Using make -C $* rather than (cd $* ; make) results in a small,
but measurable improvement in build times where compilation is
not the major component. eg.

before - ~/go/src/pkg$ time make
        real	0m1.176s
        user	0m0.639s
        sys	0m0.399s
after - ~/go/src/pkg$ time make
        real	0m0.916s
        user	0m0.571s
        sys	0m0.243s

There are other places in the distribution src/make.common for example
that could also benefit from this change.

R=adg
CC=golang-dev, rsc
https://golang.org/cl/4174055

R=rsc
CC=golang-dev
https://golang.org/cl/4170063

R=rsc, mikioh, rsc1, dho
CC=golang-dev
https://golang.org/cl/4174056

R=agl
CC=golang-dev
https://golang.org/cl/4173062

R=gri, niemeyer, rsc, r2, r
CC=golang-dev
https://golang.org/cl/4188063

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4173063

R=r
CC=golang-dev
https://golang.org/cl/4191048

pieces of an upcoming CL leaked into CL 4168056

TBR=r
CC=golang-dev
https://golang.org/cl/4180057

Update #1527.

R=adg, oerdnj
CC=golang-dev
https://golang.org/cl/4171060

Was required by old cgo but we don't
generate stub .so files anymore.

Update #1527.

R=iant
CC=golang-dev
https://golang.org/cl/4168056

PKCS#1 v2.1 section 7.1.1 says that the result of an OAEP encryption
is "an octet string of length $k$". Since we didn't left-pad the
result it was previously possible for the result to be smaller when
the most-significant byte was zero.

Fixes #1519.

R=rsc
CC=golang-dev
https://golang.org/cl/4175059

R=r, r2
CC=golang-dev
https://golang.org/cl/4184053

Flags defined in the testing package may conflict
with real flags defined in the main package, or in
any other imported package.

This change makes them less likely to be used for
other purposes.

R=r, rsc, r2
CC=golang-dev
https://golang.org/cl/4167055

R=rsc, brainman
CC=golang-dev
https://golang.org/cl/4182061

R=rsc
CC=golang-dev
https://golang.org/cl/4169058

Fixes #53.  (again)

R=agl1
CC=golang-dev
https://golang.org/cl/4167054

Almost the same definition as Go identifier names.
(Leading digits are allowed.)

Fixes #1520.

R=r, r2
CC=golang-dev
https://golang.org/cl/4173061

Fixes #1526.

R=ken2
CC=golang-dev
https://golang.org/cl/4190051

I have no idea how I meant to complete that sentence.

R=r, r2
CC=golang-dev
https://golang.org/cl/4191046

R=r, r2
CC=golang-dev
https://golang.org/cl/4173060

R=agl1, rsc
CC=golang-dev
https://golang.org/cl/4170056

Fixes #1229.

R=rsc
CC=golang-dev
https://golang.org/cl/4178048

that should look in godoc.

R=rsc, dsymonds
CC=golang-dev
https://golang.org/cl/4192041

untested.

Fixes #1523.

R=rsc
CC=golang-dev
https://golang.org/cl/4171057

R=rsc
CC=golang-dev
https://golang.org/cl/4172051

R=golang-dev, rsc, hector
CC=golang-dev, mattn
https://golang.org/cl/4180052

R=golang-dev, r2
CC=golang-dev
https://golang.org/cl/4184051

I'm not sure if it's 100% correct wrt the HTML5 specification,
but the test suite has plenty of HTML comment test cases, and
we'll shake out any tokenization bugs as the parser improves its
coverage.

R=gri
CC=golang-dev
https://golang.org/cl/4186055

Make compile-time string const comparison match semantics
of runtime.cmpstring.

Fixes #1515.

R=rsc
CC=golang-dev, rog
https://golang.org/cl/4172049

notes:
Darwin is very particular about joining a multicast group if the
listneing socket is not created in "udp4" mode, the other supported
OS's are more flexible.

A simple example sets up a socket to listen on the mdns/bonjour
group 224.0.0.251:5353

// ensure the sock is udp4, and the IP is a 4 byte IPv4
socket, err := net.ListenUDP("udp4", &net.UDPAddr {
        IP: net.IPv4zero,
        // currently darwin will not allow you to bind to
        // a port if it is already bound to another process
        Port: 5353,
})
if err != nil {
        log.Exitf("listen %s", err)
}
defer socket.Close()
err = socket.JoinGroup(net.IPv4(224, 0, 0, 251))
if err != nil {
        log.Exitf("join group %s", err)
}

R=adg, rsc
CC=golang-dev
https://golang.org/cl/4066044

R=rsc
CC=golang-dev
https://golang.org/cl/4172045

R=rsc
CC=golang-dev
https://golang.org/cl/4129042

Also sort name lists.

R=r, r2
CC=golang-dev
https://golang.org/cl/4191044

R=rsc, rog, r
CC=golang-dev
https://golang.org/cl/3775048

R=r, r2
CC=golang-dev
https://golang.org/cl/4175053

Fixes #53.

R=agl1, jacek.masiulaniec, adg, rsc, agl
CC=golang-dev
https://golang.org/cl/3794041

R=rsc, gri, rsc1, bsiegert
CC=golang-dev
https://golang.org/cl/4183053

Some significant improvements; e.g. pidigits goes from 8.33 to 6.37

Also add gccgo for regex-dna.

R=rsc
CC=golang-dev
https://golang.org/cl/4160056

Bitmaps were not being updated safely.
Depends on 4188053.

Fixes #1504.
May fix issue 1479.

R=r, r2
CC=golang-dev
https://golang.org/cl/4184048

implement runtime.casp on amd64.
keep simultaneous panic messages separate.

R=r
CC=golang-dev
https://golang.org/cl/4188053