Mysql5.6启动报错， [ERROR] InnoDB: Could not find a valid tablespace file for 'pa

通过xampp1.8.3安装的环境，由于修改了my.cnf配置，kill之前的mysql实例，重启的时候，报错，错误如下：

2014-03-10 13:48:19 7948 [ERROR] InnoDB: Could not find a valid tablespace file for 'paas/nms_link'. See http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting-datadict.html for how to resolve the issue.2014-03-10 13:48:19 7948 [ERROR] InnoDB: Tablespace open failed for '"paas"."nms_link"', ignored.2014-03-10 13:48:19 7fd80e6ea700  InnoDB: Operating system error number 2 in a file operation.InnoDB: The error means the system cannot find the path specified.InnoDB: If you are installing InnoDB, remember that you must createInnoDB: directories yourself, InnoDB does not create them.2014-03-10 13:48:19 7948 [ERROR] InnoDB: Could not find a valid tablespace file for 'paas/nms_node_tooltip_info'. See http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting-datadict.html for how to resolve the issue.2014-03-10 13:48:19 7948 [ERROR] InnoDB: Tablespace open failed for '"paas"."nms_node_tooltip_info"', ignored.2014-03-10 13:48:19 7fd80e6ea700  InnoDB: Operating system error number 2 in a file operation.InnoDB: The error means the system cannot find the path specified.InnoDB: If you are installing InnoDB, remember that you must createInnoDB: directories yourself, InnoDB does not create them.2014-03-10 13:48:19 7948 [ERROR] InnoDB: Could not find a valid tablespace file for 'paas/nms_onus_of_olt'. See http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting-datadict.html for how to resolve the issue.2014-03-10 13:48:19 7948 [ERROR] InnoDB: Tablespace open failed for '"paas"."nms_onus_of_olt"', ignored.2014-03-10 13:48:19 7fd80e6ea700  InnoDB: Operating system error number 2 in a file operation.InnoDB: The error means the system cannot find the path specified.InnoDB: If you are installing InnoDB, remember that you must createInnoDB: directories yourself, InnoDB does not create them.2014-03-10 13:48:19 7948 [ERROR] InnoDB: Could not find a valid tablespace file for 'paas/nms_topo_detect_scan_report'. See http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting-datadict.html for how to resolve the issue.2014-03-10 13:48:19 7948 [ERROR] InnoDB: Tablespace open failed for '"paas"."nms_topo_detect_scan_report"', ignored.2014-03-10 13:48:19 7fd80e6ea700  InnoDB: Operating system error number 2 in a file operation.InnoDB: The error means the system cannot find the path specified.InnoDB: If you are installing InnoDB, remember that you must createInnoDB: directories yourself, InnoDB does not create them.

原因分析：在网上找了半天，说是找不到数据目录导致的

解决办法：在my.cnf[mysqld]中加入 datadir 指定数据存放位置，重启就ok了

问题虽然解决了，但是感觉比较奇怪，为啥找不到数据位置的呢？ 安装cmake的时候，指定了  -DMYSQL_DATADIR=/mysql/mysql5.5/data 参数，按道理程序应该能找到这个datadir配置才是