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Russ Cox 509140a549 cmd/go: delay gcc/clang flag support checks 
env.MkEnv was computing the full gcc command line to report as
$GOGCCFLAGS in "go env" output, which meant running gcc (or clang)
multiple times to discern which flags are available.
We also set $GOGCCFLAGS in the environment, but nothing actually uses
that as far as I can tell - it was always intended only for debugging.
Move GOGCCFLAGS to env.ExtraEnvVars, which displayed in "go env"
output but not set in child processes and not computed nearly as
often.

The effect is that trivial commands like "go help" or "go env GOARCH"
or "go tool -n compile" now run in about 0.01s instead of 0.1s,
because they no longer run gcc 4 times each.

go test -short cmd/go drops from 81s to 44s (and needs more trimming).

The $GOROOT/test suite drops from 92s to 33s, because the number of
gcc invocation drops from 13,336 to 0.

Overall, all.bash drops from 5m53s to 4m07s wall time.

Change-Id: Ia85abc89e1e2bb126b933aff3bf7c5f6c0984cd5
Reviewed-on: https://go-review.googlesource.com/73850
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
 		2017-10-27 14:23:04 +00:00
.github .github: update ISSUE_TEMPLATE to be closer to 'go bug' 2017-08-19 04:06:10 +00:00
api unicode: update to Unicode 10.0.0 2017-10-24 12:42:35 +00:00
doc spec: match syntax for method expressions with implementations 2017-10-25 22:49:03 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc cmd/link, plugin: always encode path 2017-10-26 15:08:37 +00:00
src cmd/go: delay gcc/clang flag support checks 2017-10-27 14:23:04 +00:00
test test: add type alias test that caused gccgo to crash 2017-10-26 22:52:53 +00:00
.gitattributes
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.gitignore .gitignore: include only Go project artifiacts 2017-08-15 21:37:05 +00:00
AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
CONTRIBUTING.md .github: recommend 'go bug' when filing an issue 2017-07-24 17:18:34 +00:00
CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
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README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
robots.txt
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://golang.org/dl/.

After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.

Contributing

Go is the work of hundreds of contributors. We appreciate your help!

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project does not use GitHub pull requests, and that we use the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.