Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Unbreak the build by re-enabling exceptions.

Disabling them breaks build on archs using GCC. The problem is at line 156 of
bits/basic_ios.h:

if (this->exceptions() & __state)
__throw_exception_again;

With exceptions disabled __throw_exception_again is defined as

#define __throw_exception_again

at line 45 of exception_defines.h and the code results in an empty loop body,
which fails because of -Werror.

Approved by: cognet

Turn off exceptions and rtti when building the c++ version of users.
Neither is used in the program and this saves us 10KB (around 40%) in binary
size.

Reimplements users(1) in C++.

This reduces the lines of code by roughly 50% (not counting the COPYRIGHT
header) and makes it more readable by using standard algorithms.

Approved by: bapt

Perform all trivial ports to utmpx for usr.bin/.

They were already converted to use libulog, so it's easy to convert them
to utmpx.

Build usr.bin/ with WARNS=6 by default.

Also add some missing $FreeBSD$ to keep svn happy.

Add WARNS?=6, because it seems to build out of the box.

Port users(1) to libulog.

Instead of digging through the utmp database by hand, use proper API
calls to do so. Instead of parsing entries with a non-empty ut_user, we
now look at LOGIN_PROCESS entries.

WARNS=2 is going to become the default, so remove it from here.

Remove a bogus cast and lockdown users(1) with WARNS?=2

Submitted by: David Hill <david@phobia.ms>
Reviewed by: -audit
MFC after: 1 week

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

BSD 4.4 Lite Usr.bin Sources