Fixes #1004.
Fixes #1460.

R=mattn, r, niemeyer, rog, rsc
CC=golang-dev
https://golang.org/cl/4029053

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4121057

The value of the internal flag includeNonGoFile
really is the value of the fulltextIndex flag.

R=rsc
CC=golang-dev
https://golang.org/cl/4044052

ReadRune.  (If you have a Reader but not a RuneReader, use bufio.)

The matching code is a few percent slower but significantly cleaner.

R=rsc
CC=golang-dev
https://golang.org/cl/4125046

As discussed in the mailing list, this adds a simple barrier
implementation to the sync package which enables one or more
goroutines to wait for a counter to go down to zero.

R=rsc, rog, r
CC=golang-dev
https://golang.org/cl/3770045

R=r, r2
CC=golang-dev
https://golang.org/cl/4128055

R=rsc, gri
CC=golang-dev
https://golang.org/cl/4130044

R=r
CC=golang-dev
https://golang.org/cl/4001056

R=ken2
CC=golang-dev
https://golang.org/cl/4128054

notes:
* due to Issue 1466 the Msghdr struct for
 src/pkg/syscall/ztypes_darwin_386.go
 src/pkg/syscall/ztypes_darwin_amd64.go
had to be edited after the godefs generation.
* ztypes_*.go files for linux, freebsd and darwin
have been prepared on the correct host OS and ARCH.
While the total increase is a dozen lines per file
the diff is larger due to a change to godefs,
 http://code.google.com/p/go/source/detail?r=c79e30afe9c8
while has altered the names of Pad members which
causes gofmt to realign the affected structs

R=rsc, mikioh
CC=golang-dev
https://golang.org/cl/4119053

R=adg, gri
CC=golang-dev
https://golang.org/cl/4126055

This change makes it legal to pass a struct value as receiver
outside the package declaring the struct even if the respective
struct type has non-exported fields.

This is a backwards-compatible language change motivated by the
fact that it is already possible to circumvent the assignment
restriction when calling methods through interfaces (see issue
1402).

R=r, rsc, iant, ken2
CC=golang-dev
https://golang.org/cl/3926044

This enables #cgo directives to contain a os/arch
specification which restricts the definition of
the given option to matching systems.

For example:

#cgo amd64 CFLAGS: -DAMD64=1
#cgo linux CFLAGS: -DLINUX=1
#cgo linux/amd64 CFLAGS: -DLINUX_ON_AMD64=1

R=rsc
CC=golang-dev
https://golang.org/cl/4121048

The object files begin with a header that is

        $GOARCH

on a line by itself.  This CL changes that header to

        go object $GOOS $GOARCH release.2011-01-01 4567+

where the final two fields are the most recent release
tag and the current hg version number.

All objects imported into a Go compilation or linked into an
executable must have the same header line, and that header
line must match the compiler and linker versions.

The effect of this will be that if you update and run all.bash
and then try to link in objects compiled with an earlier version
of the compiler (or invoke the wrong version of the compiler),
you will get an error showing the different headers instead
of perhaps silent incompatibility.

Normal usage with all.bash should be unaffected, because
all.bash deletes all the object files in $GOROOT/pkg/$GOOS_$GOARCH
and cleans all intermediate object files before starting.

This change is intended to diagnose stale objects arising when
users maintaining alternate installation directories forget to
rebuild some of their files after updating.

It should help make the adoption of $GOPATH (CL 3780043)
less error-prone.

R=ken2, r
CC=golang-dev
https://golang.org/cl/4023063

Prior to this CL, there were two requirements about the
package name main.

1. The package that sits at the root of the import graph
   (the one where program execution begins)
   must be named main.

2. No other package in the program can be named main.

This CL only removes requirement #2, which can be done
without changing any other Go documentation.

The new wording and formatting is such that removing
requirement #1 can be done by deleting a single line,
but making that change is explicitly outside the scope
of this CL, because it would require changes to other
documentation at the same time.

R=gri, r, gri1
CC=golang-dev
https://golang.org/cl/4126053

Since nobody suggested major changes to the higher level API, I'm
splitting up the lower level code for review. This is the first of the
changes for the packet reading/writing code.

It deliberately doesn't include a Makefile because the package is
incomplete.

R=bradfitzgo
CC=golang-dev
https://golang.org/cl/4080051

* Don't require lines to be full.
* Don't forget to flush the line buffer.
* Update the test so that it doesn't happen to include only full lines
  in order to test the above.
* Always write the line after the header as GNUPG expects it.

R=bradfitzgo
CC=golang-dev
https://golang.org/cl/4124043

OpenPGP changed its OCFB mode for more modern packets (for example, the
MDC symmetrically encrypted packet). This change adds a bool to
determine which mode is used.

