mkmf.rb: move r40537

* lib/mkmf.rb (create_makefile): move r40537 from extmk.rb.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51756 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/extmk.rb

@@ -244,14 +244,7 @@ def extmake(target)
     end
     ok &&= File.open(makefile){|f| s = f.gets and !s[DUMMY_SIGNATURE]}
     ok = yield(ok) if block_given?
-    if ok
+    unless ok
-      open(makefile, "r+b") do |f|
-        s = f.read.sub!(/^(static:)\s(?!all\b).*/, '\1 all') or break
-        f.rewind
-        f.print(s)
-        f.truncate(f.pos)
-      end unless $static
-    else
       atomic_write_open(makefile) do |f|
         f.puts "# " + DUMMY_SIGNATURE
 	f.print(*dummy_makefile(CONFIG["srcdir"]))

lib/mkmf.rb

@@ -2296,7 +2296,7 @@ CLEANLIBS     = #{n}.#{CONFIG['DLEXT']} #{config_string('cleanlibs') {|t| t.gsub
 CLEANOBJS     = *.#{$OBJEXT} #{config_string('cleanobjs') {|t| t.gsub(/\$\*/, "$(TARGET)#{deffile ? '-$(arch)': ''}")} if target} *.bak
 
 all:    #{$extout ? "install" : target ? "$(DLLIB)" : "Makefile"}
-static: $(STATIC_LIB)#{$extout ? " install-rb" : ""}
+static: #{$extmk && !$static ? "all" : "$(STATIC_LIB)#{!$extmk ? " install-rb" : ""}"}
 .PHONY: all install static install-so install-rb
 .PHONY: clean clean-so clean-static clean-rb
 "