enable -Wenum-compare -Wenum-conversion

to make the all headers -std=c++20 clean for those, who need c++20
(some plugins)

cmake/maintainer.cmake

@@ -22,6 +22,8 @@ ENDIF()
 SET(MY_WARNING_FLAGS
   -Wall
   -Wdeclaration-after-statement
+  -Wenum-compare
+  -Wenum-conversion
   -Wextra
   -Wformat-security
   -Wno-format-truncation

sql/gcalc_tools.cc

@@ -132,7 +132,7 @@ int Gcalc_function::count_internal(const char *cur_func, uint set_type,
   int mask= (c_op & op_not) ? 1:0;
   uint n_ops= c_op & ~(op_any | op_not | v_mask);
   uint n_shape= c_op & ~(op_any | op_not | v_mask); /* same as n_ops */
-  value v_state= (value) (c_op & v_mask);
+  op_type v_state= (op_type) (c_op & v_mask);
   int result= 0;
   const char *sav_cur_func= cur_func;
 

sql/gcalc_tools.h

@@ -52,17 +52,15 @@ class Gcalc_function
   int count_internal(const char *cur_func, uint set_type,
                      const char **end);
 public:
-  enum value
-  {
-    v_empty=   0x0000000,
-    v_find_t=  0x1000000,
-    v_find_f=  0x2000000,
-    v_t_found= 0x3000000,
-    v_f_found= 0x4000000,
-    v_mask=    0x7000000
-  };
   enum op_type
   {
+    v_empty=          0x00000000,
+    v_find_t=         0x01000000,
+    v_find_f=         0x02000000,
+    v_t_found=        0x03000000,
+    v_f_found=        0x04000000,
+    v_mask=           0x07000000,
+
     op_not=           0x80000000,
     op_shape=         0x00000000,
     op_union=         0x10000000,

sql/handler.h

@@ -2636,10 +2636,10 @@ class Cost_estimate
   double import_cost;     /* cost of remote operations     */
   double mem_cost;        /* cost of used memory           */
   
-  enum { IO_COEFF=1 };
-  enum { CPU_COEFF=1 };
-  enum { MEM_COEFF=1 };
-  enum { IMPORT_COEFF=1 };
+  static const int IO_COEFF=1;
+  static const int CPU_COEFF=1;
+  static const int MEM_COEFF=1;
+  static const int IMPORT_COEFF=1;
 
   Cost_estimate()
   {

sql/sql_class.h

@@ -5133,8 +5133,8 @@ my_eof(THD *thd)
 
 inline date_conv_mode_t sql_mode_for_dates(THD *thd)
 {
-  static_assert((date_conv_mode_t::KNOWN_MODES &
-                time_round_mode_t::KNOWN_MODES) == 0,
+  static_assert((ulonglong(date_conv_mode_t::KNOWN_MODES) &
+                 ulonglong(time_round_mode_t::KNOWN_MODES)) == 0,
                 "date_conv_mode_t and time_round_mode_t must use different "
                 "bit values");
   static_assert(MODE_NO_ZERO_DATE    == date_mode_t::NO_ZERO_DATE &&

sql/sql_lex.h

@@ -1995,8 +1995,7 @@ class Query_tables_list
     @retval nonzero if the statement is a row injection
   */
   inline bool is_stmt_row_injection() const {
-    return binlog_stmt_flags &
-      (1U << (BINLOG_STMT_UNSAFE_COUNT + BINLOG_STMT_TYPE_ROW_INJECTION));
+    return binlog_stmt_flags & (1U << BINLOG_STMT_TYPE_ROW_INJECTION);
   }
 
   /**
@@ -2006,8 +2005,7 @@ class Query_tables_list
   */
   inline void set_stmt_row_injection() {
     DBUG_ENTER("set_stmt_row_injection");
-    binlog_stmt_flags|=
-      (1U << (BINLOG_STMT_UNSAFE_COUNT + BINLOG_STMT_TYPE_ROW_INJECTION));
+    binlog_stmt_flags|= (1U << BINLOG_STMT_TYPE_ROW_INJECTION);
     DBUG_VOID_RETURN;
   }
 
@@ -2283,7 +2281,7 @@ class Query_tables_list
       The statement is a row injection (i.e., either a BINLOG
       statement or a row event executed by the slave SQL thread).
     */
-    BINLOG_STMT_TYPE_ROW_INJECTION = 0,
+    BINLOG_STMT_TYPE_ROW_INJECTION = BINLOG_STMT_UNSAFE_COUNT,
 
     /** The last element of this enumeration type. */
     BINLOG_STMT_TYPE_COUNT
@@ -2297,8 +2295,8 @@ class Query_tables_list
     - The low BINLOG_STMT_UNSAFE_COUNT bits indicate the types of
       unsafeness that the current statement has.
 
-    - The next BINLOG_STMT_TYPE_COUNT bits indicate if the statement
-      is of some special type.
+      - The next BINLOG_STMT_TYPE_COUNT-BINLOG_STMT_TYPE_COUNT bits indicate if
+      the statement is of some special type.
 
     This must be a member of LEX, not of THD: each stored procedure
     needs to remember its unsafeness state between calls and each