Class: RMagick::Extconf

Inherits:
Object
  • Object
show all
Defined in:
ext/RMagick/extconf.rb

Constant Summary collapse

RMAGICK_VERS = 
::Magick::VERSION
MIN_RUBY_VERS = 
::Magick::MIN_RUBY_VERSION
MIN_RUBY_VERS_NO = 
MIN_RUBY_VERS.tr('.', '').to_i

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Extconf

Returns a new instance of Extconf.



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# File 'ext/RMagick/extconf.rb', line 16

def initialize
  configure_compile_options
  assert_can_compile!
  configure_headers
end

Instance Attribute Details

#headers ⇒ Object (readonly)

Returns the value of attribute headers.



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# File 'ext/RMagick/extconf.rb', line 14

def headers
  @headers
end

Instance Method Details

#assert_can_compile! ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 294

def assert_can_compile!
  assert_not_windows!
  assert_minimum_ruby_version!
  assert_has_dev_libs!
end

#assert_has_dev_libs! ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 323

def assert_has_dev_libs!
  return unless RUBY_PLATFORM !~ /mswin|mingw/

  # check for pkg-config if Magick-config doesn't exist
  if $magick_config && `Magick-config --libs`[/\bl\s*(MagickCore|Magick)6?\b/]
  elsif $pkg_config && `pkg-config --libs MagickCore`[/\bl\s*(MagickCore|Magick)6?\b/]
  else
    exit_failure "Can't install RMagick #{RMAGICK_VERS}. " \
               "Can't find the ImageMagick library or one of the dependent libraries. " \
               "Check the mkmf.log file for more detailed information.\n"
  end
end

#assert_minimum_ruby_version! ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 314

def assert_minimum_ruby_version!
  unless checking_for("Ruby version >= #{MIN_RUBY_VERS}") do
    version = RUBY_VERSION.tr('.', '').to_i
    version >= MIN_RUBY_VERS_NO
  end
    exit_failure "Can't install RMagick #{RMAGICK_VERS}. Ruby #{MIN_RUBY_VERS} or later required.\n"
  end
end

#assert_not_windows! ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 300

def assert_not_windows!
  return unless RUBY_PLATFORM =~ /mswin/

  abort "+----------------------------------------------------------------------------+\n| This rmagick gem is for use only on Linux, BSD, OS X, and similar systems  |\n| that have a gnu or similar toolchain installed. The rmagick-win32 gem is a |\n| pre-compiled version of RMagick bundled with ImageMagick for use on        |\n| Microsoft Windows systems. The rmagick-win32 gem is available on RubyForge.|\n| See http://rmagick.rubyforge.org/install-faq.html for more information.    |\n+----------------------------------------------------------------------------+\n"
end

#check_multiple_imagemagick_versions ⇒ Object

Seems like lots of people have multiple versions of ImageMagick installed.



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# File 'ext/RMagick/extconf.rb', line 202

def check_multiple_imagemagick_versions
  versions = []
  path = ENV['PATH'].split(File::PATH_SEPARATOR)
  path.each do |dir|
    file = File.join(dir, 'Magick-config')
    next unless File.executable? file

    vers = `#{file} --version`.chomp.strip
    prefix = `#{file} --prefix`.chomp.strip
    versions << [vers, prefix, dir]
  end
  versions.uniq!
  return unless versions.size > 1

  msg = "\nWarning: Found more than one ImageMagick installation. This could cause problems at runtime.\n"
  versions.each do |vers, prefix, dir|
    msg << "         #{dir}/Magick-config reports version #{vers} is installed in #{prefix}\n"
  end
  msg << "Using #{versions[0][0]} from #{versions[0][1]}.\n\n"
  Logging.message msg
  message msg
end

#check_partial_imagemagick_versions ⇒ Object

Ubuntu (maybe other systems) comes with a partial installation of ImageMagick in the prefix /usr (some libraries, no includes, and no binaries). This causes problems when /usr/lib is in the path (e.g., using the default Ruby installation).



