[PATCH v4 2/2] gdb/mi: add a '--force' flag to the '-break-condition' command

[Aktemur, Tankut Baris]

On Sunday, July 11, 2021 8:52 PM, Jonah Graham wrote:
> > On Wed, 5 May 2021 at 22:46, Simon Marchi <mailto:simon.marchi@polymtl.ca> wrote:
> > > +  /* There must be at least two more args: a bpnum and a condition
> > > +     expression.  */
> > > +  if (oind + 1 >= argc)
> > > +    error (_("-break-condition: Missing arguments"));
> >
> > I don't know what the standard is for MI commands, but it would be handy
> > for somebody trying this by hand to say what are the expected arguments
> > in the error message.
>
> Hi Baris and Simon,
>
> Sorry I didn't catch this earlier, but this change breaks removing conditions from MI. "-break-condition 2" should remove the condition for breakpoint 2, same as "condition 2" at CLI does\
. Instead an error message is returned:
>
> ^error,msg="-break-condition: Missing the <number> and/or <expr> argument"
>
> which corresponds to the updated error message that was actually committed.
>
> I raised https://sourceware.org/bugzilla/show_bug.cgi?id=28076 to track this.
>
> Jonah

Hi Jonah,

Sorry about this breakage.  I had implemented the behavior according to
the document, where the command was specified as

  -break-condition @var{number} @var{expr}

The 'expr' argument had seemed mandatory together with 'number'.  I conclude
that this is an oversight in the documentation because otherwise there is no
way to clear an existing breakpoint condition, as far as I know.  The 
-break-condition command was originally delegating all the arguments to the
CLI's "cond" command.  So, erasing a condition simply worked back then.

I submitted a patch to address the problem:
https://sourceware.org/pipermail/gdb-patches/2021-July/180818.html

Would you have a chance to test it?

Thanks
-Baris


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