mirror of
https://github.com/golang/go
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2be7788f83
Fixes #41861 Change-Id: I7aa9370c7762986ee07ba6ff7f6ebda067559f06 Reviewed-on: https://go-review.googlesource.com/c/go/+/260757 Trust: Keith Randall <khr@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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757 lines
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<!--{
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"Title": "Installing Go from source",
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"Path": "/doc/install/source"
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}-->
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<h2 id="introduction">Introduction</h2>
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<p>
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Go is an open source project, distributed under a
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<a href="/LICENSE">BSD-style license</a>.
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This document explains how to check out the sources,
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build them on your own machine, and run them.
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</p>
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<p>
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Most users don't need to do this, and will instead install
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from precompiled binary packages as described in
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<a href="/doc/install">Getting Started</a>,
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a much simpler process.
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If you want to help develop what goes into those precompiled
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packages, though, read on.
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</p>
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<div class="detail">
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<p>
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There are two official Go compiler toolchains.
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This document focuses on the <code>gc</code> Go
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compiler and tools.
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For information on how to work on <code>gccgo</code>, a more traditional
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compiler using the GCC back end, see
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<a href="/doc/install/gccgo">Setting up and using gccgo</a>.
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</p>
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<p>
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The Go compilers support the following instruction sets:
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<dl>
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<dt>
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<code>amd64</code>, <code>386</code>
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</dt>
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<dd>
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The <code>x86</code> instruction set, 64- and 32-bit.
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</dd>
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<dt>
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<code>arm64</code>, <code>arm</code>
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</dt>
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<dd>
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The <code>ARM</code> instruction set, 64-bit (<code>AArch64</code>) and 32-bit.
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</dd>
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<dt>
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<code>mips64</code>, <code>mips64le</code>, <code>mips</code>, <code>mipsle</code>
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</dt>
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<dd>
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The <code>MIPS</code> instruction set, big- and little-endian, 64- and 32-bit.
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</dd>
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<dt>
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<code>ppc64</code>, <code>ppc64le</code>
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</dt>
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<dd>
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The 64-bit PowerPC instruction set, big- and little-endian.
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</dd>
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<dt>
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<code>riscv64</code>
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</dt>
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<dd>
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The 64-bit RISC-V instruction set.
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</dd>
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<dt>
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<code>s390x</code>
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</dt>
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<dd>
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The IBM z/Architecture.
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</dd>
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<dt>
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<code>wasm</code>
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</dt>
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<dd>
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<a href="https://webassembly.org">WebAssembly</a>.
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</dd>
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</dl>
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</p>
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<p>
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The compilers can target the AIX, Android, DragonFly BSD, FreeBSD,
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Illumos, Linux, macOS/iOS (Darwin), NetBSD, OpenBSD, Plan 9, Solaris,
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and Windows operating systems (although not all operating systems
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support all architectures).
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</p>
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<p>
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A list of ports which are considered "first class" is available at the
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<a href="/wiki/PortingPolicy#first-class-ports">first class ports</a>
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wiki page.
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</p>
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<p>
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The full set of supported combinations is listed in the
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discussion of <a href="#environment">environment variables</a> below.
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</p>
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<p>
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See the main installation page for the <a href="/doc/install#requirements">overall system requirements</a>.
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The following additional constraints apply to systems that can be built only from source:
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</p>
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<ul>
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<li>For Linux on PowerPC 64-bit, the minimum supported kernel version is 2.6.37, meaning that
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Go does not support CentOS 6 on these systems.
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</li>
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</ul>
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</div>
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<h2 id="go14">Install Go compiler binaries for bootstrap</h2>
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<p>
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The Go toolchain is written in Go. To build it, you need a Go compiler installed.
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The scripts that do the initial build of the tools look for a "go" command
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in <code>$PATH</code>, so as long as you have Go installed in your
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system and configured in your <code>$PATH</code>, you are ready to build Go
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from source.
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Or if you prefer you can set <code>$GOROOT_BOOTSTRAP</code> to the
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root of a Go installation to use to build the new Go toolchain;
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<code>$GOROOT_BOOTSTRAP/bin/go</code> should be the go command to use.</p>
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<h3 id="bootstrapFromBinaryRelease">Bootstrap toolchain from binary release</h3>
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<p>
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To use a binary release as a bootstrap toolchain, see
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<a href="/dl/">the downloads page</a> or use any other
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packaged Go distribution.