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# File 'ext/RMagick/extconf.rb', line 229

def check_partial_imagemagick_versions
  prefix = config_string('prefix') || ''
  matches = [
    prefix + '/lib/lib?agick*',
    prefix + '/include/ImageMagick',
    prefix + '/bin/Magick-config'
  ].map do |file_glob|
    Dir.glob(file_glob)
  end
  matches.delete_if(&:empty?)
  return unless !matches.empty? && matches.length < 3

  msg = "\nWarning: Found a partial ImageMagick installation. Your operating system likely has some built-in ImageMagick libraries but not all of ImageMagick. This will most likely cause problems at both compile and runtime.\nFound partial installation at: " + prefix + "\n"
  Logging.message msg
  message msg
end

#configure_compile_options ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 50

def configure_compile_options
  # Magick-config is not available on Windows
  if RUBY_PLATFORM !~ /mswin|mingw/

    # Check for compiler. Extract first word so ENV['CC'] can be a program name with arguments.
    config = defined?(RbConfig) ? ::RbConfig : ::Config
    cc = (ENV['CC'] || config::CONFIG['CC'] || 'gcc').split(' ').first
    exit_failure "No C compiler found in ${ENV['PATH']}. See mkmf.log for details." unless find_executable(cc)

    # ugly way to handle which config tool we're going to use...
    $with_magick_wand = false
    $magick_config = false
    $pkg_config = false

    # Check for Magick-config
    if find_executable('Magick-config') && !has_graphicsmagick_libmagick_dev_compat?
      $magick_config = true
      $magick_version = `Magick-config --version`[/^(\d+\.\d+\.\d+)/]
    elsif find_executable('pkg-config')
      $pkg_config = true
      $magick_version = `pkg-config MagickCore --modversion`[/^(\d+\.\d+\.\d+)/]
    else
      exit_failure "Can't install RMagick #{RMAGICK_VERS}. Can't find Magick-config or pkg-config in #{ENV['PATH']}\n"
    end

    check_multiple_imagemagick_versions
    check_partial_imagemagick_versions

    # Ensure minimum ImageMagick version
    # Check minimum ImageMagick version if possible
    checking_for("outdated ImageMagick version (<= #{Magick::MIN_IM_VERSION})") do
      Logging.message("Detected ImageMagick version: #{$magick_version}\n")

      exit_failure "Can't install RMagick #{RMAGICK_VERS}. You must have ImageMagick #{Magick::MIN_IM_VERSION} or later.\n" if Gem::Version.new($magick_version) < Gem::Version.new(Magick::MIN_IM_VERSION)
    end

    # From ImageMagick 6.9 binaries are split to two and we have to use
    # MagickWand instead of MagickCore
    checking_for("presence of MagickWand API (ImageMagick version >= #{Magick::MIN_WAND_VERSION})") do
      $with_magick_wand = Gem::Version.new($magick_version) >= Gem::Version.new(Magick::MIN_WAND_VERSION)
      if $with_magick_wand
        Logging.message('Detected 6.9+ version, using MagickWand API')
      else
        Logging.message('Older version detected, using MagickCore API')
      end
    end

    # either set flags using Magick-config, MagickWand-config or pkg-config (new Debian default)
    if $with_magick_wand
      if $magick_config
        # Save flags
        $CFLAGS = ENV['CFLAGS'].to_s + ' ' + `MagickWand-config --cflags`.chomp
        $CPPFLAGS = ENV['CPPFLAGS'].to_s + ' ' + `MagickWand-config --cppflags`.chomp
        $LDFLAGS = ENV['LDFLAGS'].to_s + ' ' + `MagickWand-config --ldflags`.chomp
        $LOCAL_LIBS = ENV['LIBS'].to_s + ' ' + `MagickWand-config --libs`.chomp
      end

      if $pkg_config
        # Save flags
        $CFLAGS = ENV['CFLAGS'].to_s + ' ' + `pkg-config --cflags MagickWand`.chomp
        $CPPFLAGS = ENV['CPPFLAGS'].to_s + ' ' + `pkg-config --cflags MagickWand`.chomp
        $LDFLAGS = ENV['LDFLAGS'].to_s + ' ' + `pkg-config --libs MagickWand`.chomp
        $LOCAL_LIBS = ENV['LIBS'].to_s + ' ' + `pkg-config --libs MagickWand`.chomp
      end
    else
      if $magick_config
        # Save flags
        $CFLAGS = ENV['CFLAGS'].to_s + ' ' + `Magick-config --cflags`.chomp
        $CPPFLAGS = ENV['CPPFLAGS'].to_s + ' ' + `Magick-config --cppflags`.chomp
        $LDFLAGS = ENV['LDFLAGS'].to_s + ' ' + `Magick-config --ldflags`.chomp
        $LOCAL_LIBS = ENV['LIBS'].to_s + ' ' + `Magick-config --libs`.chomp
      end

