[Interest] Suddenly can't access sql database

[Robert Wood]

I have a Qt program I use for talking to my sql database which has been 
working for about three years through various versions of 
[Mandriva/Mageia] Linux. Today, on my desktop only, it has suddenly 
stopped working. Fortunately it still works on my laptop so I can at 
least access it to get at data.

I have tried to set a breakpoint to see what's going on and I can 
suddenly no longer set breakpoints either.

I have done some [Mageia] software updates, but I don't particularly 
remember anything to do with Qt. I did do an auto remove orphans which I 
suppose might have done some damage. I've tried uninstalling and 
reinstalling Qt to no avail.

I can access the mysql database from the command line on my desktop, so 
I guess it's a Qt problem rather than an OS issue.

The Application Output in Qt says this:

Debugging starts
&"warning: GDB: Failed to set controlling terminal: Invalid argument\n"
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE
QSqlQuery::exec: database not open
Debugging has finished

This line:

&"warning: GDB: Failed to set controlling terminal: Invalid argument\n"

When Googled talks about gdb  v7.x not working with Qt and I am running 
version 7.2, but I don't remember gdb being updated recently and the 
changelog in Control Centre suggests it's not been updated for quite 
some time. so, as I have been running Qt on this machine with this 
version of Mageia for a few months I a, thinking this is not the issue 
with the debugger. (I am running in debug, not release mode.)

Anyone able to help please?

Many thanks.