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</p>
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<h3 id="bootstrapFromSource">Bootstrap toolchain from source</h3>
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<p>
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To build a bootstrap toolchain from source, use
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either the git branch <code>release-branch.go1.4</code> or
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<a href="https://dl.google.com/go/go1.4-bootstrap-20171003.tar.gz">go1.4-bootstrap-20171003.tar.gz</a>,
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which contains the Go 1.4 source code plus accumulated fixes
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to keep the tools running on newer operating systems.
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(Go 1.4 was the last distribution in which the toolchain was written in C.)
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After unpacking the Go 1.4 source, <code>cd</code> to
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the <code>src</code> subdirectory, set <code>CGO_ENABLED=0</code> in
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the environment, and run <code>make.bash</code> (or,
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on Windows, <code>make.bat</code>).
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</p>
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<p>
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Once the Go 1.4 source has been unpacked into your GOROOT_BOOTSTRAP directory,
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you must keep this git clone instance checked out to branch
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<code>release-branch.go1.4</code>. Specifically, do not attempt to reuse
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this git clone in the later step named "Fetch the repository." The go1.4
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bootstrap toolchain <b>must be able</b> to properly traverse the go1.4 sources
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that it assumes are present under this repository root.
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</p>
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<h3 id="bootstrapFromCrosscompiledSource">Bootstrap toolchain from cross-compiled source</h3>
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<p>
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To cross-compile a bootstrap toolchain from source, which is
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necessary on systems Go 1.4 did not target (for
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example, <code>linux/ppc64le</code>), install Go on a different system
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and run <a href="/src/bootstrap.bash">bootstrap.bash</a>.
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</p>
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<p>
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When run as (for example)
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</p>
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<pre>
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$ GOOS=linux GOARCH=ppc64 ./bootstrap.bash
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</pre>
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<p>
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<code>bootstrap.bash</code> cross-compiles a toolchain for that <code>GOOS/GOARCH</code>
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combination, leaving the resulting tree in <code>../../go-${GOOS}-${GOARCH}-bootstrap</code>.
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That tree can be copied to a machine of the given target type
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and used as <code>GOROOT_BOOTSTRAP</code> to bootstrap a local build.
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</p>
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<h3 id="bootstrapFromGccgo">Bootstrap toolchain using gccgo</h3>
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<p>
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To use gccgo as the bootstrap toolchain, you need to arrange
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for <code>$GOROOT_BOOTSTRAP/bin/go</code> to be the go tool that comes
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as part of gccgo 5. For example on Ubuntu Vivid:
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</p>
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<pre>
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$ sudo apt-get install gccgo-5
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$ sudo update-alternatives --set go /usr/bin/go-5
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$ GOROOT_BOOTSTRAP=/usr ./make.bash
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</pre>
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<h2 id="git">Install Git, if needed</h2>
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<p>
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To perform the next step you must have Git installed. (Check that you
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have a <code>git</code> command before proceeding.)
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</p>
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<p>
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If you do not have a working Git installation,
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follow the instructions on the
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<a href="https://git-scm.com/downloads">Git downloads</a> page.
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</p>
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<h2 id="ccompiler">(Optional) Install a C compiler</h2>
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<p>
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To build a Go installation
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with <code><a href="/cmd/cgo">cgo</a></code> support, which permits Go
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programs to import C libraries, a C compiler such as <code>gcc</code>
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or <code>clang</code> must be installed first. Do this using whatever
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installation method is standard on the system.
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</p>
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<p>
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To build without <code>cgo</code>, set the environment variable
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<code>CGO_ENABLED=0</code> before running <code>all.bash</code> or
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<code>make.bash</code>.
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</p>
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<h2 id="fetch">Fetch the repository</h2>
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<p>Change to the directory where you intend to install Go, and make sure
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the <code>goroot</code> directory does not exist. Then clone the repository
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and check out the latest release tag (<code class="versionTag">go1.12</code>,
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for example):</p>
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<pre>
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$ git clone https://go.googlesource.com/go goroot
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$ cd goroot
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$ git checkout <span class="versionTag"><i><tag></i></span>
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</pre>
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<p class="whereTag">
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Where <code><tag></code> is the version string of the release.
