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, 20 insertions, 1 deletions

diff --git a/dbug/dbug.c b/dbug/dbug.c
index 4b96560b907..c9d63f527b4 100644
--- a/dbug/dbug.c
+++ b/dbug/dbug.c
@@ -2144,7 +2144,6 @@ void _db_flush_()
   (void) fflush(cs->stack->out_file->file);
 }
 
-
 #ifndef __WIN__
 void _db_suicide_()
 {
@@ -2198,3 +2197,23 @@ int i_am_a_dummy_function() {
 }
 
 #endif /* DBUG_OFF */
+
+/*
+  This function is called by default on DBUG_ASSERT() when compiled with
+  DBUG_ASSERT_AS_PRINTF
+*/
+
+#ifdef DBUG_ASSERT_AS_PRINTF
+
+static void default_my_dbug_assert_failed(const char *assert_expr,
+                                          const char *file,
+                                          unsigned long line)
+{
+  fprintf(stderr, "Warning: assertion failed: %s at %s line %lu\n",
+          assert_expr, file, line);
+}
+
+void (*my_dbug_assert_failed)(const char *assert_expr, const char* file,
+                              unsigned long line)= default_my_dbug_assert_failed;
+
+#endif /* DBUG_ASSERT_AS_PRINTF */