RM) $(STATIC_LIB)\n"
    else
      mfile.puts "Makefile"
    end
    mfile.print("install-rb: pre-install-rb do-install-rb install-rb-default\n")
    mfile.print("install-rb-default: pre-install-rb-default do-install-rb-default\n")
    mfile.print("pre-install-rb: Makefile\n")
    mfile.print("pre-install-rb-default: Makefile\n")
    mfile.print("do-install-rb:\n")
    mfile.print("do-install-rb-default:\n")
    for sfx, i in [["-default", [["lib/**/*.rb", "$(RUBYLIBDIR)", "lib"]]], ["", $INSTALLFILES]]
      files = install_files(mfile, i, nil, srcprefix) or next
      for dir, *files in files
        unless dirs.include?(dir)
          dirs << dir
          mfile.print "pre-install-rb#{sfx}: #{timestamp_file(dir, target_prefix)}\n"
        end
        for f in files
          dest = "#{dir}/#{File.basename(f)}"
          mfile.print("do-install-rb#{sfx}: #{dest}\n")
          mfile.print("#{dest}: #{f} #{timestamp_file(dir, target_prefix)}\n")
          mfile.print("\t$(Q) $(#{$extout ? 'COPY' : 'INSTALL_DATA'}) #{f} $(@D)\n")
          if defined?($installed_list) and !$extout
            mfile.print("\t@echo #{dest}>>$(INSTALLED_LIST)\n")
          end
          if $extout
            mfile.print("clean-rb#{sfx}::\n")
            mfile.print("\t-$(Q)$(RM) #{fseprepl[dest]}\n")
          end
        end
      end
      mfile.print "pre-install-rb#{sfx}:\n"
      if files.empty?
        mfile.print("\t@$(NULLCMD)\n")
      else
        q = "$(MAKE) -q do-install-rb#{sfx}"
        if $nmake
          mfile.print "!if \"$(Q)\" == \"@\"\n\t@#{q} || \\\n!endif\n\t"
        else
          mfile.print "\t$(Q1:0=@#{q} || )"
        end
        mfile.print "$(ECHO1:0=echo) installing#{sfx.sub(/^-/, " ")} #{target} libraries\n"
      end
      if $extout
        dirs.uniq!
        unless dirs.empty?
          mfile.print("clean-rb#{sfx}::\n")
          for dir in dirs.sort_by {|d| -d.count('/')}
            stamp = timestamp_file(dir, target_prefix)
            mfile.print("\t-$(Q)$(RM) #{fseprepl[stamp]}\n")
            mfile.print("\t-$(Q)$(RMDIRS) #{fseprepl[dir]}#{$ignore_error}\n")
          end
        end
      end
    end
    if target and !dirs.include?(sodir)
      mfile.print "$(TARGET_SO_DIR_TIMESTAMP):\n\t$(Q) $(MAKEDIRS) $(@D) #{sodir}\n\t$(Q) $(TOUCH) $@\n"
    end
    dirs.each do |d|
      t = timestamp_file(d, target_prefix)
      mfile.print "#{t}:\n\t$(Q) $(MAKEDIRS) $(@D) #{d}\n\t$(Q) $(TOUCH) $@\n"
    end

    mfile.print <<-SITEINSTALL

site-install: site-install-so site-install-rb
site-install-so: install-so
site-install-rb: install-rb

    SITEINSTALL

    return unless target

    mfile.print ".SUFFIXES: .#{(SRC_EXT + [$OBJEXT, $ASMEXT]).compact.join(' .')}\n"
    mfile.print "\n"

