On Thu, Jul 27, 2017 at 2:11 AM, Gavin Lambert via Boost-users <boost-users@lists.boost.org> wrote:

On 25/07/2017 02:33, Dominique Devienne wrote:

I'm trying to understand what's going on;
obviously there's some kind of semantic change with optional argument to switches.

Could anyone shed some light on this please? I'm not sure how to proceed now. TIA, -DD

Sounds like https://github.com/boostorg/program_options/issues/25.

Thanks a bunch Gavin for pointing it out. The work-around allows me to move past this despite using 1.64.

This is apparently fixed in 1.65.

Yes, now that you've pointed it out, I see this have been merged on master,

so will be in 1.65 indeed (I guess, I don't quite know the Boost release process). --DD