Just upgraded to Boost 1.74 from Boost 1.71. I'm getting a warning:
FWIW, we also recently upgraded to 1.74 (from 1.72), and started seeing similar warnings.
I fixed one in our own sources, but indeed some of those new warnings didn't go away,
and I couldn't track them down in our own code. So you seem to confirm they come from Boost itself. --DD