Mathieu Lirzin <mthl@gnu.org> writes:

> This is likely related to commit
> 826408a7f6ca4c39ff7b7ac9952c05f48110748f [1] which make those tests work
> with Flex 2.6.4 and g++ 7.3.
>
> If you know a good way to achieve a better compatibility than the
> solution chosen by that commit, I would be interested.

Here are the logs on my system without the above commit