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.

# Suppress a valgrind message about use of uninitialized memory in memchr2().
# Like memchr, it is safe to overestimate the length when the terminator
# is guaranteed to be found.  In this case, we may end up reading a word
# that is partially uninitialized, but this use is OK for a speedup.
{
    memchr2-value4
    Memcheck:Value4
    fun:memchr2
}
{
    memchr2-value8
    Memcheck:Value8
    fun:memchr2
}