bug#7575: gdb command history saving

[Pete Beardmore]

Hi.

When GDB is used through emacs, command history is not saved to my  
.gdbhist file on gdb 'quit'.

I use a MinGW/msys/bash environment. When gdb is used from the shell  
prompt, the settings in .gdbinit are sufficient to ensure ~/.gdbhist  
(or h:/install/MinGW/msys/1.0/home/pbeardm1/.gdbhist ..I've  
experimented with both) is successfully written to with the GDB  
command history.

When i use GNU emacs 23.2.1 (i386-mingw-nt5.1.2600) from this shell  
and start the debugger within, having typed a few arbitrary commands  
to populate the command history / ring, i quit the debugger and ..

..observe a time stamp change on the correct .gdbhist file ..BUT find  
its content exactly as it was previously i.e. with nothing appended.

I expect to see my last GDB commands written to the file.

Note: through emacs, this file is not read either ..which makes me  
think that i haven't tweaked 'input ring' settings to use this file as  
a 'ring source' or something. I enquired on the IRC channel and got  
tumbleweeds ..hence i call this a 'bug' (quotes) to leave room for the  
possibility of it being a trivial config issue!

Thanks.