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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.
#++

class Gem::Ext::ExtConfBuilder < Gem::Ext::Builder
  def self.build(extension, dest_path, results, args=[], lib_dir=nil, extension_dir=Dir.pwd)
    require 'fileutils'
    require 'tempfile'

tmp_dest = Dir.mktmpdir(".gem.", extension_dir)

# 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
    tmp_dest_relative = get_relative_path(tmp_dest.clone, extension_dir)

Tempfile.open %w[siteconf .rb], extension_dir do |siteconf|
      siteconf.puts "require 'rbconfig'"
      siteconf.puts "dest_path = #{tmp_dest_relative.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
        # workaround for https://github.com/oracle/truffleruby/issues/2115
        siteconf_path = RUBY_ENGINE == "truffleruby" ? siteconf.path.dup : siteconf.path
        require "shellwords"
        cmd = Gem.ruby.shellsplit << "-I" << File.expand_path("../../..", __FILE__) <<
              "-r" << get_relative_path(siteconf_path, extension_dir) << File.basename(extension)
        cmd.push(*args)

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

ENV["DESTDIR"] = nil

make dest_path, results, extension_dir

if tmp_dest_relative
          full_tmp_dest = File.join(extension_dir, tmp_dest_relative)

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

FileUtils::Entry_.new(full_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, base)
    path[0..base.length - 1] = '.' if path.start_with?(base)
    path
  end
end

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