The monotonic clock patch changed all runtime times
to abstract monotonic time. As the result user-visible
MemStats.LastGC become monotonic time as well.
Restore Unix time for LastGC.

This is the simplest way to expose time.now to runtime that I found.
Another option would be to change time.now to C called
int64 runtime.unixnanotime() and then express time.now in terms of it.
But this would require to introduce 2 64-bit divisions into time.now.
Another option would be to change time.now to C called
void runtime.unixnanotime1(struct {int64 sec, int32 nsec} *now)
and then express both time.now and runtime.unixnanotime in terms of it.

Fixes #7852.

LGTM=minux.ma, iant
R=minux.ma, rsc, iant
CC=golang-codereviews
https://golang.org/cl/93720045

If systems actually read that much, using 2GB-1 will
result in misaligned subsequent reads. Use 1GB instead,
which will certainly keep reads aligned and which is
plenty large enough.

Update #7812.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/94070044

LGTM=dsymonds, adg, crawshaw, r, bradfitz, campoy, nigeltao, sameer, iant, robsc, djd, michael.j.fromberger, gmlewis, adonovan, rsc
R=golang-codereviews, dsymonds, adg, crawshaw, r, nigeltao, sameer, iant, robsc, djd, michael.j.fromberger, gmlewis, adonovan, rsc
CC=golang-codereviews
https://golang.org/cl/98880043

Fixes #7918

LGTM=dave
R=rsc, dave
CC=golang-codereviews
https://golang.org/cl/91980043

This change allows us to give an hg tag such as "go1.3beta1" to
revisions in the main branch without breaking the build.

This is helpful for community members who want to build the beta
from source.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/90190044

The backing memory for >1 word interfaces was being scanned
conservatively.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/94000043

go test may call builder.init() multiple times which will create a new work directory.  The cleanup needs to hoist the current work directory.
Fixes #7904.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/95900044

Generated by addca.

R=gobot
CC=golang-codereviews
https://golang.org/cl/90950044

Not only ChST but also MeST (America/Metlakatla) is a zone
name containing a lower case letter.

LGTM=robert.hencke, r
R=golang-codereviews, robert.hencke, bradfitz, r
CC=golang-codereviews
https://golang.org/cl/99910043

LGTM=aram
R=golang-codereviews, aram
CC=golang-codereviews
https://golang.org/cl/99890045

Fixes #7412.

LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/92850043

FreeBSD 10 is fully supported.

LGTM=r
R=golang-codereviews, bradfitz, r
CC=dave, golang-codereviews
https://golang.org/cl/99810044

Some system doesn't have libc.a available.

While we're at here, also export GOROOT in run.bash, so that
one doesn't need to set GOROOT to run run.bash.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/99870043

LGTM=ruiu, bradfitz
R=golang-codereviews, bradfitz, ruiu
CC=golang-codereviews
https://golang.org/cl/91840044

For gccgo we rename exported functions so that the compiler
will make them visible.  This CL adds a #define so that C
functions that #include "cgo_export.h" can use the expected
names of the function.

The test for this is the existing issue6833 test in
misc/cgo/test.  Without this CL it fails when using
-compiler=gccgo.

LGTM=minux.ma, rsc
R=golang-codereviews, gobot, rsc, minux.ma
CC=golang-codereviews
https://golang.org/cl/91830046

This should make Go build without setting CC and CXX on newer FreeBSDs.

LGTM=iant
R=golang-codereviews, dave, gobot, iant
CC=golang-codereviews
https://golang.org/cl/89230045

This CL tries to fill the gap between Linux and other Unix-like systems
in the same way UDPConn and UnixConn already did.

Fixes #7887.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/97810043

Fixes #7828.

LGTM=robert.hencke, iant, bradfitz
R=golang-codereviews, robert.hencke, iant, bradfitz
CC=golang-codereviews
https://golang.org/cl/97780045

The vi bundled with OS X has a weird bug in that if you turn off
filetype in .vimrc when it's not turned on, even a clean exit of
vi will return 1 which breaks almost everything.

While we're at it, add hint to change $GOROOT to its actual value
in .vimrc.

Fixes #7865.

LGTM=robert.hencke, dsymonds
R=golang-codereviews, robert.hencke, gobot, dsymonds
CC=golang-codereviews
https://golang.org/cl/96800046

Use a real type for Gs instead of scanning them conservatively.
Zero the schedlink pointer when it is dead.

Update #7820

LGTM=rsc
R=rsc, dvyukov
CC=golang-codereviews
https://golang.org/cl/89360043

LGTM=rsc
R=golang-codereviews, adonovan, rsc
CC=golang-codereviews
https://golang.org/cl/90440043

Oddly, 404s with the trailing slash.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/90790045

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/98740046

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/90810045

Update #7645

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/98790044

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/98740045

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/91770050

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/91860043

For the gc compiler the Go function Issue7695 is defined in
runtime.c, but there is no way to do that for gccgo, because
there is no way to get the correct pkgpath.  The test is not
important for gccgo in any case.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/93870044

Previously we used strndup(3) to implement C.CString for gccgo. This
is wrong because strndup assumes the string to be null terminated,
and stops at the first null terminator. Instead, use malloc
and memmove to create a copy of the string, as we do in the
gc implementation.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/96790047

A very smart developer at Gophercon just asked me to help debug
a problem and I was horrified to learn that he was using httputil's
ClientConn. I forgot ClientConn and ServerConn were even included
in Go 1! They should've been deleted.

Scare people away from using them. The net/http package does
not use them and they're unused, unmaintained and untouched in
4+ years.

LGTM=r
R=r, adg
CC=golang-codereviews
https://golang.org/cl/92790043

Remove an RUnlock of syscall.ForkLock with no matching RLock.
Holding ForkLock in netFD.dup is unnecessary: dupCloseOnExecOld
locks and unlocks the lock on its own and dupCloseOnExec doesn't
need the ForkLock to be held.

LGTM=iant
R=golang-codereviews, bradfitz, iant
CC=golang-codereviews
https://golang.org/cl/99800044

Previously Read wouldn't return once its internal input buffer
is filled with non-data bytes.
Fixes #7875.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/90820043

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/96850043

Fixes #7812

LGTM=josharian, iant
R=rsc, iant, adg, ruiu, minux.ma, josharian
CC=golang-codereviews
https://golang.org/cl/89900044

Fixes #7741.

LGTM=r
R=golang-codereviews, r
CC=golang-codereviews
https://golang.org/cl/96830044

The instructions in this document are useful but not reliable.
Explain the situation up top.

Fixes #7471.

LGTM=josharian, iant
R=golang-codereviews, josharian, iant
CC=golang-codereviews
https://golang.org/cl/96830045

(from the discussions on CL 89650044)

LGTM=minux.ma, iant
R=iant, minux.ma
CC=golang-codereviews
https://golang.org/cl/97770043

Fixes #7869

LGTM=dsymonds
R=golang-codereviews
CC=adg, dsymonds, golang-codereviews, rsc
https://golang.org/cl/91770048

Fixes #7645

LGTM=iant, bradfitz
R=iant, bradfitz
CC=golang-codereviews
https://golang.org/cl/90170046