- backport from 11.2.1-9.3: add --enable-host-pie, build the compilers as PIE (#2044917)
- backport from 11.2.1-9.3: use _thread_db_sizeof_pthread to obtain struct pthread size (#2034494)
- backport from 11.2.1-9.2: add support for relocation of the PCH data (pch/71934, #2044917)
- backport from 11.2.1-9.2: remove 30_threads/future/members/poll.cc (#2050090)
- backport from 11.2.1-9.2: avoid overly-greedy match in dejagnu regexp (#2050089)
- backport from 11.2.1-9.1: don't set -Wl,-rpath when building annobin (#2047356)