ubuntu-go语言环境变量

1、环境变量GOLANG官网介绍

 

$GOROOT

The root of the Go tree, often $HOME/go. This defaults to the parent of the directory where all.bash is run. If you choose not to set$GOROOT, you must run gomake instead of make or gmake when developing Go programs using the conventional makefiles.

$GOROOT_FINAL

The value assumed by installed binaries and scripts when $GOROOT is not set. It defaults to the value used for $GOROOT. If you want to build the Go tree in one location but move it elsewhere after the build, set $GOROOT_FINAL to the eventual location.

$GOOS and $GOARCH

The name of the target operating system and compilation architecture. These default to the values of $GOHOSTOS and $GOHOSTARCHrespectively (described below).

Choices for $GOOS are linux, freebsd, darwin (Mac OS X 10.5 or 10.6), and windows (Windows, an incomplete port). Choices for $GOARCHare amd64 (64-bit x86, the most mature port), 386 (32-bit x86), and arm (32-bit ARM, an incomplete port). The valid combinations of$GOOS and $GOARCH are:

$GOOS$GOARCH

	darwin	386
	darwin	amd64
	freebsd	386
	freebsd	amd64
	linux	386
	linux	amd64
	linux	arm	incomplete
	windows	386	incomplete

$GOHOSTOS and $GOHOSTARCH

The name of the host operating system and compilation architecture. These default to the local system's operating system and architecture.

Valid choices are the same as for $GOOS and $GOARCH, listed above. The specified values must be compatible with the local system. For example, you should not set $GOHOSTARCH to arm on an x86 system.

$GOBIN

The location where binaries will be installed. The default is $GOROOT/bin. After installing, you will want to arrange to add this directory to your $PATH, so you can use the tools.

$GOARM (arm, default=6)

The ARM architecture version the run-time libraries should target. ARMv6 cores have more efficient synchronization primitives. Setting$GOARM to 5 will compile the run-time libraries using just SWP instructions that work on older architectures as well. Running v6 code on an older core will cause an illegal instruction trap.

Note that $GOARCH and $GOOS identify the target 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 GOARCH to 386, not amd64.

If you choose to override the defaults, set these variables in your shell profile ($HOME/.bashrc, $HOME/.profile, or equivalent). The settings might look something like this

 

export GOROOT=$HOME/go
export GOARCH=386
export GOOS=linux

 

 

2、在ubuntu中配置

 

1)环境变量配置文件

在Ubuntu中有如下几个文件可以设置环境变量
1、/etc/profile:在登录时,操作系统定制用户环境时使用的第一个文件,此文件为系统的每个用户设置环境信息,当用户第一次登录时,该文件被执行。
2、/etc/environment:在登录时操作系统使用的第二个文件,系统在读取你自己的profile前,设置环境文件的环境变量。
3、~/.bash_profile:在登录时用到的第三个文件是.profile文件,每个用户都可使用该文件输入专用于自己使用的shell信息,当用户登录时,该 文件仅仅执行一次!默认情况下,他设置一些环境变游戏量,执行用户的.bashrc文件。/etc/bashrc:为每一个运行bash shell的用户执行此文件.当bash shell被打开时,该文件被读取.
4、~/.bashrc:该文件包含专用于你的bash shell的bash信息,当登录时以及每次打开新的shell时,该该文件被读取。

几个环境变量的优先级

1>2>3

2)开始配置，这里配置为仅本用户使用

 

liuxing@liuxing-O-E-M:~$ gedit ~/.bashrc

在后面加上

 

export GOROOT=$HOME/go

export GOBIN=$GOROOT/bin

export GOARCH=386

export GOOS=linux

export PATH=.:$PATH:$GOBIN

3）

liuxing@liuxing-O-E-M:~$ source ~/.bashrc

liuxing@liuxing-O-E-M:~$ 8g

gc: usage: 8g [flags] file.go...

flags:

  -I DIR search for packages in DIR

  -d print declarations

  -e no limit on number of errors printed

  -f print stack frame structure

  -h panic on an error

  -o file specify output file

  -S print the assembly language

  -V print the compiler version

  -u disable package unsafe

  -w print the parse tree after typing

  -x print lex tokens