Fixes #3202. (Or rather, work around issue 3202)

R=alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/7202053

Add Order field to doc.Example and write doc comments there.

Fixes #4662.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7229071

Fixes #4743.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7284044

Fixes #4686.

R=alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/7174047

R=golang-dev, dave, alex.brainman
CC=golang-dev
https://golang.org/cl/7133064

Fixes #4620.

R=rsc
CC=golang-dev
https://golang.org/cl/7241051

Expressions involving nil, even if they can be evaluated
at compile time, do not count as Go constants and cannot
be used in const initializers.

Fixes #4673.
Fixes #4680.

R=ken2
CC=golang-dev
https://golang.org/cl/7278043

Fixes #4452.

R=ken2
CC=golang-dev
https://golang.org/cl/7241065

Fixes #4663.

R=ken2
CC=golang-dev
https://golang.org/cl/7235081

Fixes #4654.

R=ken2
CC=golang-dev
https://golang.org/cl/7229072

The spec mostly uses the term embedded.
It's too late to change the field name but at least fix the docs.

Fixes #4514.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7235080

Impossible for us to check (without sleazily reaching into the
runtime) but at least document it.

Fixes #3800.

R=golang-dev, bradfitz, dave
CC=golang-dev
https://golang.org/cl/7268043

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7252045

Change the stack unwinding code to compensate for the dynamic
relocation of symbols.
Change the gc instruction GC_CALL to use a relative offset instead of
an absolute address.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7248048

Fixes #4736.

R=rsc
CC=golang-dev
https://golang.org/cl/7239045

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7220075

This updates: https://golang.org/cl/6909059/
Fixes #4511.

R=minux.ma, rsc
CC=golang-dev
https://golang.org/cl/6932054

Everybody either gets confused and thinks this is
TrimLeft/TrimRight or does this by hand which gets
repetitive looking.

R=rsc, kevlar
CC=golang-dev
https://golang.org/cl/7239044

Added the -pic flag to 6c and 6g to avoid assembler instructions that
cannot use RIP-relative adressing. This is needed to support the -shared mode
in 6l.

See also:
https://golang.org/cl/6926049
https://golang.org/cl/6822078

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7064048

* Separate internal and external LockOSThread, for cgo safety.
* Show goroutine that made faulting cgo call.
* Never start a panic due to a signal caused by a cgo call.

Fixes #3774.
Fixes #3775.
Fixes #3797.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7228081

Cut out temporary cgo file in error message.
Show C.foo instead of _Ctype_foo.

Before:
x.go:20[/var/folders/00/05_b8000h01000cxqpysvccm000n9d/T/go-build242036121/command-line-arguments/_obj/x.cgo1.go:19]: cannot use tv.Usec (type int32) as type _Ctype___darwin_suseconds_t in assignment

After:
x.go:20: cannot use tv.Usec (type int32) as type C.__darwin_suseconds_t in assignment

Fixes #4255.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7231075

The old version was using go/ast's CommentGroup.Text method,
but that method drops leading blank lines from the result, so that
if the comment looked like one of

//
// syntax error
import "C"

/*
syntax error
*/
import "C"

then the line numbers for the syntax error would be off by the
number of leading blank lines (1 in each of the above cases).

The new text extractor preserves blank lines.

Fixes #4019.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7232071

Fixes #3497.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7235075

The Unix and Plan 9 readfile call breset(b) but Windows was not,
leaving dregs in the buffer.

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/7229069

If runtime's proc.c does not compile, cmd/dist used to show
the compile errors in a sea of acid output, making them impossible
to find. Change the command invocation to write the acid output
to a file, so that the errors are the only thing shown on failure.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7221082

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/7241061

Updates #4734.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7228079

This CL removes the external storage of a cookie jar
and minimized the exported API as discussed in [1].

[1] https://groups.google.com/d/topic/golang-dev/ygDB3nbir00/discussion

Update #1960.

R=nigeltao
CC=golang-dev
https://golang.org/cl/7235065

R=golang-dev
CC=golang-dev
https://golang.org/cl/7249045

R=golang-dev, cookieo9, bradfitz
CC=golang-dev
https://golang.org/cl/7260043

A step toward a fix for issue 4069.

To allow linking with arbitrary host object files, add a linker mode
that can generate a host object file instead of an executable.
Then the host linker can be invoked to generate the final executable.

This CL adds a new -hostobj flag that instructs the linker to write
a host object file instead of an executable.

That is, this works:

        go tool 6g x.go
        go tool 6l -hostobj -o x.o x.6
        ld -e _rt0_amd64_linux x.o
        ./a.out

as does:

        go tool 8g x.go
        go tool 8l -hostld ignored -o x.o x.8
        ld -m elf_i386 -e _rt0_386_linux x.o
        ./a.out

Because 5l was never updated to use the standard relocation scheme,
it will take more work to get this working on ARM.

This is a checkpoint of the basic functionality. It does not work
with cgo yet, and cgo is the main reason for the change.
The command-line interface will likely change too.
The gc linker has other information that needs to be returned to
the caller for use when invoking the host linker besides the single
object file.

R=iant, iant
CC=golang-dev
https://golang.org/cl/7060044

Fixes #4184.

R=golang-dev, bradfitz, minux.ma, cookieo9
CC=golang-dev
https://golang.org/cl/7251044

This is a backwards compatible API change that fixes broken code.

In Go 1.0, ReadFull(r, buf) could return either len(buf), nil or len(buf), non-nil.
Most code expects only the former, so do that and document the guarantee.

Code that was correct before is still correct.
Code that was incorrect before, by assuming the guarantee, is now correct too.

The same applies to ReadAtLeast.

Fixes #4544.

R=golang-dev, bradfitz, minux.ma
CC=golang-dev
https://golang.org/cl/7235074

Also document %2f vs / ambiguity in URL.Path.

Fixes #3913.
Fixes #3659.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7225076

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7221079

Someone found software that generates negative numbers for the RSA
modulus in an X.509 certificate. Our error messages were very poor in
this case so this change improves that.

Update #4728
Return more helpful errors when RSA parameters are negative or zero.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7228072

* Reject import paths of the form cmd/x/y.
* Reject 'go install' of command outside GOPATH
* Clearer error rejecting 'go install' of package outside GOPATH.
* Name temporary binary for first file in 'go run' list or for test.
* Provide a way to pass -ldflags arguments with spaces.
* Pass all Go files (even +build ignored ones) to go fix, go fmt, go vet.
* Reject 'go run foo_test.go'.
* Silence 'exit 1' prints from 'go tool' invocations.
* Make go test -xxxprofile leave binary behind for analysis.
* Reject ~ in GOPATH except on Windows.
* Get a little less confused by symlinks.
* Document that go test x y z runs three test binaries.
* Fix go test -timeout=0.
* Add -tags flag to 'go list'.
* Use pkg/gccgo_$GOOS_$GOARCH for gccgo output.

Fixes #3389.
Fixes #3500.
Fixes #3503.
Fixes #3760.
Fixes #3941.
Fixes #4007.
Fixes #4032.
Fixes #4074.
Fixes #4127.
Fixes #4140.
Fixes #4311.
Fixes #4568.
Fixes #4576.
Fixes #4702.

R=adg
CC=golang-dev
https://golang.org/cl/7225074

Fixes #4599.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7226067

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7228067

Fixes #3802.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7228066