>>> "Eli" == Eli Zaretskii <eliz@gnu.org> writes:

   >> From: Uwe Brauer <oub@mat.ucm.es>
   >> Date: Sat, 28 Apr 2018 11:06:34 +0200
   >> 
   >> I compiled the above version yesterday. It freezes and crashes 
   >> frequently in when using gnus, without any bug-trace left. What 
   >> can I do to achieve a better bug report?

   > Run Emacs under GDB, and when it crashes type:

Thanks, but sorry for my ignorance. What do you mean by
«Run Emacs under GDB»

I googled, could not find am explanation of what that means.