      if $pkg_config
        # Save flags
        $CFLAGS = ENV['CFLAGS'].to_s + ' ' + `pkg-config --cflags MagickCore`.chomp
        $CPPFLAGS = ENV['CPPFLAGS'].to_s + ' ' + `pkg-config --cflags MagickCore`.chomp
        $LDFLAGS = ENV['LDFLAGS'].to_s + ' ' + `pkg-config --libs MagickCore`.chomp
        $LOCAL_LIBS = ENV['LIBS'].to_s + ' ' + `pkg-config --libs MagickCore`.chomp
      end
    end

    set_archflags_for_osx if RUBY_PLATFORM =~ /darwin/ # osx

  elsif RUBY_PLATFORM =~ /mingw/ # mingw

    `identify -version` =~ /Version: ImageMagick (\d+\.\d+\.\d+)-+\d+ /
    abort 'Unable to get ImageMagick version' unless Regexp.last_match(1)
    $magick_version = Regexp.last_match(1)
    search_paths_for_library_for_mingw unless have_library('CORE_RL_magick_')
    have_library('X11')

  else # mswin

    `identify -version` =~ /Version: ImageMagick (\d+\.\d+\.\d+)-+\d+ /
    abort 'Unable to get ImageMagick version' unless Regexp.last_match(1)
    $magick_version = Regexp.last_match(1)
    $CFLAGS = '-W3'
    $CPPFLAGS = %(-I"C:\\Program Files\\Microsoft Platform SDK for Windows Server 2003 R2\\Include" -I"C:\\Program Files\\ImageMagick-#{$magick_version}-Q8\\include")
    # The /link option is required by the Makefile but causes warnings in the mkmf.log file.
    $LDFLAGS = %(/link /LIBPATH:"C:\\Program Files\\Microsoft Platform SDK for Windows Server 2003 R2\\Lib" /LIBPATH:"C:\\Program Files\\ImageMagick-#{$magick_version}-Q8\\lib" /LIBPATH:"C:\\ruby\\lib")
    $LOCAL_LIBS = 'CORE_RL_magick_.lib'
    have_library('X11')

  end
end

#configure_headers ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 37

def configure_headers
  # headers = %w{assert.h ctype.h errno.h float.h limits.h math.h stdarg.h stddef.h stdint.h stdio.h stdlib.h string.h time.h}
  @headers = %w[assert.h ctype.h stdio.h stdlib.h math.h time.h]
  headers << 'stdint.h' if have_header('stdint.h') # defines uint64_t
  headers << 'sys/types.h' if have_header('sys/types.h')

  if have_header('wand/MagickWand.h')
    headers << 'wand/MagickWand.h'
  else
    exit_failure "\nCan't install RMagick #{RMAGICK_VERS}. Can't find MagickWand.h."
  end
end

#configured_compile_options ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 22

def configured_compile_options
  {
    magick_config: $magick_config,
    with_magick_wand: $with_magick_wand,
    pkg_config: $pkg_config,
    magick_version: $magick_version,
    local_libs: $LOCAL_LIBS,
    cflags: $CFLAGS,
    cppflags: $CPPFLAGS,
    ldflags: $LDFLAGS,
    defs: $defs,
    config_h: $config_h
  }
end

