Can I Set Package Variables in Non-Main Go Packages Using `-ldflags -X`?

Setting Package Variables Using -ldflags -X in Golang Build

When building Go applications using the go build command, developers can set package variables using the -ldflags -X options. This technique is commonly used to inject version strings, configuration values, or other metadata into the compiled binary.

However, the question arises if it's possible to set package variables within a specific package, rather than the main package. Here's how it can be achieved:

The documentation for the -X flag explicitly states:

-X importpath.name=value
Set the value of the string variable in importpath named name to value.

This indicates that the -X flag can be used with any package, not just the main package. To specify a package variable, simply provide the full import path (similar to how you would import the package in your code).

For example, if your config package is located at $GOPATH/src/my/package/config, you can set the Version variable within that package using the following command:

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

This will set the Version variable within the config package, even though the build command is executed in the main package.

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