int (*)(void) is incompatible with void*

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61544 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/mkmf.rb

@@ -2584,7 +2584,8 @@ MESSAGE
       src = src.sub(/\{/) do
         $& +
           "\n  if (argc > 1000000) {\n" +
-          refs.map {|n|"    printf(\"%p\", &#{n});\n"}.join("") +
+          refs.map {|n|"    int (* volatile #{n}p)(void)=(int (*)(void))&#{n};\n"}.join("") +
+          refs.map {|n|"    printf(\"%d\", (*#{n}p)());\n"}.join("") +
           "  }\n"
       end
     end