#create_header_file ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 336

def create_header_file
  have_func('snprintf', headers)
  ['AcquireImage', # 6.4.1
   'AffinityImage', # 6.4.3-6
   'AffinityImages', # 6.4.3-6
   'AutoGammaImageChannel', # 6.5.5-1
   'AutoLevelImageChannel', # 6.5.5-1
   'BlueShiftImage', # 6.5.4-3
   'ColorMatrixImage', # 6.6.1-0
   'ConstituteComponentTerminus', # 6.5.7-9
   'DeskewImage', # 6.4.2-5
   'DestroyConstitute', # 6.5.7-9(deprecated)
   'EncipherImage', # 6.3.8-6
   'EqualizeImageChannel', # 6.3.6-9
   'EvaluateImages', # 6.8.6-4
   'FloodfillPaintImage', # 6.3.7
   'FunctionImageChannel', # 6.4.8-8
   'GetAuthenticIndexQueue', # 6.4.5-6
   'GetAuthenticPixels', # 6.4.5-6
   'GetImageAlphaChannel', # 6.3.9-2
   'GetImageChannelEntropy', # 6.9.0-0
   'GetMagickFeatures', # 6.5.7-1
   'GetVirtualPixels', # 6.4.5-6
   'LevelImageColors', # 6.4.2
   'LevelColorsImageChannel', # 6.5.6-4
   'LevelizeImageChannel', # 6.4.2
   'LiquidRescaleImage', # 6.3.8-2
   'MagickLibAddendum', # 6.5.9-1
   'OpaquePaintImageChannel', # 6.3.7-10
   'QueueAuthenticPixels', # 6.4.5-6
   'RemapImage', # 6.4.4-0
   'RemapImages', # 6.4.4-0
   'RemoveImageArtifact', # 6.3.6
   'RotationalBlurImage', # 6.8.8-9
   'RotationalBlurImageChannel', # 6.8.8-9
   'SelectiveBlurImageChannel', # 6.5.0-3
   'SetImageAlphaChannel', # 6.3.6-9
   'SetImageArtifact', # 6.3.6
   'SetMagickMemoryMethods', # 6.4.1
   'SparseColorImage', # 6.3.6-?
   'StatisticImage', # 6.6.8-6
   'SyncAuthenticPixels', # 6.4.5-6
   'TransformImageColorspace', # 6.5.1
   'TransparentPaintImage', # 6.3.7-10
   'TransparentPaintImageChroma' # 6.4.5-6
  ].each do |func|
    have_func(func, headers)
  end

  checking_for('QueryMagickColorname() new signature') do
    if try_compile("\#{COMMON_HEADERS}\n    \#{cpp_include(headers)}\n/*top*/\nint main() {\n  MagickBooleanType okay;\n  Image *image;\n  MagickPixelPacket *color;\n  char *name;\n  ExceptionInfo *exception;\n  okay = QueryMagickColorname(image, color, SVGCompliance, name, exception);\n  return 0;\n  }\n")
      $defs.push('-DHAVE_NEW_QUERYMAGICKCOLORNAME')
      true
    else
      false
    end
  end

  have_struct_member('Image', 'type', headers) # ???
  have_struct_member('DrawInfo', 'kerning', headers) # 6.4.7-8
  have_struct_member('DrawInfo', 'interline_spacing', headers) # 6.5.5-8
  have_struct_member('DrawInfo', 'interword_spacing', headers) # 6.4.8-0
  have_type('DitherMethod', headers) # 6.4.2
  have_type('MagickFunction', headers) # 6.4.8-8
  have_type('ImageLayerMethod', headers) # 6.3.6 replaces MagickLayerMethod
  have_type('long double', headers)
  # have_type("unsigned long long", headers)
  # have_type("uint64_t", headers)
  # have_type("__int64", headers)
  # have_type("uintmax_t", headers)
  # check_sizeof("unsigned long", headers)
  # check_sizeof("Image *", headers)

  have_enum_values('AlphaChannelType', ['CopyAlphaChannel', # 6.4.3-7
                                        'BackgroundAlphaChannel', # 6.5.2-5
                                        'RemoveAlphaChannel'], headers) # 6.7.5-1
  have_enum_values('CompositeOperator', ['BlurCompositeOp', # 6.5.3-7
                                         'DistortCompositeOp', # 6.5.3-10
                                         'LinearBurnCompositeOp', # 6.5.4-3
                                         'LinearDodgeCompositeOp', # 6.5.4-3
                                         'MathematicsCompositeOp', # 6.5.4-3
                                         'PegtopLightCompositeOp', # 6.5.4-3
                                         'PinLightCompositeOp', # 6.5.4-3
                                         'VividLightCompositeOp'], headers) # 6.5.4-3
  have_enum_values('CompressionType', ['DXT1Compression', # 6.3.9-3
                                       'DXT3Compression', # 6.3.9-3
                                       'DXT5Compression', # 6.3.9-3
                                       'ZipSCompression', # 6.5.5-4
                                       'PizCompression', # 6.5.5-4
                                       'Pxr24Compression', # 6.5.5-4
                                       'B44Compression', # 6.5.5-4
                                       'B44ACompression'], headers) # 6.5.5-4