    compile_command = "\n\t$(ECHO) compiling $(<#{rsep})\n\t$(Q) %s\n\n"
    command = compile_command % COMPILE_CXX
    asm_command = compile_command.sub(/compiling/, 'translating') % ASSEMBLE_CXX
    CXX_EXT.each do |e|
      each_compile_rules do |rule|
        mfile.printf(rule, e, $OBJEXT)
        mfile.print(command)
        mfile.printf(rule, e, $ASMEXT)
        mfile.print(asm_command)
      end
    end
    command = compile_command % COMPILE_C
    asm_command = compile_command.sub(/compiling/, 'translating') % ASSEMBLE_C
    C_EXT.each do |e|
      each_compile_rules do |rule|
        mfile.printf(rule, e, $OBJEXT)
        mfile.print(command)
        mfile.printf(rule, e, $ASMEXT)
        mfile.print(asm_command)
      end
    end

    mfile.print "$(TARGET_SO): "
    mfile.print "$(DEFFILE) " if makedef
    mfile.print "$(OBJS) Makefile"
    mfile.print " $(TARGET_SO_DIR_TIMESTAMP)" if $extout
    mfile.print "\n"
    mfile.print "\t$(ECHO) linking shared-object #{target_prefix.sub(/\A\/(.*)/, '\1/')}$(DLLIB)\n"
    mfile.print "\t-$(Q)$(RM) $(@#{sep})\n"
    link_so = LINK_SO.gsub(/^/, "\t$(Q) ")
    if srcs.any?(&%r"\.(?:#{CXX_EXT.join('|')})\z".method(:===))
      link_so = link_so.sub(/\bLDSHARED\b/, '\&XX')
    end
    mfile.print link_so, "\n\n"
    unless $static.nil?
      mfile.print "$(STATIC_LIB): $(OBJS)\n\t-$(Q)$(RM) $(@#{sep})\n\t"
      mfile.print "$(ECHO) linking static-library $(@#{rsep})\n\t$(Q) "
      mfile.print "$(AR) #{config_string('ARFLAGS') || 'cru '}$@ $(OBJS)"
      config_string('RANLIB') do |ranlib|
        mfile.print "\n\t-$(Q)#{ranlib} $(@)#{$ignore_error}"
      end
    end
    mfile.print "\n\n"
    if makedef
      mfile.print "$(DEFFILE): #{origdef}\n"
      mfile.print "\t$(ECHO) generating $(@#{rsep})\n"
      mfile.print "\t$(Q) #{makedef} > $@\n\n"
    end

    depend = File.join(srcdir, "depend")
    if File.exist?(depend)
      mfile.print("###\n", *depend_rules(File.read(depend)))
    else
      mfile.print "$(OBJS): $(HDRS) $(ruby_headers)\n"
    end

    $makefile_created = true
  ensure
    mfile.close if mfile
  end

  # :stopdoc:

  def init_mkmf(config = CONFIG, rbconfig = RbConfig::CONFIG)
    $makefile_created = false
    $arg_config = []
    $enable_shared = config['ENABLE_SHARED'] == 'yes'
    $defs = []
    $extconf_h = nil
    $config_dirs = {}

