URL:
<https://savannah.gnu.org/bugs/?64866>
Summary: [troff] throws useless warning about `bd` request in
nroff mode
Group: GNU roff
Submitter: gbranden
Submitted: Mon 06 Nov 2023 03:21:04 PM UTC
Category: Core
Severity: 2 - Minor
Item Group: Warning/Suspicious behaviour
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
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Follow-up Comments:
-------------------------------------------------------
Date: Mon 06 Nov 2023 03:21:04 PM UTC By: G. Branden Robinson <gbranden>
Observed when building NetHack.
cat Guidebook.dated.mn | ../util/makedefs --grep --input - --output - \
| tbl tmac.n - | nroff -c -Tascii | col -bx > Guidebook.txt
troff:tmac.n:762: error: cannot load font 'S' for emboldening
Terminals are unlikely to support an `S` font, so my first instinct was just
to modify _tmac.n_ to prefix the `bd` request with `.if n`. But technically
that might not be allowed by its license
([https://github.com/NetHack/NetHack/blob/NetHack-3.7/doc/tmac.n#L17 "please
do not distribute this package if you make any changes"]).
But that was okay, because it made me stop and think longer.
Terminals can't do what `bd` is defined to do in the first place. Some of
them can overstrike, but not with tiny (and reliable) offsets.
So, in nroff mode, GNU troff should ignore the `bd` request like it does, say,
`ps`.
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