「go」golang环境配置for mac

下载

官方的地址被墙，摊手~ 好在可以访问 https://golang.google.cn/

1、将下载好的源码包解压到/usr/local目录，将解压出来的go文件夹拖入/usr/local目录
2、安装包.pkg包直接双击打开，按照指示安装好
3、环境变量配置
打开.bash_profile文件
配置如下

export GOPATH=/usr/local/go
export GOBIN=$GOPATH/bin
export PATH=$PATH:$GOBIN

然后,执行命令

source ~/.bash_profile                     
go version

结果会有警告信息

warning: GOPATH set to GOROOT (/usr/local/go) has no effect
go version go1.14.3 darwin/amd64

看字面意思是将GOPATH 设置成和GOROOT的一样的路径无效
怎么看GOROOT的路径

go env 

warning: GOPATH set to GOROOT (/usr/local/go) has no effect
GO111MODULE=""
GOARCH="amd64"
GOBIN="/usr/local/go/bin"
GOCACHE="/Users/ing/Library/Caches/go-build"
GOENV="/Users/ing/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/usr/local/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/vr/_nlg7k7j5dl5sb5v89bxmgt40000gn/T/go-build004324747=/tmp/go-build -gno-record-gcc-switches -fno-common"

可以看到GOPATH和GOROOT的路径是一样的，至于为什么他俩一样就会警告，
原因在于

go getgo installgo get

所以，修改下GOPATH成你的工作空间
重新配置如下

#Setting PATH for golang
export GOPATH=/Users/ing/Documents/learn/go
export GOROOT=/usr/local/go
export GOBIN=$GOROOT/bin
export PATH=$PATH:$GOBIN

之后

$ go version
go version go1.12.5 darwin/amd64

就正常了