VAX FP: awk: floating point exception: Floating point overflow

Today's slice of VAX fun comes courtesy of this little fragment

echo 12345678911234567892123456789312345678941234567895123456 \
| awk '{split($0,a);print a[1]}'

On most machines this outputs:
12345678911234567892123456789312345678941234567895123456

On the VAX: "awk: floating point exception: Floating point overflow"

This is generated by awk's lib.c "is_number()" calling strtod()

        errno = 0;
        r = strtod(s, &ep);
        if (ep == s || errno == ERANGE)
                return 0;

which traps in strtod.c:526  "dval(&rv) *= bigtens[j];" when the
string passed is too big to represent as a double.

The attached strtod_test.c demonstrates this for anyone who cares :)

strtod() has some ifdef VAX "vax_ovfl_check" but obviously its not
catching this case.

So, is this an issue with the default SIGFPE generation logic, or
should strtod() be handing this case and avoiding the potential
overflow?