Building glibc versions with the O_TMPFILE backports fails with an io/tst-open-tmpfile on the Red Hat Enterprise Linux 7 kernels. Test output:
error: openat (".", O_TMPFILE | O_RDWR): Permission denied
This is kernel bug 1590228, but this is difficult to find, so I'm filing a glibc bug for this as well.
(Builders on Red Hat Enterprise Linux 6 are not affected.)
I'm going to close this issue as CLOSED/NOTABUG since we don't have any work to do in glibc for this bug.
The bug will still be in bugzilla so if you search for CLOSED bugs you should be able to find it by the description.