Methods
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Included Modules
Constants
CHDIR_MUTEX = Mutex.new # :nodoc:
 

The builder shells-out to run various commands after changing the directory. This means multiple installations cannot be allowed to build extensions in parallel as they may change each other's directories leading to broken extensions or failed installations.
Class Public methods
class_name()

Source: show | on GitHub 

# File lib/rubygems/ext/builder.rb, line 25
def self.class_name
  name =~ /Ext::(.*)Builder/
  $1.downcase
end
make(dest_path, results)

Source: show | on GitHub 

# File lib/rubygems/ext/builder.rb, line 30
def self.make(dest_path, results)
  unless File.exist? 'Makefile' then
    raise Gem::InstallError, 'Makefile not found'
  end

  # try to find make program from Ruby configure arguments first
  RbConfig::CONFIG['configure_args'] =~ /with-make-prog\=(\w+)/
  make_program = ENV['MAKE'] || ENV['make'] || $1
  unless make_program then
    make_program = (/mswin/ =~ RUBY_PLATFORM) ? 'nmake' : 'make'
  end

  destdir = '"DESTDIR=%s"' % ENV['DESTDIR'] if RUBY_VERSION > '2.0'

  ['clean', '', 'install'].each do |target|
    # Pass DESTDIR via command line to override what's in MAKEFLAGS
    cmd = [
      make_program,
      destdir,
      target
    ].join(' ').rstrip
    begin
      run(cmd, results, "make #{target}".rstrip)
    rescue Gem::InstallError
      raise unless target == 'clean' # ignore clean failure
    end
  end
end
new(spec, build_args = spec.build_args)

Creates a new extension builder for spec. If the spec does not yet have build arguments, saved, set build_args which is an ARGV-style array.

Source: show | on GitHub 

# File lib/rubygems/ext/builder.rb, line 101
def initialize spec, build_args = spec.build_args
  @spec       = spec
  @build_args = build_args
  @gem_dir    = spec.full_gem_path

  @ran_rake   = nil
end
redirector()

Source: show | on GitHub 

# File lib/rubygems/ext/builder.rb, line 59
def self.redirector
  '2>&1'
end
run(command, results, command_name = nil)

Source: show | on GitHub 

# File lib/rubygems/ext/builder.rb, line 63
def self.run(command, results, command_name = nil)
  verbose = Gem.configuration.really_verbose

  begin
    # TODO use Process.spawn when ruby 1.8 support is dropped.
    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], nil
    if verbose
      puts("current directory: #{Dir.pwd}")
      puts(command)
      system(command)
    else
      results << "current directory: #{Dir.pwd}"
      results << command
      results << %x`#{command} #{redirector}`
    end
  ensure
    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
  end

  unless $?.success? then
    results << "Building has failed. See above output for more information on the failure." if verbose

    exit_reason =
      if $?.exited? then
        ", exit code #{$?.exitstatus}"
      elsif $?.signaled? then
        ", uncaught signal #{$?.termsig}"
      end

    raise Gem::InstallError, "#{command_name || class_name} failed#{exit_reason}"
  end
end
Instance Public methods
build_extensions()

Builds extensions. Valid types of extensions are extconf.rb files, configure scripts and rakefiles or mkrf_conf files.

Source: show | on GitHub 

# File lib/rubygems/ext/builder.rb, line 182
def build_extensions
  return if @spec.extensions.empty?

  if @build_args.empty?
    say "Building native extensions.  This could take a while..."
  else
    say "Building native extensions with: '#{@build_args.join ' '}'"
    say "This could take a while..."
  end

  dest_path = @spec.extension_dir

  FileUtils.rm_f @spec.gem_build_complete_path

  @ran_rake = false # only run rake once

  @spec.extensions.each do |extension|
    break if @ran_rake

    build_extension extension, dest_path
  end

  FileUtils.touch @spec.gem_build_complete_path
end