bug#52488: Try basename of agrv0's realpath for .pdmp lookup in libexecdir

[Ken Brown]

On 12/14/2021 2:01 PM, Bhavin Gandhi wrote:
> As the comment from load_pdump_find_executable explains, there are
> setups where the /usr/bin/emacs is a symlink managed by something like
> alternatives. This symlink eventually points to an Emacs binary like
> emacs-28.0.90. These kind of setups are used to have installation of
> multiple versions of Emacs on the same system.

This is exactly the setup that I use on Cygwin, as I alluded to in my message to 
the other bug report.  But I didn't mention there that I use symlinks managed by 
alternatives.

> Supporting resolution of these symlinks while searching for a .pdmp file
> will make it possible to put the .pdmp files in libexecdir instead of
> putting those in the /usr/bin/. I think this should be in addition to
> the possibilities tried currently.

Yes.  It's precisely because the symlinks aren't resolved that I've been putting 
the .pdmp files in /usr/bin, alongside the emacs executables.

Ken