The just unmasked dev-libs/boost-1.71.0 leads to a problem with boost::split as reported and fixed in the upstream issue linked above. Reproducible: Always
Created attachment 589900 [details, diff] Patch from upstream gitlab applying cleanly.
*** Bug 694478 has been marked as a duplicate of this bug. ***
Fixed in 37.0.0 which I just pushed.
*** Bug 694490 has been marked as a duplicate of this bug. ***
*** Bug 695578 has been marked as a duplicate of this bug. ***