expand-config.rb: expand config values

* tool/expand-config.rb: expand config values, extracted from
  win32/Makefile.sub.

* win32/Makefile.sub (ruby_pc): use tool/expand-config.rb script.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44448 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/expand-config.rb

@@ -0,0 +1,7 @@
+STDOUT.binmode
+ARGF.each do |line|
+  line.gsub!(/@([a-z_]\w*)@/i) {
+    (RbConfig::MAKEFILE_CONFIG[$1] or "").gsub(/\$\((.+?)\)/, %Q[${\\1}])
+  }
+  puts line
+end

win32/Makefile.sub

@@ -1053,11 +1053,7 @@ end
 <<KEEP
 
 $(ruby_pc): $(RBCONFIG)
-	@$(MINIRUBY) -r./rbconfig -p \
-	-e 'STDOUT.binmode' \
-	-e '$$_.gsub!(/@([a-z_]\w*)@/i) {' \
-	-e '(RbConfig::MAKEFILE_CONFIG[$$1] or "").gsub(/\$$\((.+?)\)/, %Q[$${\\1}])' \
-	-e '}' \
+	@$(MINIRUBY) -r./rbconfig $(srcdir)/tool/expand-config.rb \
 	$(srcdir)/template/ruby.pc.in > $@
 
 {$(srcdir)/enc}.c.obj: