Accept attributes after labels

newer GCC can associate attributes with statements and labels,
this implements only the latter (and ignores the attributes).

tccgen.c

@@ -7048,6 +7048,11 @@ again:
             s->cleanupstate = cur_scope->cl.s;
 
     block_after_label:
+              {
+                /* Accept attributes after labels (e.g. 'unused') */
+                AttributeDef ad_tmp;
+                parse_attribute(&ad_tmp);
+              }
             vla_restore(cur_scope->vla.loc);
             if (tok != '}')
                 goto again;

tests/tests2/82_attribs_position.c

@@ -30,6 +30,12 @@ int ATTR actual_function() {
   return 42;
 }
 
+int label_attribute (void)
+{
+lab1: __attribute__((__unused__));
+  return 0;
+}
+
 extern int printf (const char *, ...);
 static int globalvar;
 int main()