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</p>
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<p>Go will be installed in the directory where it is checked out. For example,
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if Go is checked out in <code>$HOME/goroot</code>, executables will be installed
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in <code>$HOME/goroot/bin</code>. The directory may have any name, but note
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that if Go is checked out in <code>$HOME/go</code>, it will conflict with
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the default location of <code>$GOPATH</code>.
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See <a href="#gopath"><code>GOPATH</code></a> below.</p>
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<p>
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Reminder: If you opted to also compile the bootstrap binaries from source (in an
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earlier section), you still need to <code>git clone</code> again at this point
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(to checkout the latest <code><tag></code>), because you must keep your
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go1.4 repository distinct.
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</p>
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<h2 id="head">(Optional) Switch to the master branch</h2>
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<p>If you intend to modify the go source code, and
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<a href="/doc/contribute.html">contribute your changes</a>
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to the project, then move your repository
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off the release branch, and onto the master (development) branch.
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Otherwise, skip this step.</p>
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<pre>
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$ git checkout master
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</pre>
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<h2 id="install">Install Go</h2>
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<p>
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To build the Go distribution, run
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</p>
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<pre>
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$ cd src
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$ ./all.bash
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</pre>
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<p>
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(To build under Windows use <code>all.bat</code>.)
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</p>
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<p>
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If all goes well, it will finish by printing output like:
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</p>
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<pre>
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ALL TESTS PASSED
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---
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Installed Go for linux/amd64 in /home/you/go.
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Installed commands in /home/you/go/bin.
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*** You need to add /home/you/go/bin to your $PATH. ***
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</pre>
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<p>
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where the details on the last few lines reflect the operating system,
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architecture, and root directory used during the install.
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</p>
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<div class="detail">
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<p>
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For more information about ways to control the build, see the discussion of
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<a href="#environment">environment variables</a> below.
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<code>all.bash</code> (or <code>all.bat</code>) runs important tests for Go,
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which can take more time than simply building Go. If you do not want to run
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the test suite use <code>make.bash</code> (or <code>make.bat</code>)
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instead.
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</p>
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</div>
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<h2 id="testing">Testing your installation</h2>
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<p>
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Check that Go is installed correctly by building a simple program.
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</p>
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<p>
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Create a file named <code>hello.go</code> and put the following program in it:
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</p>
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<pre>
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package main
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import "fmt"
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func main() {
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fmt.Printf("hello, world\n")
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}
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</pre>
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<p>
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Then run it with the <code>go</code> tool:
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</p>
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<pre>
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$ go run hello.go
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hello, world
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</pre>
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<p>
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If you see the "hello, world" message then Go is installed correctly.
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</p>
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<h2 id="gopath">Set up your work environment</h2>
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<p>
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You're almost done.
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You just need to do a little more setup.
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</p>
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<p>
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<a href="/doc/code.html" class="download" id="start">
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<span class="big">How to Write Go Code</span>
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<span class="desc">Learn how to set up and use the Go tools</span>
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</a>
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</p>
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<p>
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The <a href="/doc/code.html">How to Write Go Code</a> document
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provides <b>essential setup instructions</b> for using the Go tools.
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</p>
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<h2 id="tools">Install additional tools</h2>
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<p>
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The source code for several Go tools (including <a href="/cmd/godoc/">godoc</a>)
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is kept in <a href="https://golang.org/x/tools">the go.tools repository</a>.
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To install one of the tools (<code>godoc</code> in this case):
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</p>
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<pre>
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$ go get golang.org/x/tools/cmd/godoc
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</pre>
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<p>
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To install these tools, the <code>go</code> <code>get</code> command requires
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that <a href="#git">Git</a> be installed locally.
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</p>
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<p>
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You must also have a workspace (<code>GOPATH</code>) set up;
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see <a href="/doc/code.html">How to Write Go Code</a> for the details.
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</p>
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<h2 id="community">Community resources</h2>
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<p>
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The usual community resources such as
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<code>#go-nuts</code> on the <a href="https://freenode.net/">Freenode</a> IRC server
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and the
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<a href="//groups.google.com/group/golang-nuts">Go Nuts</a>
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mailing list have active developers that can help you with problems
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with your installation or your development work.
