MySQL 5.5.41发布

　　MySQL 5.5.41正式发布，此版本的更新内容如下：

　　一、编译改进

1. 　　移除了旧版本 Mac OS X 和 XCode 版本的 CMake 工作区 (Bug #18510941)
2. 　　Previously, the MYSQL_MAINTAINER_MODE CMake option was turned on by default for debug builds and off for release builds, and MYSQL_MAINTAINER_MODE caused -Werror to be enabled when building with GCC. (Bug #18313717)
3. 　　修改了构建支持，为 Clang 生成跟 gcc 一样的警告 (Bug #17959689)
4. 　　CMake configuration for the Clang compiler sets more appropriate flags for building on Linux. Specifically, -g -fno-omit-frame-pointer -fno-strict-aliasing is now added. (Bug #17633291)

　　二、新功能和功能增强

　　  新 -DWITH_UBSAN=ON CMake 选项允许 Undefined Behavior Sanitizer (Bug #19587393)

　　三、Bugs 修复

1. 　　InnoDB: An ALTER TABLE operation raised an assertion. (Bug #19908343)References: This bug is a regression of Bug #18806829.
2. 　　InnoDB: In debug builds, setting the innodb_limit_optimistic_insert_debug debug configuration option to 1 caused an infinite B-tree page split. (Bug #19904003, Bug #74605)
3. 　　InnoDB: The dict_set_corrupted() function attempted to update the clustered index of the SYS_INDEXES data dictionary table incorrectly. (Bug #19584379)
4. 　　InnoDB: A procedure, called from a function to perform an operation on a temporary table, caused the server to halt. (Bug #19306524)
5. 　　InnoDB: A CREATE TABLE operation that failed with innodb_strict_mode=ON would succeed without printing a warning with innodb_strict_mode=OFF. (Bug #17852083)
6. 　　Replication: When using a MySQL version that had been compiled with the WITH_DEBUGoption enabled, using expire_logs_days to purge binary logs caused a restart to crash the server. This problem arose after the fix for Bug #17283409. The fix ensures thatcurrent_thd is checked before calling DEBUG_SYNC(). (Bug #19553099)
7. 　　Replication: A kernel mutex contention was being caused because mysqlbinlog was calling localtime() for every event read, which in turn called stat(/etc/localtime). (Bug #72701, Bug #18808072)
8. 　　Replication: The global scope for the sql_log_bin system variable has been deprecated, and this variable can now be set with session scope only. (Bug #67433, Bug #15868071)
9. 　　InnoDB permitted a foreign key to be created which referenced a parent table for which the user did not have sufficient privileges. (Bug #18790730)
10. 　　On Windows, the replace utility did not work. (Bug #16581605)
11. 　　On CentOS 6, specifying a relative path name for the --socket option caused MySQL startup script failure. (Bug #74111, Bug #19775856)
12. 　　The IS_FREE_LOCK() and IS_USED_LOCK() function implementations contained a race condition due to which they could access freed memory when a user lock was concurrently checked and freed. (Bug #73123, Bug #19070633)
13. 　　mysql_setpermission failed to properly quote user names in SQL statements that it generated. (Bug #66317, Bug #14486004)

　　同时还发布了 MySQL 5.6.22 版本，具体更新内容请看发行说明。