Added DBUG_ASSERT_AS_PRINTF compile flag

If compiling a non DBUG binary with
-DDBUG_ASSERT_AS_PRINTF asserts will be
changed to printf + stack trace (of stack
trace are enabled).

- Changed #ifndef DBUG_OFF to
  #ifdef DBUG_ASSERT_EXISTS
  for those DBUG_OFF that was just used to enable
  assert
- Assert checking that could greatly impact
  performance where changed to DBUG_ASSERT_SLOW which
  is not affected by DBUG_ASSERT_AS_PRINTF
- Added one extra option to my_print_stacktrace() to
  get more silent in case of stack trace printing as
  part of assert.

1 files changed, 2 insertions, 2 deletions

diff --git a/sql/my_decimal.h b/sql/my_decimal.h
index 265b370a154..918213568fc 100644
--- a/sql/my_decimal.h
+++ b/sql/my_decimal.h
@@ -132,8 +132,8 @@ public:
 
   void sanity_check()
   {
-    DBUG_ASSERT(foo1 == test_value);
-    DBUG_ASSERT(foo2 == test_value);
+    DBUG_SLOW_ASSERT(foo1 == test_value);
+    DBUG_SLOW_ASSERT(foo2 == test_value);
   }
 
   void fix_buffer_pointer() { buf= buffer; }