On 04.04.19 16:27, Marshall Clow via Boost-users wrote:
> As always, the release managers would appreciate it if you download
> the candidate of your choice and give building it a try. Please report
> both success and failure, and anything else that is noteworthy.

boost::movelib::adaptive_merge continues to be broken if
iterator_traits<RandIt>::size_type != std::size_t.  This breaks
boost::container::flat_map when cross-compiling for MacOS.  I have
previously reported this error here.

I consider this a critical error - as in, I won't be able to upgrade to
Boost 1.70 at all unless this error is fixed for the release.