bug#51894: 27.2; GDB Gud support on Cygwin has trouble accessing shared files on Windows network drives.

[Eli Zaretskii <eliz@gnu.org>]

> From: Guy Offer <guyof@checkpoint.com>
> CC: "kbrown@cornell.edu" <kbrown@cornell.edu>,
>         "51894@debbugs.gnu.org"
> 	<51894@debbugs.gnu.org>
> Date: Thu, 18 Nov 2021 08:54:22 +0000
> 
> Also, can you try "M-x gud-gdb RET" instead, and see if the problem exists there as well?  Maybe there's something in gdb-mi.el that doesn't work well in this case, in particular when it parses the file names reported by GDB's MI interface.  For that reason, I'd be interested to see the raw data about source file names emitted by GDB in response to Emacs's queries.  For that purpose, activate the gdb-enable-debug minor mode, and show the contents of the variable gdb-debug-log after a command that results in such failures.
> 
> =====> The gud-gdb does not have the IDE support (it only runs the gdb on a single window without opening the source files, stack or variable windows).

That's not entirely true: it does open a window with the source file.

Anyway I'm not saying you should use "M-x gud-gdb" instead of "M-x
gdb", I'm asking you to try gud-gdb just this once to see if it is
capable of resolving these file names.  Could you please try that and
report the results?  Knowing that could give some hint about where to
look for the reasons of your original problem.

Thanks.