.
.if n \{\
.  \" Strictly, "-" is a hyphen while "\-" is a minus sign, and the
.  \" former may not always be rendered in the form expected for things like
.  \" command-line options.  Uncomment this if you want to make sure that
.  \" manual pages you're writing are clear of this problem.
.  \" if '\*[.T]'utf8' \
.  \"   char - \[hy]
.
.  \" groff 1.23.0 changed the "utf8" device to render "^" and "~"
.  \" as U+02C6 and U+02DC respectively.  This is likely to cause
.  \" considerable disruption in manual pages, so preserve the old
.  \" behaviour, at least for now.
.  if '\*[.T]'utf8' \{\
.    char ^ \[ha]
.    char ~ \[ti]
.  \}
.
.  \" "\-" is more commonly used for option dashes than for minus
.  \" signs in manual pages, so map it to plain "-" for HTML/XHTML output
.  \" rather than letting it be rendered as "−".
.  ie '\*[.T]'html' \
.    char \- \N'45'
.  el \{\
.    if '\*[.T]'xhtml' \
.      char \- \N'45'
.  \}
.\}