DIABLE_STDIO to disable __printstr__

src/init.c

@@ -43,6 +43,7 @@ mrb_init_core(mrb_state *mrb)
   mrb_init_enumerable(mrb);
 
   mrb_init_symbol(mrb);
+  mrb_init_exception(mrb);
   mrb_init_proc(mrb);
   mrb_init_string(mrb);
   mrb_init_array(mrb);
@@ -56,8 +57,9 @@ mrb_init_core(mrb_state *mrb)
 #ifdef ENABLE_REGEXP
   mrb_init_regexp(mrb);
 #endif
-  mrb_init_exception(mrb);
+#ifdef ENABLE_STDIO
   mrb_init_print(mrb);
+#endif
 #ifdef ENABLE_TIME
   mrb_init_time(mrb);
 #endif

src/print.c

@@ -5,10 +5,11 @@
 */
 
 #include "mruby.h"
+#ifdef ENABLE_STDIO
 #include "mruby/string.h"
 #include <stdio.h>
 
-mrb_value
+static void
 printstr(mrb_state *mrb, mrb_value obj)
 {
   struct RString *str;
@@ -24,7 +25,6 @@ printstr(mrb_state *mrb, mrb_value obj)
       s++;
     }
   }
-  return obj;
 }
 
 mrb_value
@@ -71,3 +71,14 @@ mrb_show_copyright(mrb_state *mrb)
 {
   printf("mruby - Copyright (c) 2010-2012 mruby developers\n");
 }
+#else
+void
+mrb_show_version(mrb_state *mrb)
+{
+}
+
+void
+mrb_show_copyright(mrb_state *mrb)
+{
+}
+#endif