Bug#36480358: Compile MySQL with GCC 14 [noclose 5.7]

Silence warning Wtemplate-id-cdtor, the MySQL 5.7 codebase
will never be built with -std=c++20

Also disable Wincompatible-pointer-types when building 'orasdk'.

From: Bug #33574176 Compile MySQL with GCC 12
 - storage/myisam/ha_myisam.cc:1275:25: error:
   using a dangling pointer to 'buf' [-Werror=dangling-pointer=]

RelWithDebInfo build must be configured with
  -DCMAKE_CXX_FLAGS="-Wno-maybe-uninitialized -Wno-uninitialized"
more warnings from boost and in 'binlog' sources.

Change-Id: Id49242553ae4124f17baa716ee95268bc76e9f2d

Author: Tor Didriksen

CMakeLists.txt

@@ -1,4 +1,4 @@
-# Copyright (c) 2006, 2023, Oracle and/or its affiliates.
+# Copyright (c) 2006, 2025, Oracle and/or its affiliates.
 # 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License, version 2.0,
@@ -712,6 +712,13 @@ IF(CMAKE_COMPILER_IS_GNUCXX AND NOT GXX_VERSION VERSION_LESS 9)
   STRING_APPEND(CMAKE_CXX_FLAGS " -Wno-class-memaccess")
 ENDIF()
 
+# Modern gcc versions will reject e.g. Bitmap<64>()
+# saying it is illegal in C++20
+MY_CHECK_CXX_COMPILER_WARNING("-Wtemplate-id-cdtor" HAS_WARN_FLAG)
+IF(HAS_WARN_FLAG)
+  STRING_APPEND(CMAKE_CXX_FLAGS " ${HAS_WARN_FLAG}")
+ENDIF()
+
 IF(NOT WITHOUT_SERVER)
   SET (MYSQLD_STATIC_PLUGIN_LIBS "" CACHE INTERNAL "")
   SET (MYSQLD_STATIC_EMBEDDED_PLUGIN_LIBS "" CACHE INTERNAL "")

storage/myisam/ha_myisam.cc

@@ -1,5 +1,5 @@
 /*
-   Copyright (c) 2000, 2023, Oracle and/or its affiliates.
+   Copyright (c) 2000, 2025, Oracle and/or its affiliates.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2.0,
@@ -1253,9 +1253,9 @@ int ha_myisam::assign_to_keycache(THD* thd, HA_CHECK_OPT *check_opt)
     /* use all keys if there's no list specified by the user through hints */
     map= table->keys_in_use_for_query.to_ulonglong();
 
+  char buf[STRING_BUFFER_USUAL_SIZE];
   if ((error= mi_assign_to_key_cache(file, map, new_key_cache)))
   { 
-    char buf[STRING_BUFFER_USUAL_SIZE];
     my_snprintf(buf, sizeof(buf),
 		"Failed to flush to index file (errno: %d)", error);
     errmsg= buf;