R=bradfitzgo, r, rsc
CC=golang-dev
https://golang.org/cl/4126041

Fixes #1413.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4007041

R=golang-dev, r2
CC=golang-dev
https://golang.org/cl/3989061

GC is still single-threaded.
Multiple threads will happen in another CL.

Garbage collection pauses are typically
about half as long as they were before this CL.

R=brainman, iant, r
CC=golang-dev
https://golang.org/cl/3975046

Shot in the dark.

TBR=r
CC=golang-dev
https://golang.org/cl/4126054

R=rsc
CC=golang-dev
https://golang.org/cl/3989059

The timestamp file is being created before cgo
runs, which means errors will not prevent it
from being created and thus will cause the
build to break by rendering the rule up-to-date
when it isn't.

R=rsc
CC=golang-dev
https://golang.org/cl/4001049

Fixes #1463.

R=rsc
CC=golang-dev
https://golang.org/cl/4079060

so that spawned processes avoid inheriting pipes.

Implement CloseOnExec.
Make file and pipe handles inheritable.

R=rsc, brainman, vincent.vanackere
CC=golang-dev
https://golang.org/cl/4126047

Newer versions of Mercurial require the configuration
of Certification Authorities.

R=rsc
CC=golang-dev
https://golang.org/cl/4128052

Fixes #1452.

R=r
CC=golang-dev
https://golang.org/cl/4023060

Affects receive using := when new variable escapes to heap.

Fixes #1468.

R=ken2
CC=golang-dev
https://golang.org/cl/4119052

readRuner -> runeReader
unreadRuner -> runeUnreader

R=r, rsc
CC=golang-dev
https://golang.org/cl/4000054

Follow morestack, so that crashes during a stack split
give complete traces.  Also mark stack segment boundaries
as an aid to debugging.

Correct various line number bugs with yet another attempt
at interpreting the pc/ln table.  This one has a chance at
being correct, because I based it on reading src/cmd/ld/lib.c
instead of on reading the documentation.

Fixes #1138.
Fixes #1430.
Fixes #1461.

throw: runtime: split stack overflow

runtime.throw+0x3e /home/rsc/g/go2/src/pkg/runtime/runtime.c:78
        runtime.throw(0x81880af, 0xf75c8b18)
runtime.newstack+0xad /home/rsc/g/go2/src/pkg/runtime/proc.c:728
        runtime.newstack()
runtime.morestack+0x4f /home/rsc/g/go2/src/pkg/runtime/386/asm.s:184
        runtime.morestack()
----- morestack called from stack: -----
runtime.new+0x1a /home/rsc/g/go2/src/pkg/runtime/malloc.c:288
        runtime.new(0x1, 0x0, 0x0)
gongo.makeBoard+0x33 /tmp/Gongo/gongo_robot_test.go:344
        gongo.makeBoard(0x809d238, 0x1, 0xf76092c8, 0x1)
----- stack segment boundary -----
gongo.checkEasyScore+0xcc /tmp/Gongo/gongo_robot_test.go:287
        gongo.checkEasyScore(0xf764b710, 0x0, 0x809d238, 0x1)
gongo.TestEasyScore+0x8c /tmp/Gongo/gongo_robot_test.go:255
        gongo.TestEasyScore(0xf764b710, 0x818a990)
testing.tRunner+0x2f /home/rsc/g/go2/src/pkg/testing/testing.go:132
        testing.tRunner(0xf764b710, 0xf763b5dc, 0x0)
runtime.goexit /home/rsc/g/go2/src/pkg/runtime/proc.c:149
        runtime.goexit()

R=ken2, r
CC=golang-dev
https://golang.org/cl/4000053

ReadByter -> ByteReader
ReadRuner -> RuneReader

R=r, r2, rsc
CC=golang-dev
https://golang.org/cl/4023062

Include repository URL in initial mail.
Record repository and base revision in patch description.

R=r
CC=golang-dev
https://golang.org/cl/4126052

R=rsc, rog, r2
CC=golang-dev
https://golang.org/cl/4128049

If the same directory was used for multiple builds,
it was possible for a stale version.go to contain the
wrong definitions for $GOOS and $GOARCH, because
they can change even if the hg version does not.
Split into multiple files to fix.

R=r, r2
CC=golang-dev
https://golang.org/cl/4124050

Fixes #1467.

R=r, r2
CC=golang-dev
https://golang.org/cl/3981054

no semantic change.

R=rsc
CC=golang-dev
https://golang.org/cl/4128048

R=rsc
CC=golang-dev
https://golang.org/cl/4073051

Put it in the same package as ReadByter.
There is no implementation here for either interface.

R=rsc
CC=golang-dev
https://golang.org/cl/4121051

The first two "Literal" tests were silly.
Also fix a naming typo in a couple of tests.

R=rsc
CC=golang-dev
https://golang.org/cl/4127045