Re: [boost] BOOST_NO_CXX11_HDR_CHRONO?

That the header exists doesn't mean it's (reasonably) usable. Boost.Config has a test for <chrono>[1]. If it passes, it may be a reason to stop defining BOOST_NO_CXX11_HDR_CHRONO on that compiler. [1]: https://github.com/boostorg/config/blob/develop/test/boost_no_cxx11_hdr_chro...

I ran the test and had no issue to compile and run it.