[bug #43569] [PATCH] fix compile warnings with gcc 4.6.3

[G. Branden Robinson]

Update of bug #43569 (project groff):

                  Status:               Need Info => In Progress            
             Assigned to:                    None => gbranden               
                 Summary: Fix for compile warnings with gcc 4.6.3 => [PATCH]
fix compile warnings with gcc 4.6.3

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Follow-up Comment #10:

>   for src/preproc/pic/pic.ypp
> ignoring return value of 'int system(const char*)' declared with
attribute 'warn_unused_result' [-Wunused-result]

This one's fixed now, too.


commit caa10102c9f4333a471a7a1779319e5b18dcce52
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Feb 24 02:01:19 2022 +1100

    [pic]: Fix "unused result" compiler warning.
    
    * src/preproc/pic/pic.ypp (placeless_element) <SH>: Check return value
      of `system()` to quieten `-Wunused-result` warning; if it is less than
      zero, report it to the standard error stream.
    
    Also bump copyright year and add editor aid comments.


I ended up doing most of these--I guess I'll look at the rest.  I already beat
on hdb.cpp some last year.

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