long-options: add parse_gnu_standard_options_only Discussed in https://bugs.gnu.org/33468 . * lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead of 0. (parse_gnu_standard_options_only): Add function to process the GNU default options --help and --version and fail for any other unknown long or short option. See https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html . * lib/long-options.h (parse_gnu_standard_options_only): Declare it. * modules/long-options (depends-on): Add stdbool, exitfail. * top/maint.mk (sc_prohibit_long_options_without_use): Update syntax-check rule, add new function name.

# mbtowc.m4 serial 3
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_MBTOWC],
[
  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])

  AC_CHECK_FUNCS([mbtowc])
  if test $ac_cv_func_mbtowc = no; then
    HAVE_MBTOWC=0
  else
    if false; then
      REPLACE_MBTOWC=1
    fi
  fi
])

# Prerequisites of lib/mbtowc.c.
AC_DEFUN([gl_PREREQ_MBTOWC], [
  :
])