[bug #62273] [man] throws undefined register warning on ja, zh man pages

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?62273>

                 Summary: [man] throws undefined register warning on ja,zh man
pages
                 Project: GNU troff
            Submitted by: gbranden
            Submitted on: Fri 08 Apr 2022 10:54:58 PM UTC
                Category: Macro man
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

This is a post-1.22.4 issue, exposed by my work on man(7) localization.


$ zcat /usr/share/man/zh_CN/man1/lexgrog.1.gz | tgu -kz -man -mzh
troff: backtrace: '.../groff/build/../tmac/an.tmac':146: macro
'an*reset-hyphenation-mode'
troff: backtrace: '.../groff/build/../tmac/an.tmac':261: macro 'TH'
troff: backtrace: file '<standard input>':14
troff:<standard input>:14: warning: register 'chinese*hyphenation-mode-base'
not defined
$ zcat /usr/share/man/ja/man1/lexgrog.1.gz | tgu -kz -man -mja
troff: backtrace: '.../groff/build/../tmac/an.tmac':146: macro
'an*reset-hyphenation-mode'
troff: backtrace: '.../groff/build/../tmac/an.tmac':261: macro 'TH'
troff: backtrace: file '<standard input>':14
troff:<standard input>:14: warning: register 'japanese*hyphenation-mode-base'
not defined


The fix is straightforward.  Prior to it, I have a pending commit to add test
cases to ensure we don't regress the value of hyphenation bit 1 (i.e., 2^1=2,
the one that suppresses hyphenation before a vertical position trap).




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