What does it mean to use the 'go' version directive in a go module file (go.mod)

Using the "go" version directive in the go module file (go.mod) is a special directive in the Go language. Its function is to specify the Go language version used by the project. . In the go.mod file, we can explicitly tell the compiler which version of Go we wish to use by writing a directive like "go 1.15". The meaning of this instruction is to use the specified Go language version to compile and build the project. By explicitly specifying the Go version, we can ensure the stability and compatibility of the project, and can take advantage of new features and performance optimizations brought by new versions. During the project development process, the reasonable use of "go" version instructions is very important to ensure the operational stability and performance optimization of the project.

Question content

Given the following go.mod file:

module foo

go 1.12

require (
    github.com/bar/baz v1.0.0
    github.com/rat/cat v1.0.0
)

go 1.12 What does it mean? Will it prevent the foo module from being compiled against any other version of go? Or is it just an indicator of the foo recommended/required go version? Is this a directive we should update when a new version of go is released (every 6 months)?

Solution

should be considered in terms of the minimum required Go version. If you're building with the same or higher version of Go, everything should follow the Go 1 Compatibility Promise一个>. If you build with an older version, if the build fails, an error message will appear:

go directives in go.mod files now indicate the language version used by files in that module. If no existing version exists, it will be set to the current version (go to 1.12). If a module's go directive specifies a newer version than the toolchain being used, the go command will attempt to build the package and will only notice the mismatch if the build fails. Go 1.12 Release Notes

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