[Buildroot] [Bug 15456] No more login on Raspberry Pi 3 since 2023.02

[bugzilla@busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15456

--- Comment #4 from Peter Seiderer <ps.report@gmx.net> ---
The systemd default locale is 'C.UTF-8' (since 252, see [1] and
/etc/locale.conf  on the board):

    $ echo $LANG
    C.UTF-8

From build/readline-8.2/nls.c:

    126 char *
    127 _rl_init_locale (void)
    128 {
    129   char *ret, *lspec;
    130
    131   /* Set the LC_CTYPE locale category from environment variables. */
    132   lspec = _rl_get_locale_var ("LC_CTYPE");
    133   /* Since _rl_get_locale_var queries the right environment variables,
    134      we query the current locale settings with setlocale(), and, if
    135      that doesn't return anything, we set lspec to the empty string to
    136      force the subsequent call to setlocale() to define the `native'
    137      environment. */
    138 #if defined (HAVE_SETLOCALE)
    139   if (lspec == 0 || *lspec == 0)
    140     lspec = setlocale (LC_CTYPE, (char *)NULL);
    141   if (lspec == 0)
    142     lspec = "";
    143   ret = setlocale (LC_CTYPE, lspec);    /* ok, since it does not change
locale */
    144 #else
    145   ret = (lspec == 0 || *lspec == 0) ? RL_DEFAULT_LOCALE : lspec;
    146 #endif
    147
    148   _rl_utf8locale = (ret && *ret) ? utf8locale (ret) : 0;
    149
    150   _rl_current_locale = savestring (ret);
    151   return ret;
    152 }

The call to '_rl_get_locale_var()' returns 'C.UTF-8' (line 132) but the
call to 'setlocale(LC_CTYPE, 'C.UTF-8')' returns 0 (line 143) which
leads to the segmentation fault in the call to 'savestring(0)' (line 150).

Setting the following in the buildroot config file fixes the problem for me:

    BR2_ENABLE_LOCALE_WHITELIST="C"
    BR2_GENERATE_LOCALE="C"

[1] https://github.com/systemd/systemd/blob/main/NEWS

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