How Can I Dynamically Link External Go Code into an Existing Go Binary?

Dynamic Linking in Go Binaries

Problem:

Consider a scenario where you have an existing Go binary and need to add functionality by compiling an external Go file. Once compiled, you want to integrate this new code into the binary without rebuilding the entire application.

Solution:

In Go 1.5 and later, it is now possible to build and link shared libraries dynamically. Here's how you can achieve your desired functionality:

• Creating Shared Libraries:

$ go install -buildmode=shared std

This command builds the standard library as shared libraries.

• Compiling External Go File:

Compile the external Go file as follows:

$ go build -linkshared hello.go

• Linking Shared Library:

Once the external Go file is compiled, it can be linked into the existing binary using the -linkshared flag:

$ go install -linkshared mybinary.go

• Usage:

Within the existing binary, you can now call the newly compiled code like any other function defined in the binary itself.

Example:

package main

import (
    "fmt"
    "github.com/myimportpath/mypackage"
)

func main() {
    fmt.Println("Before calling compiled code")
    mypackage.RunFoo()
    fmt.Println("After calling compiled code")
}

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