Ubuntu-go Language Environment variables

This is a creation in Article, where the information may have evolved or changed.

1, environment variable Golang official website Introduction

$GOROOT

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

$GOROOT_FINAL

The value assumed by installed binaries, and scripts when are not

$GOROOT set. It defaults to the value used for $GOROOT . If you want to build the Go tree on one location but move it elsewhere after the build, set to the $GOROOT_FINAL eventual Locati On.

$GOOSand $GOARCH

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

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

$GOOS $GOARCH

	darwin	386
	darwin	amd64
	freebsd	386
	freebsd	amd64
	linux	386
	linux	amd64
	linux	arm	Incomplete
	windows	386	Incomplete

$GOHOSTOSand $GOHOSTARCH

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

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

$GOBIN

The location

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

$GOARM(ARM, Default=6)

The

ARM architecture version The Run-time libraries should target. ARMV6 cores has more efficient synchronization primitives. Setting to $GOARM 5 would compile the Run-time libraries using just SWP instructions that work on older architectures as we LL. Running V6 code on an older core would cause an illegal instruction trap.

$GOARCH  and  $GOOS  identify the  target  environment, not the environment is running on. In effect, your is always cross-compiling. By architecture, we mean the kind of binaries, the target environment can Run:an x86-64 system running a 32-bit-only Operating system must set 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

Export goroot= $HOME/goexport goarch=386export goos=linux

2. Configure in Ubuntu

1) environment variable configuration file

InUbuntuYou can set environment variables in the following files
1、/etc/profile:When you log on,The first file used by the operating system to customize the user environment,This file sets the environment information for each user of the system,When a user logs on for the first time,The file is executed.
2、/etc/environment:The second file that the operating system uses when logging on,The system is reading your own ProfileAgo,Set environment variables for environment files.
3、~/.bash_profile:The third file to use when you log in is. profileFile,Each user can use this file to enter a specificShellInformation,When a user logs on,The file executes only once!By default,He set some environment to change the game amount,Executes the user's. BASHRCFile./ETC/BASHRC:For each runBash ShellThe user executes this file.WhenBash ShellWhen it is opened,The file is read.
4、~/.BASHRC:This file contains the files dedicated to yourBash ShellOfBashInformation,When you log on and each time you open a newShellWhen,The file is read.

Priority of several environment variables

1>2>3

2) Start the configuration, which is configured for use only by this user

liuxing@liuxing-o-e-m:~$ gedit ~/.BASHRC

Add in the back

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