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For those who wish to keep up to date,
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there is another mailing list, <a href="//groups.google.com/group/golang-checkins">golang-checkins</a>,
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that receives a message summarizing each checkin to the Go repository.
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</p>
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<p>
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Bugs can be reported using the <a href="//golang.org/issue/new">Go issue tracker</a>.
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</p>
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<h2 id="releases">Keeping up with releases</h2>
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<p>
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New releases are announced on the
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<a href="//groups.google.com/group/golang-announce">golang-announce</a>
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mailing list.
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Each announcement mentions the latest release tag, for instance,
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<code class="versionTag">go1.9</code>.
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</p>
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<p>
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To update an existing tree to the latest release, you can run:
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</p>
|
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<pre>
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$ cd go/src
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$ git fetch
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$ git checkout <span class="versionTag"><i><tag></i></psan>
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$ ./all.bash
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</pre>
|
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|
|
<p class="whereTag">
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Where <code><tag></code> is the version string of the release.
|
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</p>
|
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|
|
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<h2 id="environment">Optional environment variables</h2>
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<p>
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The Go compilation environment can be customized by environment variables.
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<i>None is required by the build</i>, but you may wish to set some
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to override the defaults.
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</p>
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<ul>
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<li><code>$GOROOT</code>
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<p>
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The root of the Go tree, often <code>$HOME/go1.X</code>.
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Its value is built into the tree when it is compiled, and
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|
defaults to the parent of the directory where <code>all.bash</code> was run.
|
|
There is no need to set this unless you want to switch between multiple
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local copies of the repository.
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</p>
|
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</li>
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<li><code>$GOROOT_FINAL</code>
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<p>
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The value assumed by installed binaries and scripts when
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<code>$GOROOT</code> is not set explicitly.
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It defaults to the value of <code>$GOROOT</code>.
|
|
If you want to build the Go tree in one location
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|
but move it elsewhere after the build, set
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<code>$GOROOT_FINAL</code> to the eventual location.
|
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</p>
|
|
</li>
|
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|
|
<li id="gopath"><code>$GOPATH</code>
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|
<p>
|
|
The directory where Go projects outside the Go distribution are typically
|
|
checked out. For example, <code>golang.org/x/tools</code> might be checked out
|
|
to <code>$GOPATH/src/golang.org/x/tools</code>. Executables outside the
|
|
Go distribution are installed in <code>$GOPATH/bin</code> (or
|
|
<code>$GOBIN</code>, if set). Modules are downloaded and cached in
|
|
<code>$GOPATH/pkg/mod</code>.
|
|
</p>
|
|
|
|
<p>The default location of <code>$GOPATH</code> is <code>$HOME/go</code>,
|
|
and it's not usually necessary to set <code>GOPATH</code> explicitly. However,
|
|
if you have checked out the Go distribution to <code>$HOME/go</code>,
|
|
you must set <code>GOPATH</code> to another location to avoid conflicts.
|
|
</p>
|
|
</li>
|
|
|
|
<li><code>$GOBIN</code>
|
|
<p>
|
|
The directory where executables outside the Go distribution are installed
|
|
using the <a href="/cmd/go">go command</a>. For example,
|
|
<code>go get golang.org/x/tools/cmd/godoc</code> downloads, builds, and
|
|
installs <code>$GOBIN/godoc</code>. By default, <code>$GOBIN</code> is
|
|
<code>$GOPATH/bin</code> (or <code>$HOME/go/bin</code> if <code>GOPATH</code>
|
|
is not set). After installing, you will want to add this directory to
|
|
your <code>$PATH</code> so you can use installed tools.
|
|
</p>
|
|
|
|
<p>
|
|
Note that the Go distribution's executables are installed in
|
|
<code>$GOROOT/bin</code> (for executables invoked by people) or
|
|
<code>$GOTOOLDIR</code> (for executables invoked by the go command;
|
|
defaults to <code>$GOROOT/pkg/$GOOS_GOARCH</code>) instead of
|
|
<code>$GOBIN</code>.
|
|
</p>
|
|
</li>
|
|
|
|
<li><code>$GOOS</code> and <code>$GOARCH</code>
|
|
<p>
|
|
The name of the target operating system and compilation architecture.
