These changes add a Ctty int field to the Unix syscall.ProcAttr which,
if set >= 0 in conjuction with Setsid=true, will be used by
forkAndExecInChild as the file descriptor for the new child's
controlling terminal.

Necessary changes have been made to mkerrors.sh to generate defs for
TIOC*, though changes to its output files are not included here.
The changes made should support Linux, FreeBSD and Darwin, at least.

R=iant, bradfitz, r, rsc, borman
CC=golang-dev
https://golang.org/cl/4532075

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4648053

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4639064

R=golang-dev
CC=dvyukov, golang-dev
https://golang.org/cl/4631060

This prevents ld from generating zeroed symtab entries for
sections that aren't going to be generated because dynamic
linkage has been disabled (-d was used or no dynamic libs
were seen).  Even though they were not explicitly added by
doelf, the section creation process was making them
reachable again.

The windows head is being disconsidered for this because
apparently it's not taking into account debug['d'].

This makes elflint 0.1% happier.

R=golang-dev, rsc, gustavo
CC=golang-dev
https://golang.org/cl/4638050

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4634080

This is a core API change.

1) gofix misc src
2) Manual adjustments to the following files under src/pkg:
   gob/decode.go
   rpc/client.go
   os/error.go
   io/io.go
   bufio/bufio.go
   http/request.go
   websocket/client.go
as well as:
   src/cmd/gofix/testdata/*.go.in (reverted)
   test/fixedbugs/bug243.go
3) Implemented gofix patch (oserrorstring.go) and test case (oserrorstring_test.go)

Compiles and runs all tests.

R=r, rsc, gri
CC=golang-dev
https://golang.org/cl/4607052

The test is only defined on darwin/amd64, and it fails
with recent versions of Xcode, which do not support
-gstabs+ debugging output.  At some point godefs will
have to be replaced, perhaps merged with cgo.
Godefs is not needed during builds anyway (its output files
are checked into the repository in src/pkg/runtime),
so its failure on the newer Xcode is a distraction from an
otherwise usable build.  Disable the test.

Fixes #1985.

R=golang-dev, gri, robert.hencke, r
CC=golang-dev
https://golang.org/cl/4638053

R=bradfitz, r
CC=golang-dev
https://golang.org/cl/4639049

Once these changes are effected, it is possible to construct
"8l" native on a (386?) Plan 9 system, albeit with assistance
from modules such as mkfiles that are not (yet) included in any
public patches.

8l/asm.c:
. Corrected some format qualifiers.

8l/list.c:
. Cast a print() argument to (int) to match the given format.
  It may be possible to change the format (%R), but I have not
  looked into it.

8l/obj.c:
. Removed some unused code.

8l/span.c:
. Removed unnecessary incrementation on "bp".
. Corrected some format qualifiers.

ld/data.c:
. Corrected some format qualifiers.
. Cast print argument to (int): used as field size.
. Use braces to suppress warning about empty if() statements.

ld/dwarf.c:
. Trivial spelling mistake in comment.

ld/ldelf.c:
. Added USED() statements to silence warnings.
. Dropped redundant address (&) operators.
. corrected some format qualifiers.
. Cast to (int) for switch selection variable.

ld/macho.c:
. Added USED() statements to silence warnings.

ld/ldpe.c:
. Added USED() statements to silence warnings.
. More careful use of "sect" variable.
. Corrected some format qualifiers.
. Removed redundant assignments.
. Minor fix dropped as it was submitted separately.

ld/pe.c:
. Dropped <time.h> which is now in <u.h>.
. Dropped redundant address (&) operators.
. Added a missing variable initialisation.

ld/symtab.c:
. Added USED() statements to silence warnings.
. Removed redundant incrementation.
. Corrected some format qualifiers.

All the above have been tested against a (very) recent release
and do not seem to trigger any regressions.

All review suggestions have been incorporated.

R=rsc
CC=golang-dev
https://golang.org/cl/4633043

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/4635053

Also import new weblist command from Google version.

R=r, bradfitz
CC=golang-dev
https://golang.org/cl/4650048

CL 4627051 is a better way of doing the same thing.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4654045

Will still honor MAKEFLAGS environment variable if set.

R=golang-dev
CC=bradfitz, golang-dev
https://golang.org/cl/4644049

Keeping the Julian's good refactoring work.

R=rsc
CC=golang-dev
https://golang.org/cl/4638049

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/4595055

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4528113

This change causes Print et al. to catch panics generated by
calls to String, GoString, and Format.  The panic is formatted
into the output stream as an error, but the program continues.
As a special case, if the argument was a nil pointer, the
result is just "<nil>", because that's almost certainly enough
information and handles the very common case of String
methods that don't guard against nil.

Scan does not want this change. Input must work; output can
be for debugging and it's nice to get output even when you
make a mistake.

R=dsymonds, r, adg, gri, rsc, gri
CC=golang-dev
https://golang.org/cl/4640043

R=adg, r
CC=golang-dev
https://golang.org/cl/4633054

R=golang-dev, rsc, r
CC=golang-dev
https://golang.org/cl/4630052

We'll do the right thing by default, but people wanting minimal
response sizes can explicitly remove the Date header.
(empty fields aren't written out)

R=rsc
CC=golang-dev
https://golang.org/cl/4634048

Fixes #1851.

R=rsc
CC=golang-dev
https://golang.org/cl/4628045

Fixes #1964

R=rsc
CC=golang-dev
https://golang.org/cl/4630045

R=rsc
CC=golang-dev
https://golang.org/cl/4626041

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4644043

R=golang-dev
CC=golang-dev
https://golang.org/cl/4652042

These are present when building with gcc 4.6.

R=golang-dev, dave
CC=golang-dev, lvd
https://golang.org/cl/4636047

R=gri, iant, bradfitz, fvbommel, r
CC=golang-dev
https://golang.org/cl/4652041

Fixes #1974

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4654042

R=golang-dev, bradfitz
CC=brad fitzpatrick <bradfitz, golang-dev
https://golang.org/cl/4634063

All but two packages depend on net:
        debug/proc
        os/signal

With this change, we can produce
a working build with GOOS=plan9.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4639053

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4645048

Fixed issue 1155.

R=golang-dev, adg, rsc
CC=golang-dev
https://golang.org/cl/4592059

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4628050

goinstall: make ".git" repo suffix optional

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/4643048

R=paulzhol, mirtchovski, fshahriar, alex.brainman, r
CC=golang-dev
https://golang.org/cl/4386041

Extend goinstall to support downloading from any hg/git/svn/bzr hosting
site, not just the standard ones.  The type of hosting is automatically
checked by trying all the tools, so the import statement looks like:

  import "example.com/mything"

Which will work for Mercurial (http), Subversion (http, svn), Git (http,
git) and Bazaar (http, bzr) hosting.

All the existing package imports will work through this new mechanism,
but the existing hard-coded host support is left in place to ensure
there is no change in behaviour.

R=golang-dev, bradfitz, fvbommel, go.peter.90, n13m3y3r, adg, duperray.olivier
CC=golang-dev
https://golang.org/cl/4650043

No difference in content or appearance.
Forgot to do this when I updated this file a few days ago.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4626056

currently only defined for darwin

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4528123

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4631053