Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

More -Wmissing-variable-declarations fixes.

In addition to adding missing `static' keywords:
- bin/dd: Pull in `extern.h' to guarantee consistency with source file.
- libexec/rpc.rusersd: Move shared globals into an extern.h.
- libexec/talkd: Move `debug' and `hostname' into extern.h.
- usr.bin/cksum: Put counters in extern.h, as they are used by ckdist/mtree.
- usr.bin/m4: Move `end_result' into extern.h.
- usr.sbin/services_mkdb: Move shared globals into an extern.h.

Synchronize with laster version of m4 from OpenBSD and NetBSD
This bring better compatibility with gnum4

Reviewed by: cognet
Approved by: cognet
Obtained from: OpenBSD, NetBSD

Fix build of m4 with WARNS=6.

Change the parser; rename `exp' to `exponent' not to collide with exp(3).

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

Fix m4 to properly handle bitwise operators &, ^, and |. Fix operator
precedence. Add short-circuit evaluation.

PR: bin/60914
Reviewed by: petef
Discussed with: jeff, petef

When we appear to want a signed value from sizeof(), use ssize_t in the cast,
rather than int.

Kill extraneous whitespace.

Functions declared as <type> <identifier>(<nil>) should be declared as
<type> <identifier>(<void-type>) in ANSI C.

Rename `eqrelval' which was renamed from `eqrel' to quiet a shadow warning
to `op' as suggested by Bruce, as this is used to store the operator between
vl and vr.

Submitted by: bde

Revert vendor identifiers, and #if 0 what is #if 0/#else for OpenBSD.

Add __FBSDID() properly.

Requested by: bde, mike

Add some spurious veritcal whitespace to reduce diffs to OpenBSD.

Merge local changes again, against ANSIfied m4(1).

Crank WARNS.

Cast sizeof() to (int), as it's being compared against an int, not a size_t.
If i is changed to a size_t, it means the logic must be slightly changed later
in the flow, where --i is checked to be >= 0. I am not sure I want to make a
logic change to account for clearing up a warning, when an aesthetic one will
keep from modifying the logic.

Other harmless casts, that I think I've made in the right directions.

Make gpbc() an inline function, rather than an obfuscated macro, make its
scratch space local, rather than global. The previous macro used a dirty
hack (logical AND in place of a conditional) which would lead GCC to throw
a fit (rightly so) as the logical check, as well as the incrementation of
a variable, were not used for anything.

const'ify a few places where gcc3 yells. xstrdup() some global consts in
places where we xstrdup() when not using consts, but tried to assign them
to non-consts before.

Don't use execv(2) if we don't have the kind of arguments it wants.

Reviewed by: asmodai obrien tjr
Submitted by: tjr (a gcc3 build log)

Bring OpenBSD m4(1) off of the OPENBSD vendor branch, and add the -s option,
$FreeBSD$ identifiers, and fix initialisation to stderr to happen in a function
as stderr is not the same in CURRENT as in OpenBSD.

Reviewed by: obrien

remove __P

Remove trailing whitespace.

1) kill temp diver upon exit
2) add logical ops, fix ! precedence, implement unary +, fix exp
Obtained from: NetBSD

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