  have_enum_values('DistortImageMethod', ['BarrelDistortion', # 6.4.2-5
                                          'BarrelInverseDistortion', # 6.4.3-8
                                          'BilinearForwardDistortion', # 6.5.1-2
                                          'BilinearReverseDistortion', # 6.5.1-2
                                          'DePolarDistortion', # 6.4.2-6
                                          'PolarDistortion', # 6.4.2-6
                                          'PolynomialDistortion', # 6.4.2-4
                                          'ShepardsDistortion'], headers) # 6.4.2-4
  have_enum_value('DitherMethod', 'NoDitherMethod', headers) # 6.4.3
  have_enum_values('FilterTypes', ['KaiserFilter', # 6.3.6
                                   'WelshFilter', # 6.3.6-4
                                   'ParzenFilter', # 6.3.6-4
                                   'LagrangeFilter', # 6.3.7-2
                                   'BohmanFilter', # 6.3.7-2
                                   'BartlettFilter', # 6.3.7-2
                                   'SentinelFilter'], headers) # 6.3.7-2
  have_enum_values('MagickEvaluateOperator', ['PowEvaluateOperator', # 6.4.1-9
                                              'LogEvaluateOperator', # 6.4.2
                                              'ThresholdEvaluateOperator', # 6.4.3
                                              'ThresholdBlackEvaluateOperator', # 6.4.3
                                              'ThresholdWhiteEvaluateOperator', # 6.4.3
                                              'GaussianNoiseEvaluateOperator', # 6.4.3
                                              'ImpulseNoiseEvaluateOperator', # 6.4.3
                                              'LaplacianNoiseEvaluateOperator', # 6.4.3
                                              'MultiplicativeNoiseEvaluateOperator', # 6.4.3
                                              'PoissonNoiseEvaluateOperator', # 6.4.3
                                              'UniformNoiseEvaluateOperator', # 6.4.3
                                              'CosineEvaluateOperator', # 6.4.8-5
                                              'SineEvaluateOperator', # 6.4.8-5
                                              'AddModulusEvaluateOperator'], # 6.4.8-5
                   headers)
  have_enum_values('MagickFunction', ['ArcsinFunction', # 6.5.2-8
                                      'ArctanFunction', # 6.5.2-8
                                      'PolynomialFunction', # 6.4.8-8
                                      'SinusoidFunction'], headers) # 6.4.8-8
  have_enum_values('ImageLayerMethod', ['FlattenLayer', # 6.3.6-2
                                        'MergeLayer', # 6.3.6
                                        'MosaicLayer', # 6.3.6-2
                                        'TrimBoundsLayer'], headers) # 6.4.3-8
  have_enum_values('VirtualPixelMethod', ['HorizontalTileVirtualPixelMethod', # 6.4.2-6
                                          'VerticalTileVirtualPixelMethod', # 6.4.2-6
                                          'HorizontalTileEdgeVirtualPixelMethod', # 6.5.0-1
                                          'VerticalTileEdgeVirtualPixelMethod', # 6.5.0-1
                                          'CheckerTileVirtualPixelMethod'], # 6.5.0-1
                   headers)

  headers = ['ruby.h', 'ruby/io.h']

  have_func('rb_frame_this_func', headers)

  # Miscellaneous constants
  $defs.push("-DRUBY_VERSION_STRING=\"ruby #{RUBY_VERSION}\"")
  $defs.push("-DRMAGICK_VERSION_STRING=\"RMagick #{RMAGICK_VERS}\"")

  create_header
end

#create_makefile_file ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 499

def create_makefile_file
  create_header_file
  # Prior to 1.8.5 mkmf duplicated the symbols on the command line and in the
  # extconf.h header. Suppress that behavior by removing the symbol array.
  $defs = []

