How Can I Dynamically Compile and Link External Go Code into a Go Binary at Runtime?

Compiling and Linking Dynamically from a Go Binary

In this scenario, we have an existing Go binary that requires the compilation and linking of an external Go file at runtime. The goal is to dynamically load the compiled code into the binary for subsequent use.

In previous versions of Go, this process was not supported. However, with the introduction of Go 1.5, the creation and linking of shared libraries became possible.

As stated in the "The State of Go" talk by Andrew Gerrand:

Shared Libraries in Go 1.5

• Go 1.5 enables the creation of Go shared libraries that can be imported and used by other Go programs.
• To build the standard library as shared libraries:

$ go install -buildmode=shared std

• To build a program that links against the shared libraries:

$ go build -linkshared hello.go
$ ls -l hello
-rwxr-xr-x 1 adg adg 13926 May 26 02:13 hello

With Go 1.5, the compiled code from the external Go file can be dynamically loaded into the binary by including the following code:

package main

import (
    "fmt"
    "syscall"
)

func main() {
    // Load the external shared library
    lib, err := syscall.LoadLibrary("myexternallibrary.so")
    if err != nil {
        panic(fmt.Sprintf("Error loading library: %v", err))
    }
    defer syscall.FreeLibrary(lib)
    
    // Get the function pointer from the library
    sym, err := syscall.GetProcAddress(lib, "runFoo")
    if err != nil {
        panic(fmt.Sprintf("Error getting function pointer: %v", err))
    }

    // Execute the function
    _, _, err = syscall.Syscall(sym, 0, 0, 0, 0)
    if err != nil {
        panic(fmt.Sprintf("Error calling function: %v", err))
    }
}

In the provided code, "myexternallibrary.so" is the name of the shared library containing the "runFoo" function. This approach allows us to dynamically compile and link external Go code into an existing binary at runtime, resolving the initial problem.

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