Editing Building on Ubuntu Virtual Machine

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     $ ./run-octave --gui
     $ ./run-octave --gui
     >> system (sprintf ("gnome-terminal --command 'gdb -p %d'", getpid ()), "async");
     >> system (sprintf ("gnome-terminal --command 'gdb -p %d'", getpid ()), "async");
In the new terminal window that appears: First set pagination off, then apply a breakpoint at the function edit_variable (which will be hit in another thread from the current one, so apply breakpoint for all threads), then type 'c' to continue.
Apply a breakpoint at the function edit_variable (which will be hit in another thread from the current one, so apply breakpoint for all threads).
    (gdb) set pagination off
     (gdb) thread apply all break variable-editor.cc:1154
     (gdb) thread apply all break variable_editor::edit_variable
Continue.
    (gdb) c
In Octave's command line:
     >> a = [1 2]
     >> a = [1 2]
Still in Octave, locate the Workspace widget (which lists all the current variables). Double-click on the variable ‘a’. Nothing happens in Octave, but if you switch to gdb, you can see that the program stopped at the breakpoint. Now backtrace 10 to show the calling information:
In Octave, double click on the variable ‘a’. Now gdb should be at the breakpoint. Now backtrace 10 to show the calling information:
     (gdb) backtrace 10
     (gdb) backtrace 10
To disable breakpoints and continue running the program:
Apply a breakpoint at the function variable_editor_model::create (which will be hit in another thread from the current one, so apply breakpoint for all threads).
    (gdb) disable breakpoints
     (gdb) thread apply all break variable-editor-model.cc:928
     (gdb) c
= Save and Patch =
= Save and Patch =
: 8. Save your work and send patch.
: 8. Save your work and send patch.
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