On Mon, Aug 28, 2017 at 12:18 PM, Denys Vlasenko
<vda.linux@googlemail.com> wrote:
> glibc/uclibc need more extensive changes, since they use a pointer to store
> the position. This is a test in busybox tree which fails miserably
> because of that:
>
> https://git.busybox.net/busybox/tree/shell/hush_test/hush-getopts/getopt_test_libc_bug.tests
> # This test can fail with libc with buggy getopt() implementation.
> # If getopt() wants to parse multi-option args (-abc),
> # it needs to remember a position within current arg.
> #
> # If this position is kept as a POINTER, not an offset,
> # and if argv[] ADDRESSES (not contents!) change, it blows up.


uclibc would need something like this patch (not tested at all):