[bug #59202] troff: segfault when standard output closed

[G. Branden Robinson]

Follow-up Comment #2, bug #59202 (project groff):


commit c788cf8c6bbe939fa11f7ec032e525a7e33f41b6
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Sep 29 07:02:25 2020 +1000

    Fix SEGV arising from recursing destructor.
    
    * src/roff/troff/node.h (output_file): Add class member `is_dying` to
      track whether destructor has already been entered; initialize false.
    
    * src/roff/troff/node.cpp (real_output_file::~real_output_file): Set
      `is_dying` true when destructor entered.
    
    * src/roff/troff/div.cpp (cleanup_and_exit): Only delete
      `the_output` object if it is not already being destroyed.
    
    Thanks to "hackerb9" for reporting the problem.  Problem appears to date
    back to groff 1.02 (June 1991) or earlier.
    
    Fixes <https://savannah.gnu.org/bugs/index.php?59202>.


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