doujian0265 2014-10-13 10:10
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Golang构建约束随机

I have two go files with different build constraints in the header.

constants_production.go:

// +build production,!staging

package main

const (
  URL               = "production"
)

constants_staging.go:

// +build staging,!production

package main

const (
  URL               = "staging"
)

main.go:

package main

func main() {
  fmt.Println(URL)
}

When I do a go install -tags "staging", sometimes, it prints production; Sometimes, it prints staging. Similarly, when I do go install -tags "production",...

How do I get a consistent output on every build? How do I make it print staging when I specify staging as a build flag? How do I make it print production when I specify production as a build flag? Am I doing something wrong here?

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1条回答 默认 最新

  • dongyi2006 2014-10-13 10:35
    关注

    go build and go install will not rebuild the package (binary) if it looks like nothing has changed -- and it's not sensitive to changes in command-line build tags.

    One way to see this is to add -v to print the packages as they are built:

    $ go install -v -tags "staging"
    my/server
    $ go install -v -tags "production"
    (no output)
    

    You can force a rebuild by adding the -a flag, which tends to be overkill:

    $ go install -a -v -tags "production"
    my/server
    

    ...or by touching a server source file before the build:

    $ touch main.go
    $ go install -a -tags "staging"
    

    ...or manually remove the binary before the build:

    $ rm .../bin/server
    $ go install -a -tags "production"
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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