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doc: hints on how to cross-bootstrap

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Change-Id: I854a093b9e1a62d2515ca114ee84956510925921
Reviewed-on: https://go-review.googlesource.com/10839
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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Michael Hudson-Doyle 2015-06-10 22:13:39 +12:00 committed by Ian Lance Taylor
parent d3e8a3614c
commit deb6c5b920
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@ -110,6 +110,39 @@ Download the zip or tarball of Go 1.4 for your platform and extract it to
location).
</p>
<p>
If you want to install Go 1.5 on a system that is not supported by Go 1.4 (such
as <code>linux/ppc64</code>) you can either use
<a href="/src/bootstrap.bash">bootstrap.bash</a> on a system that can bootstrap Go
1.5 normally, or bootstrap with gccgo 5.
</p>
<p>
When run as (for example)
</p>
<pre>
$ GOOS=linux GOARCH=ppc64 ./bootstrap.bash
</pre>
<p>
<code>bootstrap.bash</code> cross-compiles a toolchain for that <code>GOOS/GOARCH</code>
combination, leaving the resulting tree in <code>../../go-${GOOS}-${GOARCH}-bootstrap</code>.
That tree can be copied to a machine of the given target type
and used as <code>GOROOT_BOOTSTRAP</code> to bootstrap a local build.
</p>
<p>
To use gccgo, you need to arrange for <code>$GOROOT_BOOSTRAP/bin/go</code> to be
the go tool that comes as part of gccgo 5. For example on Ubuntu Vivid:
</p>
<pre>
$ sudo apt-get install gccgo-5
$ sudo update-alternatives --set go /usr/bin/go-5
$ GOROOT_BOOTSTRAP=/usr ./make.bash
</pre>
<h2 id="git">Install Git, if needed</h2>
<p>