Kernel hang with latest snapshot

[Li Guanglei]

Mike Mason wrote:
> The lket-b2a code, and thus the systemtap build, now appears to be 
> dependent on the mysqlclient library by default.  Probably not a good idea.
> 
>  From a build of the latest systemtap CVS on ppc64:
> 
> gcc  -g -O2   -o lket-b2a `pkg-config --libs glib-2.0` `mysql_config 
> --libs` lket_b2a-lket_b2a.o
> /usr/bin/ld: cannot find -lmysqlclient
> collect2: ld returned 1 exit status
> make[2]: *** [lket-b2a] Error 1
> make[2]: Leaving directory 
> `/home/mmason/systemtap-CVS/src/runtime/lket/b2a'
> make[1]: *** [all-recursive] Error 1
> make[1]: Leaving directory `/home/mmason/systemtap-CVS/src'
> make: *** [all] Error 2
> 
> - Mike

the dependence on mysqlclient lib is optional, which means if it isn't 
installed, configure will just give a warning and skip building 
lket-b2a without mysql support.

But one issue is that mysql doesn't afford a pkgconfig .pc file, so I 
check the existence of mysqlclient lib in autoconf by checking the 
existence of mysql_config. The problem is that if you installed both 
mysql-ppc and mysql-ppc64 on your ppc64 box, the mysqlclient build env 
will be messed up. One way to deal with it is to uninstall both 
mysql-ppc/mysql-ppc64 and install mysql-ppc only. The building of 
lket-b2a need a 32-bit mysqlclient lib, while the RHEL defaultely will 
first install mysql-ppc, then mysql-ppc64, which breaks the building 
of 32-bit app using mysqlclient.

- Guanglei