move alloca() definition from all *.h files to one new header file

include/CMakeLists.txt

@@ -37,6 +37,7 @@ SET(HEADERS
   ma_dyncol.h
   my_list.h
   my_alloc.h
+  my_alloca.h
   typelib.h 
   my_dbug.h 
   m_string.h
@@ -105,6 +106,7 @@ ENDMACRO()
 
 INSTALL_COMPAT_HEADER(my_global.h "")
 INSTALL_COMPAT_HEADER(my_config.h "")
+INSTALL_COMPAT_HEADER(my_alloca.h "")
 INSTALL_COMPAT_HEADER(my_sys.h "")
 INSTALL_COMPAT_HEADER(mysql_version.h "
 #include <mariadb_version.h>

include/my_alloca.h

+/* Copyright (c) 2023, MariaDB Corporation.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA */
+
+#ifndef MY_ALLOCA_INCLUDED
+#define MY_ALLOCA_INCLUDED
+
+#ifdef _WIN32
+#include <malloc.h> /*for alloca*/
+/*
+  MSVC may define "alloca" when compiling in /Ze mode
+  (with extensions from Microsoft), but otherwise only
+  the _alloca function is defined:
+*/
+#ifndef alloca
+#define alloca _alloca
+#endif
+#else
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+#endif
+
+#if defined(HAVE_ALLOCA)
+/*
+  If the GCC/LLVM compiler from the MinGW is used,
+  alloca may not be defined when using the MSVC CRT:
+*/
+#if defined(__GNUC__) && !defined(HAVE_ALLOCA_H) && !defined(alloca)
+#define alloca __builtin_alloca
+#endif /* GNUC */
+#endif
+
+#endif /* MY_ALLOCA_INCLUDED */

include/my_global.h

@@ -358,13 +358,6 @@ C_MODE_END
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
-#if defined(__cplusplus) && defined(NO_CPLUSPLUS_ALLOCA)
-#undef HAVE_ALLOCA
-#undef HAVE_ALLOCA_H
-#endif
-#ifdef HAVE_ALLOCA_H
-#include <alloca.h>
-#endif
 
 #include <errno.h>				/* Recommended by debian */
 /* We need the following to go around a problem with openssl on solaris */
@@ -521,6 +514,7 @@ typedef unsigned short ushort;
 #endif
 
 #include <my_compiler.h>
+#include <my_alloca.h>
 
 /*
   Wen using the embedded library, users might run into link problems,

include/my_sys.h

@@ -36,9 +36,7 @@ typedef struct my_aio_result {
 #include <m_ctype.h>                    /* for CHARSET_INFO */
 #include <stdarg.h>
 #include <typelib.h>
-#ifdef _WIN32
-#include <malloc.h> /*for alloca*/
-#endif
+#include <my_alloca.h>
 #include <mysql/plugin.h>
 #include <mysql/service_my_print_error.h>
 
@@ -196,16 +194,6 @@ my_bool my_test_if_atomic_write(File handle, int pagesize);
 extern my_bool my_may_have_atomic_write;
 
 #if defined(HAVE_ALLOCA) && !defined(HAVE_valgrind)
-#if defined(_AIX) && !defined(__GNUC__) && !defined(_AIX43)
-#pragma alloca
-#endif /* _AIX */
-#if defined(__MWERKS__)
-#undef alloca
-#define alloca _alloca
-#endif /* __MWERKS__ */
-#if defined(__GNUC__) && !defined(HAVE_ALLOCA_H) && ! defined(alloca)
-#define alloca __builtin_alloca
-#endif /* GNUC */
 #define my_alloca(SZ) alloca((size_t) (SZ))
 #define my_afree(PTR) ((void)0)
 #define MAX_ALLOCA_SZ 4096

include/mysql/service_encryption.h

@@ -24,22 +24,19 @@
   *provider* (encryption plugin).
 */
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #ifndef MYSQL_ABI_CHECK
+#include <my_alloca.h>
 #ifdef _WIN32
-#include <malloc.h>
 #ifndef __cplusplus
 #define inline __inline
 #endif
 #else
 #include <stdlib.h>
-#ifdef HAVE_ALLOCA_H
-#include <alloca.h>
 #endif
 #endif
+
+#ifdef __cplusplus
+extern "C" {
 #endif
 
 /* returned from encryption_key_get_latest_version() */

plugin/cracklib_password_check/cracklib_password_check.c

@@ -13,7 +13,7 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
 
-#include <my_global.h>
+#include <my_alloca.h>
 #include <mysql/plugin_password_validation.h>
 #include <crack.h>
 #include <string.h>

plugin/handler_socket/handlersocket/hstcpsvr_worker.cpp

@@ -6,7 +6,7 @@
  * See COPYRIGHT.txt for details.
  */
 
-#include <my_global.h>
+#include <my_alloca.h>
 #include <netinet/in.h>
 #include <errno.h>
 #include <poll.h>
@@ -17,9 +17,6 @@
 #if __linux__
 #include <sys/epoll.h>
 #endif
-#ifdef HAVE_ALLOCA_H
-#include <alloca.h>
-#endif
 
 #include "hstcpsvr_worker.hpp"
 #include "string_buffer.hpp"

plugin/handler_socket/libhsclient/allocator.hpp

@@ -11,6 +11,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <my_alloca.h>
 
 #if 0
 extern "C" {