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✏️ Editing: ext_conf_builder.rb

# frozen_string_literal: true
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require 'fileutils'
require 'tempfile'

class Gem::Ext::ExtConfBuilder < Gem::Ext::Builder
  FileEntry = FileUtils::Entry_ # :nodoc:

def self.build(extension, directory, dest_path, results, args=[], lib_dir=nil)
    tmp_dest = Dir.mktmpdir(".gem.", ".")

# Some versions of `mktmpdir` return absolute paths, which will break make
    # if the paths contain spaces. However, on Ruby 1.9.x on Windows, relative
    # paths cause all C extension builds to fail.
    #
    # As such, we convert to a relative path unless we are using Ruby 1.9.x on
    # Windows. This means that when using Ruby 1.9.x on Windows, paths with
    # spaces do not work.
    #
    # Details: https://github.com/rubygems/rubygems/issues/977#issuecomment-171544940
    #
    # TODO: Make this unconditional when rubygems no longer supports Ruby 1.9.x.
    tmp_dest = get_relative_path(tmp_dest) unless Gem.win_platform? && RUBY_VERSION <= '2.0'

Tempfile.open %w"siteconf .rb", "." do |siteconf|
      siteconf.puts "require 'rbconfig'"
      siteconf.puts "dest_path = #{tmp_dest.dump}"
      %w[sitearchdir sitelibdir].each do |dir|
        siteconf.puts "RbConfig::MAKEFILE_CONFIG['#{dir}'] = dest_path"
        siteconf.puts "RbConfig::CONFIG['#{dir}'] = dest_path"
      end

siteconf.close

destdir = ENV["DESTDIR"]

begin
        cmd = [Gem.ruby, "-r", get_relative_path(siteconf.path), File.basename(extension), *args].join ' '

begin
          run cmd, results
        ensure
          if File.exist? 'mkmf.log'
            unless $?.success? then
              results << "To see why this extension failed to compile, please check" \
                " the mkmf.log which can be found here:\n"
              results << "  " + File.join(dest_path, 'mkmf.log') + "\n"
            end
            FileUtils.mv 'mkmf.log', dest_path
          end
          siteconf.unlink
        end

ENV["DESTDIR"] = nil

make dest_path, results

if tmp_dest
          # TODO remove in RubyGems 3
          if Gem.install_extension_in_lib and lib_dir then
            FileUtils.mkdir_p lib_dir
            entries = Dir.entries(tmp_dest) - %w[. ..]
            entries = entries.map { |entry| File.join tmp_dest, entry }
            FileUtils.cp_r entries, lib_dir, :remove_destination => true
          end

FileEntry.new(tmp_dest).traverse do |ent|
            destent = ent.class.new(dest_path, ent.rel)
            destent.exist? or FileUtils.mv(ent.path, destent.path)
          end
        end
      ensure
        ENV["DESTDIR"] = destdir
        siteconf.close!
      end
    end

results
  ensure
    FileUtils.rm_rf tmp_dest if tmp_dest
  end

private
  def self.get_relative_path(path)
    path[0..Dir.pwd.length-1] = '.' if path.start_with?(Dir.pwd)
    path
  end

end

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