mirror of
https://github.com/golang/go
synced 2024-11-18 03:04:45 -07:00
afe50c1196
This change updates the GOARCH/GOOS discussion at the top of the "Installing Go from source" document to better reflect the current status. In particular: - The GOARCH list now focuses on simply listing the supported architectures, with no notes about their supposed "maturity", since the same GOARCH can be mature on a GOOS and not so mature on another. - Outdated notes about some archs being new and "not well-exercised" have been removed in favour of a following list of which ports are first class. - The list of supported OS has been updated (added: AIX, Illumos), and sorted in alphabetical order. - A note about the runtime support being the same for all ARCHS, "including garbage collection and efficient array slicing and" etc etc has been removed, since it doesn't seem particularly relevant in a "install from source" instruction page, and it's likely a leftover from the time this doc page was the landing place for new people and it felt the need to "sell" Go. Updates #27689 Fixes #35009 Change-Id: Ic4eca91dca3135adc7bed4fe00b4f157768f0e81 Reviewed-on: https://go-review.googlesource.com/c/go/+/202197 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
758 lines
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758 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 twelve 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>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>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>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>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</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 an existing Go tool
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chain in <code>$GOROOT_BOOTSTRAP</code>.
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If unset, the default value of <code>GOROOT_BOOTSTRAP</code>
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is <code>$HOME/go1.4</code>.
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</p>
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<p>
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There are many options for the bootstrap toolchain.
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After obtaining one, set <code>GOROOT_BOOTSTRAP</code> to the
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directory containing the unpacked tree.
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For example, <code>$GOROOT_BOOTSTRAP/bin/go</code> should be
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the <code>go</code> command binary for the bootstrap toolchain.
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</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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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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<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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|
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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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<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
|
|
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>
|
|
</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>$GOROOT</code>.
|
|
If you want to build the Go tree in one location
|
|
but move it elsewhere after the build, set
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<code>$GOROOT_FINAL</code> to the eventual location.
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</p>
|
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</li>
|
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|
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<li id="gopath"><code>$GOPATH</code>
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|
<p>
|
|
The directory where Go projects outside the Go distribution are typically
|
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checked out. For example, <code>golang.org/x/tools</code> might be checked out
|
|
to <code>$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>$GOBIN</code>
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|
<p>
|
|
The directory where executables outside the Go distribution are installed
|
|
using the <a href="/cmd/go">go command</a>. For example,
|
|
<code>go get golang.org/x/tools/cmd/godoc</code> downloads, builds, and
|
|
installs <code>$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> (macOS 10.11 and above and iOS),
|
|
<code>dragonfly</code>, <code>freebsd</code>, <code>illumos</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>386</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>arm</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>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>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>$GO386</code> (for <code>386</code> only, default is auto-detected
|
|
if built on either <code>386</code> or <code>amd64</code>, <code>387</code> otherwise)
|
|
<p>
|
|
This controls the code generated by gc to use either the 387 floating-point unit
|
|
(set to <code>387</code>) or SSE2 instructions (set to <code>sse2</code>) for
|
|
floating point computations.
|
|
</p>
|
|
<ul>
|
|
<li><code>GO386=387</code>: use x87 for floating point operations; should support all x86 chips (Pentium MMX or later).</li>
|
|
<li><code>GO386=sse2</code>: use SSE2 for floating point operations; has better performance than 387, but only available on Pentium 4/Opteron/Athlon 64 or later.</li>
|
|
</ul>
|
|
</li>
|
|
|
|
<li><code>$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>
|