R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5622043

This patch adds a function to get the current cpu ticks.  This is
deemed to be 'sufficiently random' to use to seed fastrand to mitigate
the algorithmic complexity attacks on the hash table implementation.

On AMD64 we use the RDTSC instruction.  For 386, this instruction,
while valid, is not recognized by 8a so I've inserted the opcode by
hand.  For ARM, this routine is currently stubbed to return a constant
0 value.

Future work: update 8a to recognize RDTSC.

Fixes #2630.

R=rsc
CC=golang-dev
https://golang.org/cl/5606048

R=golang-dev, alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/5605050

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5622048

 - Unified bounary conditions for NFC and NFD and removed some indirections.
   This enforces boundaries at the character level, which is typically what
   the user expects. (NFD allows a boundary between 'a' and '`', for example,
   which may give unexpected results for collation.  The current implementation
   is already stricter than the standard, so nothing much changes.  This change
   just formalizes it.
 - Moved methods of qcflags to runeInfo.
 - Swapped YesC and YesMaybe bits in qcFlags. This is to aid future changes.
 - runeInfo return values use named fields in preperation for struct change.
 - Replaced some left-over uint32s with rune.

R=r
CC=golang-dev
https://golang.org/cl/5607050

R=r
CC=golang-dev
https://golang.org/cl/5605051

R=rsc, gri
CC=golang-dev
https://golang.org/cl/5620049

R=golang-dev
CC=bradfitz, golang-dev
https://golang.org/cl/5606050

R=golang-dev, dsymonds, bradfitz
CC=golang-dev
https://golang.org/cl/5619050

Without this change, fd3 can be collected by the garbage
collector and finalized, which causes the file descriptor to
be closed, which causes the call to os.Open to return 3 rather
than the expected descriptor number.

R=golang-dev, gri, bradfitz, bradfitz, iant
CC=golang-dev
https://golang.org/cl/5607056

Detected semi-automatically. There are probably more.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5620046

The rule is that build directives can be preceded only
by blank lines and other line comments, not /* */ comments.

R=golang-dev, adg, bradfitz
CC=golang-dev
https://golang.org/cl/5619045

R=golang-dev, adg, bradfitz
CC=golang-dev
https://golang.org/cl/5615046

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5615045

R=golang-dev, adg, alex.brainman
CC=golang-dev
https://golang.org/cl/5602050

Fixes #2715

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5614043

This prevents an incorrect summary line from appearing in the godoc
package list.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5607059

Fixes #2816.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5609048

This prevents the message from showing up in godoc.

R=rsc
CC=golang-dev
https://golang.org/cl/5610046

This is a minimal API extension, it makes it possible
to implement missing Int functionality externally w/o
compromising efficiency. It is the hope that this will
reduce the number of feature requests going directly
into the big package.

Also: Fixed some naming inconsistencies: The receiver
is only called z when it is also the result.

R=golang-dev, agl
CC=golang-dev
https://golang.org/cl/5607055

This will add the temporary object directory into the lookup
path so that cgo-exported function declarations may be
included from C files.

This was previously applied by CL 5600043, and apparently
removed by mistake on CL 5598045.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5610054

The gccgo compiler used to fail to parse this.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5610051

R=rsc
CC=golang-dev
https://golang.org/cl/5484076

R=golang-dev, bradfitz, rsc, adg
CC=golang-dev
https://golang.org/cl/5606045

This can happen on Plan 9 if we we're building
with the 32-bit and 64-bit host compilers, one
after the other.

R=rsc
CC=golang-dev
https://golang.org/cl/5599053

Fixes #2541.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5610045

Also re-enable simple IPv4 multicast testing on windows.

R=alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/5605048

It's no longer generated by make.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5602047

On Plan 9 this flag is used to discover
constant expressions in "if" statements.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5601060

Plan 9's tr(1) doesn't accept the C-style escapes
for tab and newline characters.  I was going to use
the \xFF hexadecimal escapes but GNU tr(1) doesn't
accept those.  It seems octal is the least common
denominator.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5576079

Previously, I had made available a tarball of
the modified system headers that were necessary
to build on Plan 9 but that was only a stopgap.
I think this method is much better since no
files outside of $GOROOT will have to be added
or modified during the build process.

Also, this is just the first step. I'll change
the build to reference these files in another CL
(that also contains a few more Makefile changes).

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5552056

This can drastically reduce the number of system
calls made by programs that repeatedly query the
environment.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5599054

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5576080

Ignore result of setting SO_BROADCAST.

Disable TestSimpleListenMulticastUDP as
setIPv4MulticastInterface is not implemented.

R=golang-dev, bradfitz, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/5610044

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5605046

Print all the syntax errors.  Fixes issue 2811.

Change Windows binary removal strategy.
This should keep the temporary files closer to
the binaries they are for, which will make it
more likely that the rename is not cross-device
and also make it easier to clean them up.
Fixes #2604 (as much as we can).

The standard build does not use the go command
to install the go command anymore, so issue 2604
is less of a concern than it originally was.
(It uses the go_bootstrap command to install
the go command.)

Buffer 'go list' output.

R=golang-dev, bradfitz, r
CC=golang-dev
https://golang.org/cl/5604048

Don't throw away factory functions returning error or rune.

Fixes #2820.

R=rsc
CC=golang-dev
https://golang.org/cl/5604046

Black box test is too time-consuming, as the bug
does not appear until Scan has processed 2 GB of
input in total across multiple calls, so no test.

Thanks to Frederick Mayle for the diagnosis and fix.

Fixes #2809.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5611043

Both are unused and undocumented.

InvalidConnError is also non-idiomatic: a FooError type can
typically describe something, else it would be an ErrFoo
variable.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/5609045

Do not treat $GOROOT/src/pkg, $GOROOT/src/cmd,
$GOPATH/src as package directories (only subdirectories
of those can be package directories).  Fixes issue 2602.

Accept additional compiler and linker arguments during
cgo from $CGO_CFLAGS and $CGO_LDFLAGS, as the
Makefiles used to do.

Show failed pkg-config output.  Fixes issue 2785.

Use different (perhaps better) git commands.  Fixes issue 2109.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5605045