|
|
These default to the values of <code>$GOHOSTOS</code> and
|
|
<code>$GOHOSTARCH</code> respectively (described below).
|
|
</li>
|
|
|
|
<p>
|
|
Choices for <code>$GOOS</code> are
|
|
<code>android</code>, <code>darwin</code>, <code>dragonfly</code>,
|
|
<code>freebsd</code>, <code>illumos</code>, <code>ios</code>, <code>js</code>,
|
|
<code>linux</code>, <code>netbsd</code>, <code>openbsd</code>,
|
|
<code>plan9</code>, <code>solaris</code> and <code>windows</code>.
|
|
</p>
|
|
|
|
<p>
|
|
Choices for <code>$GOARCH</code> are
|
|
<code>amd64</code> (64-bit x86, the most mature port),
|
|
<code>386</code> (32-bit x86), <code>arm</code> (32-bit ARM), <code>arm64</code> (64-bit ARM),
|
|
<code>ppc64le</code> (PowerPC 64-bit, little-endian), <code>ppc64</code> (PowerPC 64-bit, big-endian),
|
|
<code>mips64le</code> (MIPS 64-bit, little-endian), <code>mips64</code> (MIPS 64-bit, big-endian),
|
|
<code>mipsle</code> (MIPS 32-bit, little-endian), <code>mips</code> (MIPS 32-bit, big-endian),
|
|
<code>s390x</code> (IBM System z 64-bit, big-endian), and
|
|
<code>wasm</code> (WebAssembly 32-bit).
|
|
</p>
|
|
|
|
<p>
|
|
The valid combinations of <code>$GOOS</code> and <code>$GOARCH</code> are:
|
|
<table cellpadding="0">
|
|
<tr>
|
|
<th width="50"></th><th align="left" width="100"><code>$GOOS</code></th> <th align="left" width="100"><code>$GOARCH</code></th>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>aix</code></td> <td><code>ppc64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>android</code></td> <td><code>386</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>android</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>android</code></td> <td><code>arm</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>android</code></td> <td><code>arm64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>darwin</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>darwin</code></td> <td><code>arm64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>dragonfly</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>freebsd</code></td> <td><code>386</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>freebsd</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>freebsd</code></td> <td><code>arm</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>illumos</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>ios</code></td> <td><code>arm64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>js</code></td> <td><code>wasm</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>386</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>arm</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>arm64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>ppc64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>ppc64le</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>mips</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>mipsle</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>mips64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>mips64le</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>riscv64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>linux</code></td> <td><code>s390x</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>netbsd</code></td> <td><code>386</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>netbsd</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>netbsd</code></td> <td><code>arm</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>openbsd</code></td> <td><code>386</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>openbsd</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>openbsd</code></td> <td><code>arm</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>openbsd</code></td> <td><code>arm64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>plan9</code></td> <td><code>386</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>plan9</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>plan9</code></td> <td><code>arm</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>solaris</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>windows</code></td> <td><code>386</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td></td><td><code>windows</code></td> <td><code>amd64</code></td>
|
|
</tr>
|
|
</table>
|
|
<br>
|
|
|
|
<li><code>$GOHOSTOS</code> and <code>$GOHOSTARCH</code>
|
|
<p>
|
|
The name of the host operating system and compilation architecture.
|
|
These default to the local system's operating system and
|
|
architecture.
|
|
</p>
|
|
</li>
|
|
|
|
<p>
|
|
Valid choices are the same as for <code>$GOOS</code> and
|
|
<code>$GOARCH</code>, listed above.
|
|
The specified values must be compatible with the local system.
|
|
For example, you should not set <code>$GOHOSTARCH</code> to
|
|
<code>arm</code> on an x86 system.
|
|
</p>
|
|
|
|
<li><code>$GO386</code> (for <code>386</code> only, defaults to <code>sse2</code>)
|
|
<p>
|
|
This variable controls how gc implements floating point computations.
