https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70613
--- Comment #1 from Jim Wilson <wilson at gcc dot gnu.org> ---
I see that the patch for bug 65945 was back ported to the gcc-5 branch, which
required a partial backport of the patch for bug 44282, which added abi version
9. The original patch for 44282 is missing the doc change.
The missing doc change was then added here
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=228017
which has the invoke.texi hunk we need, but is missing a ChangeLog entry for
it. So it appears all we need is a partial backport of this invoke.texi hunk.
This is mostly documenting a change to -Wabi, so we only need parts of two
hunks that document -fabi-version=9 and mention gcc-5.2.
