golang-101-hacks(4)——go build”和 go install
golang-101-hacks(4)——go build”和 go install
查看当前$GOPATH目录结构，只展开src源码目录
Let's tidy up the$GOPATH directory and only keep Go source code files left over:
# tree
.
├── bin
├── pkg
└── src
├── greet
│ └── greet.go
└── hello
└── hello.go
5 directories, 2 files在源码greet包的greet.go文件中只有一个函数
# cat src/greet/greet.go
package greet
import "fmt"
func Greet() {
fmt.Println("Hello 中国!")
}虽然hello.go是一个main利用的包，greet可以构建到可执行的二进制文件中：
# cat src/hello/hello.go
package main
import "greet"
func main() {
greet.Greet()
}进入src/hello目录 执行go build命令 (1) Enter the src/hello directory, and execute go build command:
# pwd
/root/gowork/src/hello
# go build
# ls
hello hello.go
# ./hello
Hello 中国!我们可以看到在当前目录中创建了一个新的hello命令。
We can see a fresh hello command is created in the current directory.
查看$GOPATH目录
Check the $GOPATH directory:
# tree
.
├── bin
├── pkg
└── src
├── greet
│ └── greet.go
└── hello
├── hello
└── hello.go
5 directories, 3 files除了go build，还有另外一个终极命令 Compared before executing go build, there is only a final executable command more. (2) Clear the $GOPATH directory again:
# tree
.
├── bin
├── pkg
└── src
├── greet
│ └── greet.go
└── hello
└── hello.go
5 directories, 2 files在hello目录下运行go install Running go install in hello directory:
# pwd
/root/gowork/src/hello
# go install
#Check the $GOPATH directory now:
# tree
.```
├── bin
│ └── hello
├── pkg
│ └── linux_amd64
│ └── greet.a
└── src
├── greet
│ └── greet.go
└── hello
└── hello.go
6 directories, 4 files不仅在bin目录中生成hello命令，而且在pkg/linux_AMd64中还生成了greet.a。而SRC文件夹没有任何变化，只包含源代码。
(3) There is -i flag in go build command which will install the packages that are dependencies of the target, but won't install the target. Let's check it:
# tree
.
├── bin
├── pkg
└── src
├── greet
│ └── greet.go
└── hello
└── hello.go
5 directories, 2 filesRun go build -i under hello directory:
# pwd
#/root/gowork/src/hello
# go build -i
Check $GOPATH now:
# tree
.
├── bin
├── pkg
│ └── linux_amd64
│ └── greet.a
└── src
├── greet
│ └── greet.go
└── hello
├── hello
└── hello.go除了src/hello目录中的hello可执行文件外，也会在pkg/linux_amd64目录下生成的greet.a依赖库文件。 默认情况下，go build以当前目录的名作为编译后的二进制文件的名，要修改二进制文件名，可以使用-o标记
# pwd
/root/gowork/src/hello
# go build -o he
# ls
he hello.go可执行文件名称有hello变成了he