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doc: document go1.1 build tag

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Fixes #5235.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8426048
This commit is contained in:
Andrew Gerrand 2013-04-08 11:41:01 +10:00
parent b6bfc92df3
commit 78c4d50d25
2 changed files with 27 additions and 1 deletions
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25
doc/go1.1.html
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@ -403,6 +403,31 @@ command now returns an error if test files are provided on the command line. In
this sense, "<code>go run</code>" replaces "<code>go run *.go</code>".
</p>
<h3 id="tags">Build constraints</h3>
<p>
The <code>"go1.1</code>" tag has been added to the list of default
<a href="/pkg/go/build/#hdr-Build_Constraints">build constraints</a>.
This permits packages to take advanage of the new features in Go 1.1 while
remaining compatible with earlier versions of Go.
</p>
<p>
To build a file only with Go 1.1 and above, add this build constraint:
</p>
<pre>
// +build go1.1
</pre>
<p>
To build a file only with Go 1.0.x, use the converse constraint:
</p>
<pre>
// +build !go1.1
</pre>
<h3 id="platforms">Additional platforms</h3>
<p>

3
src/pkg/go/build/doc.go
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@ -91,8 +91,9 @@
//
// - the target operating system, as spelled by runtime.GOOS
// - the target architecture, as spelled by runtime.GOARCH
// - the compiler being used, currently either "gc" or "gccgo"
// - the compiler being used, either "gc" or "gccgo"
// - "cgo", if ctxt.CgoEnabled is true
// - "go1.1", from Go version 1.1 onward
// - any additional words listed in ctxt.BuildTags
//
// If a file's name, after stripping the extension and a possible _test suffix,