Bug#24296291: FIX -WUNUSED-PARAMETER WARNINGS

Patch mysql#22: As a final step, remove disabling of
the -Wunused-parameter GCC/Clang compiler warning option.

Author: jhauglid

cmake/maintainer.cmake

@@ -41,8 +41,7 @@ SET(MY_C_WARNING_FLAGS
     "${MY_WARNING_FLAGS} -Wwrite-strings -Wdeclaration-after-statement")
 
 # Common warning flags for G++ and Clang++
-SET(MY_CXX_WARNING_FLAGS
-    "${MY_WARNING_FLAGS} -Woverloaded-virtual -Wno-unused-parameter")
+SET(MY_CXX_WARNING_FLAGS "${MY_WARNING_FLAGS} -Woverloaded-virtual")
 
 # GCC bug #36750 (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36750)
 # Remove when we require GCC >= 5.1 everywhere.

sql/sql_table.cc

@@ -4629,13 +4629,11 @@ const char* find_fk_supporting_index(Alter_info *alter_info,
   problems with duplicate foreign key names while we have two
   definitions of the same table.
 
-  @param thd            Thread handle.
   @param table_def      Table object.
   @param alter_ctx      ALTER TABLE runtime context.
  */
 
-static void restore_foreign_key_names(THD *thd,
-                                      dd::Table *table_def,
+static void restore_foreign_key_names(dd::Table *table_def,
                                       const Alter_table_ctx &alter_ctx)
 {
   // Restore the original name for pre-existing foreign keys
@@ -8739,7 +8737,7 @@ static bool mysql_inplace_alter_table(THD *thd,
       table definition. Since we now have only one defintion, the names
       can be restored.
     */
-    restore_foreign_key_names(thd, altered_table_def, *alter_ctx);
+    restore_foreign_key_names(altered_table_def, *alter_ctx);
 
     if (thd->dd_client()->update(altered_table_def))
       goto cleanup2;
@@ -11941,7 +11939,7 @@ bool mysql_alter_table(THD *thd, const char *new_db, const char *new_name,
       goto err_with_mdl;
     DBUG_ASSERT(new_table != nullptr);
 
-    restore_foreign_key_names(thd, new_table, alter_ctx);
+    restore_foreign_key_names(new_table, alter_ctx);
     if (thd->dd_client()->update(new_table))
       goto err_with_mdl;