Re: [PATCH] gdb: support source tracking for multi-location breakpoints

[Alexandra Petlanova Hajkova <ahajkova@redhat.com>]

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On Sat, Oct 3, 2026 at 1:38 PM Andrew Burgess <aburgess@redhat.com> wrote:

> Currently, when breakpoint source tracking is enabled (see 'set
> breakpoint source-tracking enabled on'), GDB will not source track
> multi-location breakpoints.
>
> As a first take this was fine, but I think that we can support source
> tracking for some multi-location breakpoints.
>
> Source tracking only applies to breakpoints set based on a file and
> line number, so the rest of this discussion is only concerned with
> this case.  This includes things like 'break file:line' and also
> 'break line'.  In the latter case GDB uses the current source file to
> provide the filename, so the two cases are really equivalent.
>
> If we consider 'break file:line' then there are two ways that this can
> resolve to multiple locations.
>
> First, if 'file:line' lands in an inline function, and the inline
> function is inlined multiple times (or has an out-of-line
> instantiation) then there can be multiple locations.  However, there
> is only a single source line for all of these breakpoint locations,
> the original line in the single original file.
>
>
> Hi Andrew,

 I like your approach. My initial restriction on all multi-threaded
breakpoints was too broad.
It's great the source-tracking actually works for the inlined functions.

Thank you for your improvement,
Alexandra

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