  # Force re-compilation if the generated Makefile changed.
  $config_h = 'Makefile rmagick.h'

  create_makefile('RMagick2')
  print_summary
end

#exit_failure(msg) ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 195

def exit_failure(msg)
  Logging.message msg
  message msg + "\n"
  exit(1)
end

#has_graphicsmagick_libmagick_dev_compat? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/RMagick/extconf.rb', line 181

def has_graphicsmagick_libmagick_dev_compat?
  config_path = `which Magick-config`.chomp
  if File.exist?(config_path) &&
     File.symlink?(config_path) &&
     File.readlink(config_path) =~ /GraphicsMagick/
    msg = 'Found a graphicsmagick-libmagick-dev-compat installation.'
    Logging.message msg
    message msg + "\n"
    true
  else
    false
  end
end

#have_enum_value(enum, value, headers = nil, &b) ⇒ Object

Test for a specific value in an enum type



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# File 'ext/RMagick/extconf.rb', line 158

def have_enum_value(enum, value, headers = nil, &b)
  checking_for "#{enum}.#{value}" do
    if try_compile("\#{COMMON_HEADERS}\n    \#{cpp_include(headers)}\n/*top*/\nint main() { \#{enum} t = \#{value}; t = t; return 0; }\n", &b)
      $defs.push(format('-DHAVE_ENUM_%s', value.upcase))
      true
    else
      false
    end
  end
end

#have_enum_values(enum, values, headers = nil, &b) ⇒ Object

Test for multiple values of the same enum type



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# File 'ext/RMagick/extconf.rb', line 175

def have_enum_values(enum, values, headers = nil, &b)
  values.each do |value|
    have_enum_value(enum, value, headers, &b)
  end
end

#print_summary ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 512

def print_summary
  summary = "\n\n\#{'=' * 70}\n  \#{DateTime.now.strftime('%a %d%b%y %T')}\nThis installation of RMagick \#{RMAGICK_VERS} is configured for\nRuby \#{RUBY_VERSION} (\#{RUBY_PLATFORM}) and ImageMagick \#{$magick_version}\n  \#{'=' * 70}\n\n\n"

  Logging.message summary
  message summary
end

#search_paths_for_library_for_mingw ⇒ Object 



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# File 'ext/RMagick/extconf.rb', line 263

def search_paths_for_library_for_mingw
  msg = 'searching PATH for the ImageMagick library...'
  Logging.message msg
  message msg + "\n"

  found_lib = false

  paths = ENV['PATH'].split(File::PATH_SEPARATOR)
  paths.each do |dir|
    lib = File.join(dir, 'lib')
    lib_file = File.join(lib, 'CORE_RL_magick_.lib')
    next unless File.exist?(lib_file)

    $CPPFLAGS = %(-I"#{File.join(dir, 'include')}")
    $LDFLAGS = %(-L"#{lib}")
    found_lib = have_library('CORE_RL_magick_')
    break if found_lib
  end

  return if found_lib

  exit_failure "Can't install RMagick \#{RMAGICK_VERS}.\nCan't find the ImageMagick library.\nRetry with '--with-opt-dir' option.\nUsage: gem install rmagick -- '--with-opt-dir=\\\"[path to ImageMagick]\\\"'\ne.g.\n  gem install rmagick -- '--with-opt-dir=\\\"C:\\Program Files\\ImageMagick-6.9.1-Q16\\\"'\n"
end

#set_archflags_for_osx ⇒ Object

issue #169 set ARCHFLAGS appropriately for OSX



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# File 'ext/RMagick/extconf.rb', line 248

def set_archflags_for_osx
  archflags = []
  fullpath = `which convert`
  fileinfo = `file #{fullpath}`

  # default ARCHFLAGS
  archs = $ARCH_FLAG.scan(/-arch\s+(\S+)/).flatten

  archs.each do |arch|
    archflags << "-arch #{arch}" if fileinfo.include?(arch)
  end

  $ARCH_FLAG = archflags.join(' ') unless archflags.empty?
end