Can Go's `-ldflags -X` Assign Variables to Packages Other Than `main`?

Package Variable Assignment with -ldflags -X in Go Build

Problem:

When building a Go application, is it feasible to assign a version string variable to a package other than the main package using the -ldflags -X options?

Solution:

Yes, it is possible to set a variable in any package using -ldflags -X. However, it requires specifying the full import path of the package, not just the package name.

To achieve this, use the following syntax:

-X importpath.package.variable=value

For example, if the config package is located at $GOPATH/src/my/package/config, use the following build command:

go build -ldflags "-X my/package/config.Version=1.0.0" -o $(MY_BIN) $(MY_SRC)

This command will assign the value 1.0.0 to the Version variable in the config package.

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