|
|
</p>
|
|
<ul>
|
|
<li><code>GO386=softfloat</code>: use software floating point operations; should support all x86 chips (Pentium MMX or later).</li>
|
|
<li><code>GO386=sse2</code>: use SSE2 for floating point operations; has better performance but only available on Pentium 4/Opteron/Athlon 64 or later.</li>
|
|
</ul>
|
|
</li>
|
|
|
|
<li><code>$GOARM</code> (for <code>arm</code> only; default is auto-detected if building
|
|
on the target processor, 6 if not)
|
|
<p>
|
|
This sets the ARM floating point co-processor architecture version the run-time
|
|
should target. If you are compiling on the target system, its value will be auto-detected.
|
|
</p>
|
|
<ul>
|
|
<li><code>GOARM=5</code>: use software floating point; when CPU doesn't have VFP co-processor</li>
|
|
<li><code>GOARM=6</code>: use VFPv1 only; default if cross compiling; usually ARM11 or better cores (VFPv2 or better is also supported)</li>
|
|
<li><code>GOARM=7</code>: use VFPv3; usually Cortex-A cores</li>
|
|
</ul>
|
|
<p>
|
|
If in doubt, leave this variable unset, and adjust it if required
|
|
when you first run the Go executable.
|
|
The <a href="//golang.org/wiki/GoArm">GoARM</a> page
|
|
on the <a href="//golang.org/wiki">Go community wiki</a>
|
|
contains further details regarding Go's ARM support.
|
|
</p>
|
|
</li>
|
|
|
|
<li><code>$GOMIPS</code> (for <code>mips</code> and <code>mipsle</code> only) <br> <code>$GOMIPS64</code> (for <code>mips64</code> and <code>mips64le</code> only)
|
|
<p>
|
|
These variables set whether to use floating point instructions. Set to "<code>hardfloat</code>" to use floating point instructions; this is the default. Set to "<code>softfloat</code>" to use soft floating point.
|
|
</p>
|
|
</li>
|
|
|
|
<li><code>$GOPPC64</code> (for <code>ppc64</code> and <code>ppc64le</code> only)
|
|
<p>
|
|
This variable sets the processor level (i.e. Instruction Set Architecture version)
|
|
for which the compiler will target. The default is <code>power8</code>.
|
|
</p>
|
|
<ul>
|
|
<li><code>GOPPC64=power8</code>: generate ISA v2.07 instructions</li>
|
|
<li><code>GOPPC64=power9</code>: generate ISA v3.00 instructions</li>
|
|
</ul>
|
|
</li>
|
|
|
|
|
|
<li><code>$GOWASM</code> (for <code>wasm</code> only)
|
|
<p>
|
|
This variable is a comma separated list of <a href="https://github.com/WebAssembly/proposals">experimental WebAssembly features</a> that the compiled WebAssembly binary is allowed to use.
|
|
The default is to use no experimental features.
|
|
</p>
|
|
<ul>
|
|
<li><code>GOWASM=satconv</code>: generate <a href="https://github.com/WebAssembly/nontrapping-float-to-int-conversions/blob/master/proposals/nontrapping-float-to-int-conversion/Overview.md">saturating (non-trapping) float-to-int conversions</a></li>
|
|
<li><code>GOWASM=signext</code>: generate <a href="https://github.com/WebAssembly/sign-extension-ops/blob/master/proposals/sign-extension-ops/Overview.md">sign-extension operators</a></li>
|
|
</ul>
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
<p>
|
|
Note that <code>$GOARCH</code> and <code>$GOOS</code> identify the
|
|
<em>target</em> environment, not the environment you are running on.
|
|
In effect, you are always cross-compiling.
|
|
By architecture, we mean the kind of binaries
|
|
that the target environment can run:
|
|
an x86-64 system running a 32-bit-only operating system
|
|
must set <code>GOARCH</code> to <code>386</code>,
|
|
not <code>amd64</code>.
|
|
</p>
|
|
|
|
<p>
|
|
If you choose to override the defaults,
|
|
set these variables in your shell profile (<code>$HOME/.bashrc</code>,
|
|
<code>$HOME/.profile</code>, or equivalent). The settings might look
|
|
something like this:
|
|
</p>
|
|
|
|
<pre>
|
|
export GOARCH=amd64
|
|
export GOOS=linux
|
|
</pre>
|
|
|
|
<p>
|
|
although, to reiterate, none of these variables needs to be set to build,
|
|
install, and develop the Go tree.
|
|
</p>
|