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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug testsuite/30400] [gdb/testsuite] FAIL: gdb.base/readline.exp:
 set width 7 (timeout)
Date: Sat, 29 Apr 2023 07:41:32 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30400

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
In configure.ac we have:
...
# These are the libraries checked by Readline.=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
AC_SEARCH_LIBS(tgetent, [termcap tinfow tinfo curses ncursesw ncurses])
...

I didn't have termcap installed (which supplies termcap and curses).

AFAICT, ncurses supplies tinfow, tinfo, ncursesw, and ncurses.

So after deinstalling that, no library is found.

So, I guess this is the behaviour we get when using stub-termcap.o:
...
if test "$ac_cv_search_tgetent" =3D no; then
  CONFIG_OBS=3D"$CONFIG_OBS stub-termcap.o"
fi
...

In rl_redisplay we hit this code:
...
  /* If we can move the cursor up and down, then use multiple lines,=20=20=
=20=20=20=20=20=20=20=20=20=20
     otherwise, let long lines display in a single terminal line, and=20=20=
=20=20=20=20=20=20=20=20=20
     horizontally scroll it. */
  displaying_prompt_first_line =3D 1;
  if (_rl_horizontal_scroll_mode =3D=3D 0 && _rl_term_up && *_rl_term_up)
    ...
  else                          /* Do horizontal scrolling. Much simpler */
...
and do horizontal scrolling, even though _rl_horizontal_scroll_mode =3D=3D =
0,
because _rl_term_up =3D=3D nullptr.

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