[bug #64155] [troff] specifying -fZD on command line generates warnings

[Dave]

Follow-up Comment #43, bug #64155 (group groff):

[comment #41 comment #41:]
>     Now:
>     
>     $ echo | ./build/test-groff -fZD -a
>     <beginning of page>

A vast improvement!

But maybe a little _too_ quiet: groff disregards the -fZD flag without telling
the user it's doing so.

echo "\N'110'" | groff -ww -fZD

This fails to load the ZD family (because there is no such thing) or the ZD
font (because that's not what -f does), so outputs an "n" rather than a solid
square.  The invalid -f ought to at least provoke a warning, at least when all
warnings are activate.

This could reasonably be considered a separate bug, so I'm happy to open a new
report if warranted.


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