Make TRASH_FREED_MEMORY a cmake option, similar to SAFEMALLOC

CMakeLists.txt

@@ -289,6 +289,16 @@ ELSEIF(WITH_SAFEMALLOC MATCHES "AUTO" AND NOT WIN32 AND NOT WITH_VALGRIND)
   SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DSAFEMALLOC")
 ENDIF()
 
+# Another memory debugging feature
+SET(THRASH_FREED_MEMORY "AUTO" CACHE STRING "Fill freed memory with specific byte pattern. Will result in slower execution. Options are: ON OFF AUTO.")
+MARK_AS_ADVANCED(THRASH_FREED_MEMORY)
+IF(THRASH_FREED_MEMORY MATCHES "ON")
+  ADD_DEFINITIONS( -DTHRASH_FREED_MEMORY)
+ELSEIF(THRASH_FREED_MEMORY MATCHES "AUTO" AND NOT WIN32 AND NOT WITH_VALGRIND AND NOT WITH_ASAN)
+  SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DTHRASH_FREED_MEMORY")
+  SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DTHRASH_FREED_MEMORY")
+ENDIF()
+
 # Set commonly used variables
 IF(WIN32)
   SET(DEFAULT_MYSQL_HOME "C:/Program Files/MariaDB ${MYSQL_BASE_VERSION}")

include/my_valgrind.h

@@ -48,7 +48,7 @@
 # define MEM_CHECK_DEFINED(a,len) ((void) 0)
 #endif /* HAVE_VALGRIND_MEMCHECK_H */
 
-#if !defined(DBUG_OFF) || defined(TRASH_FREED_MEMORY)
+#if defined(TRASH_FREED_MEMORY)
 #define TRASH_FILL(A,B,C) do { const size_t trash_tmp= (B); MEM_UNDEFINED(A, trash_tmp); memset(A, C, trash_tmp); } while (0)
 #else
 #define TRASH_FILL(A,B,C) do { MEM_UNDEFINED((A), (B)); } while (0)