    if $warnflags = CONFIG['warnflags'] and CONFIG['GCC'] == 'yes'
      # turn warnings into errors only for bundled extensions.
      config['warnflags'] = $warnflags.gsub(/(?:\A|\s)-W\Kerror[-=](?!implicit-function-declaration)/, '')
      if /icc\z/ =~ config['CC']
        config['warnflags'].gsub!(/(\A|\s)-W(?:division-by-zero|deprecated-declarations)/, '\1')
      end
      RbConfig.expand(rbconfig['warnflags'] = config['warnflags'].dup)
      config.each do |key, val|
        RbConfig.expand(rbconfig[key] = val.dup) if /warnflags/ =~ val
      end
      $warnflags = config['warnflags'] unless $extmk
    end
    if (w = rbconfig['CC_WRAPPER']) and !w.empty? and !File.executable?(w)
      rbconfig['CC_WRAPPER'] = config['CC_WRAPPER'] = ''
    end
    $CFLAGS = with_config("cflags", arg_config("CFLAGS", config["CFLAGS"])).dup
    $CXXFLAGS = (with_config("cxxflags", arg_config("CXXFLAGS", config["CXXFLAGS"]))||'').dup
    $ARCH_FLAG = with_config("arch_flag", arg_config("ARCH_FLAG", config["ARCH_FLAG"])).dup
    $CPPFLAGS = with_config("cppflags", arg_config("CPPFLAGS", config["CPPFLAGS"])).dup
    $LDFLAGS = with_config("ldflags", arg_config("LDFLAGS", config["LDFLAGS"])).dup
    $INCFLAGS = "-I$(arch_hdrdir)"
    $INCFLAGS << " -I$(hdrdir)/ruby/backward" unless $extmk
    $INCFLAGS << " -I$(hdrdir) -I$(srcdir)"
    $DLDFLAGS = with_config("dldflags", arg_config("DLDFLAGS", config["DLDFLAGS"])).dup
    config_string("ADDITIONAL_DLDFLAGS") {|flags| $DLDFLAGS << " " << flags} unless $extmk
    $LIBEXT = config['LIBEXT'].dup
    $OBJEXT = config["OBJEXT"].dup
    $EXEEXT = config["EXEEXT"].dup
    $ASMEXT = config_string('ASMEXT', &:dup) || 'S'
    $LIBS = "#{config['LIBS']} #{config['DLDLIBS']}"
    $LIBRUBYARG = ""
    $LIBRUBYARG_STATIC = config['LIBRUBYARG_STATIC']
    $LIBRUBYARG_SHARED = config['LIBRUBYARG_SHARED']
    $DEFLIBPATH = [$extmk ? "$(topdir)" : "$(#{config["libdirname"] || "libdir"})"]
    $DEFLIBPATH.unshift(".")
    $LIBPATH = []
    $INSTALLFILES = []
    $NONINSTALLFILES = [/~\z/, /\A#.*#\z/, /\A\.#/, /\.bak\z/i, /\.orig\z/, /\.rej\z/, /\.l[ao]\z/, /\.o\z/]
    $VPATH = %w[$(srcdir) $(arch_hdrdir)/ruby $(hdrdir)/ruby]

    $objs = nil
    $srcs = nil
    $headers = []
    $libs = ""
    if $enable_shared or RbConfig.expand(config["LIBRUBY"].dup) != RbConfig.expand(config["LIBRUBY_A"].dup)
      $LIBRUBYARG = config['LIBRUBYARG']
    end

    $LOCAL_LIBS = ""

    $cleanfiles = config_string('CLEANFILES') {|s| Shellwords.shellwords(s)} || []
    $cleanfiles << "mkmf.log"
    $distcleanfiles = config_string('DISTCLEANFILES') {|s| Shellwords.shellwords(s)} || []
    $distcleandirs = config_string('DISTCLEANDIRS') {|s| Shellwords.shellwords(s)} || []

    $extout ||= nil
    $extout_prefix ||= nil

    $arg_config.clear
    $config_dirs.clear
    dir_config("opt")
  end

  FailedMessage = <<MESSAGE
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
MESSAGE

  # Returns whether or not the Makefile was successfully generated. If not,
  # the script will abort with an error message.
  #
  # Internal use only.
  #
  def mkmf_failed(path)
    unless $makefile_created or File.exist?("Makefile")
      opts = $arg_config.collect {|t, n| "\t#{t}#{n ? "=#{n}" : ""}\n"}
      abort "*** #{path} failed ***\n" + FailedMessage + opts.join
    end
  end

  private

  def _libdir_basename
    @libdir_basename ||= config_string("libdir") {|name| name[/\A\$\(exec_prefix\)\/(.*)/, 1]} || "lib"
  end

  def MAIN_DOES_NOTHING(*refs)
    src = MAIN_DOES_NOTHING
    unless refs.empty?
      src = src.sub(/\{/) do
        $& +
          "\n  if (argc > 1000000) {\n" +
          refs.map {|n|"    int (* volatile #{n}p)(void)=(int (*)(void))&#{n};\n"}.join("") +
          refs.map {|n|"    printf(\"%d\", (*#{n}p)());\n"}.join("") +
          "  }\n"
      end
    end
    src
  end

  extend self
  init_mkmf

  $make = with_config("make-prog", ENV["MAKE"] || "make")
  make, = Shellwords.shellwords($make)
  $nmake = nil
  case
  when $mswin
    $nmake = ?m if /nmake/i =~ make
  end
  $ignore_error = " 2> #{File::NULL} || #{$mswin ? 'exit /b0' : 'true'}"

