https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70139
--- Comment #2 from Viktor Ostashevskyi <ostash at ostash dot kiev.ua> ---
Exception occurs, because in:
regex_traits::lookup_classname(...):
{
...
static const pair<const char*, char_class_type> __classnames[] =
{
{"d", ctype_base::digit},
{"w", {ctype_base::alnum, _RegexMask::_S_under}},
{"s", ctype_base::space},
{"alnum", ctype_base::alnum},
{"alpha", ctype_base::alpha},
{"blank", ctype_base::blank},
{"cntrl", ctype_base::cntrl},
{"digit", ctype_base::digit},
{"graph", ctype_base::graph},
{"lower", ctype_base::lower},
{"print", ctype_base::print},
{"punct", ctype_base::punct},
{"space", ctype_base::space},
{"upper", ctype_base::upper},
{"xdigit", ctype_base::xdigit},
};
...
}
array element for "w" class is initialized to {0, 0} with
-fno-ellide-constructors.
