Windows, compile : reenable previously disabled warning C4291

no matching operator delete found; memory will not be freed if initialization throws an exception

Added a no-op delete() for MEM_ROOT based placement-new()

cmake/os/Windows.cmake

@@ -147,7 +147,7 @@ IF(MSVC)
   
   #TODO: update the code and remove the disabled warnings
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /we4700 /we4311 /we4477 /we4302 /we4090")
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4291 /we4099 /we4700 /we4311 /we4477 /we4302 /we4090")
+  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /we4099 /we4700 /we4311 /we4477 /we4302 /we4090")
   ADD_DEFINITIONS(-D_CRT_NONSTDC_NO_WARNINGS)
   IF(MYSQL_MAINTAINER_MODE MATCHES "ERR")
     SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /WX")

sql/sql_acl.cc

@@ -247,7 +247,7 @@ class ACL_USER_BASE :public ACL_ACCESS
 public:
   static void *operator new(size_t size, MEM_ROOT *mem_root)
   { return (void*) alloc_root(mem_root, size); }
-
+  static void operator delete(void *, MEM_ROOT *){}
   uchar flags;           // field used to store various state information
   LEX_CSTRING user;
   /* list to hold references to granted roles (ACL_ROLE instances) */

sql/sql_alloc.h

@@ -37,11 +37,10 @@ class Sql_alloc
   }
   static void *operator new[](size_t size, MEM_ROOT *mem_root) throw ()
   { return alloc_root(mem_root, size); }
-  static void *operator new(size_t size, MEM_ROOT *mem_root) throw ()
+  static void *operator new(size_t size, MEM_ROOT *mem_root)
   { return alloc_root(mem_root, size); }
   static void operator delete(void *ptr, size_t size) { TRASH(ptr, size); }
-  static void operator delete(void *ptr, MEM_ROOT *mem_root)
-  { /* never called */ }
+  static void operator delete(void *, MEM_ROOT *){}
   static void operator delete[](void *ptr, MEM_ROOT *mem_root)
   { /* never called */ }
   static void operator delete[](void *ptr, size_t size) { TRASH(ptr, size); }

sql/sql_cursor.h

@@ -62,6 +62,7 @@ class Server_side_cursor: protected Query_arena, public Sql_alloc
   virtual ~Server_side_cursor();
 
   static void operator delete(void *ptr, size_t size);
+  static void operator delete(void *, MEM_ROOT *){}
 };
 
 

sql/sql_prepare.h

@@ -130,6 +130,7 @@ class Ed_result_set: public Sql_alloc
   size_t get_field_count() const { return m_column_count; }
 
   static void operator delete(void *ptr, size_t size) throw ();
+  static void operator delete(void *, MEM_ROOT *){}
 private:
   Ed_result_set(const Ed_result_set &);        /* not implemented */
   Ed_result_set &operator=(Ed_result_set &);   /* not implemented */

sql/sql_select.cc

@@ -13355,6 +13355,8 @@ class COND_CMP :public ilink {
                               size_t size __attribute__((unused)))
   { TRASH(ptr, size); }
 
+  static void operator delete(void *, MEM_ROOT*) {}
+
   Item *and_level;
   Item_bool_func2 *cmp_func;
   COND_CMP(Item *a,Item_bool_func2 *b) :and_level(a),cmp_func(b) {}

sql/sql_select.h

@@ -2115,6 +2115,7 @@ class Virtual_tmp_table: public TABLE
   */
   static void *operator new(size_t size, THD *thd) throw();
   static void operator delete(void *ptr, size_t size) { TRASH(ptr, size); }
+  static void operator delete(void *, THD *) throw(){}
 
   Virtual_tmp_table(THD *thd)
   {

sql/sql_show.cc

@@ -2699,6 +2699,7 @@ class thread_info :public ilink {
   static void operator delete(void *ptr __attribute__((unused)),
                               size_t size __attribute__((unused)))
   { TRASH(ptr, size); }
+  static void operator delete(void *, MEM_ROOT *){}
 
   my_thread_id thread_id;
   uint32 os_thread_id;

storage/federatedx/ha_federatedx.h

@@ -170,6 +170,8 @@ class federatedx_io
   { return alloc_root(mem_root, size); }
   static void operator delete(void *ptr, size_t size)
   { TRASH(ptr, size); }
+  static void operator delete(void *, MEM_ROOT *)
+  { }
 
   virtual int query(const char *buffer, size_t length)=0;
   virtual FEDERATEDX_IO_RESULT *store_result()=0;