  RbConfig::CONFIG["srcdir"] = CONFIG["srcdir"] =
    $srcdir = arg_config("--srcdir", File.dirname($0))
  $configure_args["--topsrcdir"] ||= $srcdir
  if $curdir = arg_config("--curdir")
    RbConfig.expand(curdir = $curdir.dup)
  else
    curdir = $curdir = "."
  end
  unless File.expand_path(RbConfig::CONFIG["topdir"]) == File.expand_path(curdir)
    CONFIG["topdir"] = $curdir
    RbConfig::CONFIG["topdir"] = curdir
  end
  $configure_args["--topdir"] ||= $curdir
  $ruby = arg_config("--ruby", File.join(RbConfig::CONFIG["bindir"], CONFIG["ruby_install_name"]))

  RbConfig.expand(CONFIG["RUBY_SO_NAME"])

  # :startdoc:

  split = Shellwords.method(:shellwords).to_proc

  EXPORT_PREFIX = config_string('EXPORT_PREFIX') {|s| s.strip}

  hdr = ['#include "ruby.h"' "\n"]
  config_string('COMMON_MACROS') do |s|
    Shellwords.shellwords(s).each do |w|
      w, v = w.split(/=/, 2)
      hdr << "#ifndef #{w}"
      hdr << "#define #{[w, v].compact.join(" ")}"
      hdr << "#endif /* #{w} */"
    end
  end
  config_string('COMMON_HEADERS') do |s|
    Shellwords.shellwords(s).each {|w| hdr << "#include <#{w}>"}
  end

  ##
  # Common headers for Ruby C extensions

  COMMON_HEADERS = hdr.join("\n")

  ##
  # Common libraries for Ruby C extensions

  COMMON_LIBS = config_string('COMMON_LIBS', &split) || []

  ##
  # make compile rules

  COMPILE_RULES = config_string('COMPILE_RULES', &split) || %w[.%s.%s:]
  RULE_SUBST = config_string('RULE_SUBST')

  ##
  # Command which will compile C files in the generated Makefile

  COMPILE_C = config_string('COMPILE_C') || '$(CC) $(INCFLAGS) $(CPPFLAGS) $(CFLAGS) $(COUTFLAG)$@ -c $(CSRCFLAG)$<'

  ##
  # Command which will compile C++ files in the generated Makefile

  COMPILE_CXX = config_string('COMPILE_CXX') || '$(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $(CSRCFLAG)$<'

  ##
  # Command which will translate C files to assembler sources in the generated Makefile

  ASSEMBLE_C = config_string('ASSEMBLE_C') || COMPILE_C.sub(/(?<=\s)-c(?=\s)/, '-S')

  ##
  # Command which will translate C++ files to assembler sources in the generated Makefile

  ASSEMBLE_CXX = config_string('ASSEMBLE_CXX') || COMPILE_CXX.sub(/(?<=\s)-c(?=\s)/, '-S')

  ##
  # Command which will compile a program in order to test linking a library

  TRY_LINK = config_string('TRY_LINK') ||
    "$(CC) #{OUTFLAG}#{CONFTEST}#{$EXEEXT} $(INCFLAGS) $(CPPFLAGS) " \
    "$(CFLAGS) $(src) $(LIBPATH) $(LDFLAGS) $(ARCH_FLAG) $(LOCAL_LIBS) $(LIBS)"

