go - 使用cmd/进行go构建的奇怪行为

Question

Go build命令不会创建相同的二进制文件，而cmd /是错误的:
首先确定(〜/ go /前为空):

$ find .
.  
./cmd  
./cmd/api  
./cmd/api/main.go  

我建立 :

$ cd cmd/api; go build -v main.go   
 get "gopkg.in/yaml.v2": found meta tag get.metaImport{Prefix:"gopkg.in/yaml.v2", VCS:"git", RepoRoot:"https://gopkg.in/yaml.v2"} at //gopkg.in/yaml.v2?go-get=1   
 get "golang.org/x/sys": found meta tag get.metaImport{Prefix:"golang.org/x/sys", VCS:"git", RepoRoot:"https://go.googlesource.com/sys"} at //golang.org/x/sys?go-get=1  
 get "gopkg.in/check.v1": found meta tag get.metaImport{Prefix:"gopkg.in/check.v1", VCS:"git", RepoRoot:"https://gopkg.in/check.v1"} at //gopkg.in/check.v1?go-get=1  
 get "golang.org/x/text": found meta tag get.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at //golang.org/x/text?go-get=1  
 get "golang.org/x/tools": found meta tag get.metaImport{Prefix:"golang.org/x/tools", VCS:"git", RepoRoot:"https://go.googlesource.com/tools"} at //golang.org/x/tools?go-get=1   
 go: downloading github.com/gin-gonic/gin v1.6.3   
 etc ....    
 go: finding golang.org/x/sys v0.0.0-20200116001909-b77594299b42  

结果 :

$ ls -l  
    total 14940   
    -rwxr-xr-x 1 fr3 nobody 15290667 May 12 14:00 main   
    -rw-r--r-- 1 fr3 nobody      619 May 12 13:41 main.go   

现在使用cmd /:

$ find .
.  
./cmd   
./cmd/api  
./cmd/api/main.go  

我使用mod命令:

$ go mod init api  
go: creating new go.mod: module api   
$ go mod vendor   
go: finding github.com/gin-gonic/gin v1.6.3   
go: downloading github.com/gin-gonic/gin v1.6.3   
etc ....   
go: extracting github.com/go-playground/locales v0.13.0   

供应商/已创建:

 ls -l   
 total 16   
  drwxr-xr-x 3 fr3 nobody 4096 May 12 13:42 cmd   
  -rw-r--r-- 1 fr3 nobody   61 May 12 14:07 go.mod  
  -rw-r--r-- 1 fr3 nobody 3872 May 12 14:07 go.sum   
  drwxr-xr-x 5 fr3 nobody 4096 May 12 14:07 vendor   
$ mkdir target  
 go build  -o target/api cmd/api   
$ ls -l target/
total 5912   
-rwxr-xr-x 1 fr3 nobody 6052601 May 12 14:08 api

Answer 1

cd cmd/api; go build -v main.go

这不是 go build的使用方式。像大多数 go build命令一样， go适用于软件包，而不适用于文件。因此，您可以:

cd cmd/api; go build -v .

或者，从项目的根源开始:

go build -v ./cmd/api

这将在工作目录中产生一个以程序包命名的二进制文件。您还可以使用 -o标志(请参阅文档)选择要输出的二进制名称和路径。