dongzhuji1042 2015-07-06 18:10
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在go包中获取make文件变量?

I have a variable VERSION in a make file that sets the version for binary at compile time using -ldflags

VERSION = $(strip $(TIMESTAMP))
LDFLAGS = -ldflags "-X main.buildTime $(BUILD_TIME) -X main.buildNumber $(VERSION)"

Now I want to get the VERSION in a package which is not main and print it. I tried bunch of options, but not able to make it work.

My question is how can I get it in the package and then print it to client at run time, such as you are connected to app version 2.0..??

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  • du6333137 2015-07-06 19:57
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    Directory structure:

    - main.go
    - test/
      - test.go
    

    test.go

    package test
    
    var Version = ""
    

    main.go

    package main
    
    import (
        "fmt"
        "test"
    )
    
    func main() {
        fmt.Println(test.Version)
    }
    

    Finally, run:

    go run -ldflags="-X test.Version 2.0.0" main.go
    

    Outputs:

    > 2.0.0
    

    Since we can specify import path, we can set the value of a string everywhere, not only in main.

    From go 1.5 up, syntax is changed to importpath.name=string.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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