* lib/mkmf.rb (try_func): ignore empty opts.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33697 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/mkmf.rb

@@ -625,14 +625,17 @@ def try_func(func, libs, headers = nil, opt = "", &b)
 	break opt = opt.send(meth, *args)
       end
     end
+    opt = "#{opt} #{libs}"
+  else
+    opt = libs
   end
-  try_link(<<"SRC", "#{opt} #{libs}", &b) or
+  try_link(<<"SRC", opt, &b) or
 #{headers}
 /*top*/
 #{MAIN_DOES_NOTHING}
 int t() { #{decltype["volatile p"]}; p = (#{decltype[]})#{func}; return 0; }
 SRC
-  call && try_link(<<"SRC", "#{opt} #{libs}", &b)
+  call && try_link(<<"SRC", opt, &b)
 #{headers}
 /*top*/
 #{MAIN_DOES_NOTHING}