  ##
  # Command which will link a shared library

  LINK_SO = (config_string('LINK_SO') || "").sub(/^$/) do
    if CONFIG["DLEXT"] == $OBJEXT
      "ld $(DLDFLAGS) -r -o $@ $(OBJS)\n"
    else
      "$(LDSHARED) #{OUTFLAG}$@ $(OBJS) " \
      "$(LIBPATH) $(DLDFLAGS) $(LOCAL_LIBS) $(LIBS)"
    end
  end

  ##
  # Argument which will add a library path to the linker

  LIBPATHFLAG = config_string('LIBPATHFLAG') || ' -L%s'
  RPATHFLAG = config_string('RPATHFLAG') || ''

  ##
  # Argument which will add a library to the linker

  LIBARG = config_string('LIBARG') || '-l%s'

  ##
  # A C main function which does no work

  MAIN_DOES_NOTHING = config_string('MAIN_DOES_NOTHING') || "int main(int argc, char **argv)\n{\n  return !!argv[argc];\n}"
  UNIVERSAL_INTS = config_string('UNIVERSAL_INTS') {|s| Shellwords.shellwords(s)} ||
    %w[int short long long\ long]

  sep = config_string('BUILD_FILE_SEPARATOR') {|s| ":/=#{s}" if s != "/"} || ""

  ##
  # Makefile rules that will clean the extension build directory

  CLEANINGS = "
clean-static::
clean-rb-default::
clean-rb::
clean-so::
clean: clean-so clean-static clean-rb-default clean-rb
\t\t-$(Q)$(RM_RF) $(CLEANLIBS#{sep}) $(CLEANOBJS#{sep}) $(CLEANFILES#{sep}) .*.time

distclean-rb-default::
distclean-rb::
distclean-so::
distclean-static::
distclean: clean distclean-so distclean-static distclean-rb-default distclean-rb
\t\t-$(Q)$(RM) Makefile $(RUBY_EXTCONF_H) #{CONFTEST}.* mkmf.log#{' exts.mk' if $extmk}
\t\t-$(Q)$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES#{sep})
\t\t-$(Q)$(RMDIRS) $(DISTCLEANDIRS#{sep})#{$ignore_error}

realclean: distclean
"

  @lang = Hash.new(self)

  def self.[](name)
    @lang.fetch(name)
  end

  def self.[]=(name, mod)
    @lang[name] = mod
  end

  self["C++"] = Module.new do
    include MakeMakefile
    extend self

    CONFTEST_CXX = "#{CONFTEST}.#{config_string('CXX_EXT') || CXX_EXT[0]}"

    TRY_LINK_CXX = config_string('TRY_LINK_CXX') ||
                   ((cmd = TRY_LINK.gsub(/\$\(C(?:C|(FLAGS))\)/, '$(CXX\1)')) != TRY_LINK && cmd) ||
                   "$(CXX) #{OUTFLAG}#{CONFTEST}#{$EXEEXT} $(INCFLAGS) $(CPPFLAGS) " \
                   "$(CXXFLAGS) $(src) $(LIBPATH) $(LDFLAGS) $(ARCH_FLAG) $(LOCAL_LIBS) $(LIBS)"

    def have_devel?
      unless defined? @have_devel
        @have_devel = true
        @have_devel = try_link(MAIN_DOES_NOTHING)
      end
      @have_devel
    end

    def conftest_source
      CONFTEST_CXX
    end

    def cc_command(opt="")
      conf = cc_config(opt)
      RbConfig::expand("$(CXX) #$INCFLAGS #$CPPFLAGS #$CXXFLAGS #$ARCH_FLAG #{opt} -c #{CONFTEST_CXX}",
                       conf)
    end

    def link_command(ldflags, *opts)
      conf = link_config(ldflags, *opts)
      RbConfig::expand(TRY_LINK_CXX.dup, conf)
    end
  end
end

# MakeMakefile::Global = #
m = Module.new {
  include(MakeMakefile)
  private(*MakeMakefile.public_instance_methods(false))
}
include m

if not $extmk and /\A(extconf|makefile).rb\z/ =~ File.basename($0)
  END {mkmf_failed($0)}
end

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