common.mk: ifchange for mkconfig.rb

* common.mk (RBCONFIG): use ifchange tool to see if the content is
  changed and update the timestamp file.
* tool/mkconfig.rb: remove ifchange features.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55338 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,4 +1,9 @@
-Thu Jun  9 15:31:52 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Jun  9 15:32:17 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* common.mk (RBCONFIG): use ifchange tool to see if the content is
+	  changed and update the timestamp file.
+
+	* tool/mkconfig.rb: remove ifchange features.
 
 	* tool/ifchange: make target directory if it does not exist with
 	  its parent directories.

common.mk

@@ -624,11 +624,12 @@ extconf: $(PREP)
 	$(RUNRUBY) -C "$(EXTCONFDIR)" $(EXTCONF) $(EXTCONFARGS)
 
 $(RBCONFIG): $(srcdir)/tool/mkconfig.rb config.status $(srcdir)/version.h
-	$(Q)$(BOOTSTRAPRUBY) $(srcdir)/tool/mkconfig.rb -timestamp=$@ \
+	$(Q)$(BOOTSTRAPRUBY) $(srcdir)/tool/mkconfig.rb \
 		-cross_compiling=$(CROSS_COMPILING) \
 		-arch=$(arch) -version=$(RUBY_PROGRAM_VERSION) \
 		-install_name=$(RUBY_INSTALL_NAME) \
-		-so_name=$(RUBY_SO_NAME) rbconfig.rb
+		-so_name=$(RUBY_SO_NAME) | \
+	$(srcdir)/tool/ifchange --timestamp=$@ rbconfig.rb -
 
 test-rubyspec-precheck:
 

tool/mkconfig.rb

@@ -19,17 +19,6 @@ $:.unshift(".")
 require "fileutils"
 mkconfig = File.basename($0)
 
-rbconfig_rb = ARGV[0] || 'rbconfig.rb'
-unless File.directory?(dir = File.dirname(rbconfig_rb))
-  FileUtils.makedirs(dir, :verbose => true)
-end
-
-config = ""
-def config.write(arg)
-  concat(arg.to_s)
-end
-$stdout = config
-
 fast = {'prefix'=>TRUE, 'ruby_install_name'=>TRUE, 'INSTALL'=>TRUE, 'EXEEXT'=>TRUE}
 
 win32 = /mswin/ =~ arch
@@ -287,21 +276,4 @@ end
 CROSS_COMPILING = nil unless defined? CROSS_COMPILING
 EOS
 
-$stdout = STDOUT
-mode = IO::RDWR|IO::CREAT
-mode |= IO::BINARY if defined?(IO::BINARY)
-open(rbconfig_rb, mode) do |f|
-  if $timestamp and f.stat.size == config.size and f.read == config
-    puts "#{rbconfig_rb} unchanged"
-  else
-    puts "#{rbconfig_rb} updated"
-    f.rewind
-    f.truncate(0)
-    f.print(config)
-  end
-end
-if String === $timestamp
-  FileUtils.touch($timestamp)
-end
-
 # vi:set sw=2: