Backport of Bug#53303 mytap tests should always have a plan()

The bug was caused by buffered output. Flushing resolved it.
We still recommend to allways call plan().
  
Also fix some compile warnings (formal parameter different from declaration)


unittest/examples/Makefile.am:
  Omit core-t, since it will always fail.
unittest/examples/no_plan-t.c:
  Comment that we recommend calling plan(NO_PLAN)
unittest/mytap/tap.c:
  Use the named constant NO_PLAN
  Flush all output.
unittest/mytap/tap.h:
  Change documentation for the plan() function.

1 files changed, 6 insertions, 7 deletions

diff --git a/unittest/mytap/tap.h b/unittest/mytap/tap.h
index 31ec47d1ef2..4118207ca7a 100644
--- a/unittest/mytap/tap.h
+++ b/unittest/mytap/tap.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2006 MySQL AB
+/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved. 
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -72,10 +72,9 @@ extern "C" {
 /**
    Set number of tests that is planned to execute.
 
-   The function also accepts the predefined constant
-   <code>NO_PLAN</code>.  If the function is not called, it is as if
-   it was called with <code>NO_PLAN</code>, i.e., the test plan will
-   be printed after all the test lines.
+   The function also accepts the predefined constant <code>NO_PLAN</code>.
+   If invoked with this constant -- or not invoked at all --
+   the test plan will be printed after all the test lines.
 
    The plan() function will install signal handlers for all signals
    that generate a core, so if you want to override these signals, do
@@ -84,7 +83,7 @@ extern "C" {
    @param count The planned number of tests to run. 
 */
 
-void plan(int count);
+void plan(int const count);
 
 
 /**
@@ -103,7 +102,7 @@ void plan(int count);
                which case nothing is printed.
 */
 
-void ok(int pass, char const *fmt, ...)
+void ok(int const pass, char const *fmt, ...)
   __attribute__((format(printf,2,3)));