Re: [Serusers] "libmysqlclient.so.10" or "libmysqlclient.so.12"

I would not recommend this. Changes in the major version number indicate changes in the library interface and the changes may be (and probably are -- that is the reason why the number changes) incompatible with older versions of the library resulting in crashes or some weird behavior. If you look at ldd output of mysql.so: janakj@localhost:~$ ldd /usr/local/lib/ser/modules/mysql.so libmysqlclient.so.12 => /usr/lib/libmysqlclient.so.12 (0xb7f9f000) ... It tells what version of the library (and interface) does the module need. This dependency is created by the linker at compile time. Linker looks for libmysqlclient.so (i.e. filename without any version appended) which is usually symbolic link to the latest version of the library installed: janakj@localhost:~$ ls -al /usr/lib/libmysqlclient.so* lrwxrwxrwx 1 root root 20 Oct 28 23:55 /usr/lib/libmysqlclient.so -> libmysqlclient.so.12 lrwxrwxrwx 1 root root 24 Jan 17 2004 /usr/lib/libmysqlclient.so.10 -> libmysqlclient.so.10.0.0 -rw-r--r-- 1 root root 214344 Apr 14 2003 /usr/lib/libmysqlclient.so.10.0.0 lrwxrwxrwx 1 root root 24 Oct 28 23:55 /usr/lib/libmysqlclient.so.12 -> libmysqlclient.so.12.0.0 -rw-r--r-- 1 root root 252104 Oct 13 00:38 /usr/lib/libmysqlclient.so.12.0.0 Here libmysql.so points to libmysql.so.12 which is the the latest version of the library interface installed on the system. Thus mysql.so compiled on this system would require libmysqlclient.so.12. In debian, there are two mysql development packages: janakj@localhost:~$ apt-cache search libmysqlclient-dev libmysqlclient-dev - mysql database development files libmysqlclient10-dev - LGPL-licensed client development files for MySQL databases libmysqlclient-dev would install symbolic link to the latest version which would be libmysqlclient.so -> libmysql.so.12 and corresponding header field. If you install libmysqlclient10-dev instead then link libmysqlclient.so -> libmysqlclient.so.10 would be created and modules compiled on the system would require libmysqlclient.so.10 instead of version 12. More on shared libraries: http://www.tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html Jan. On 06-12 09:23, Marian Dumitru wrote: