Can Go 1.5\'s Dynamic Linking Enhance Existing Binaries with External Code?

Unlock Dynamic Linking from a Go Binary

Enhancing a Go binary with custom code through dynamic linking eliminates the need to rebuild the entire binary. This guide explores the possibility of achieving this feat, leveraging the latest advancements in Go 1.5.

The Challenge: Compiling and Linking External Code

The objective is to compile an external Go file from within an existing Go binary and link it into the binary's execution environment. This allows for the seamless integration of new functionality without recompiling the entire executable.

The Answer: Go 1.5's Dynamic Linking Support

The long-awaited feature of shared libraries has finally arrived with Go 1.5. This groundbreaking release empowers developers to build Go shared libraries that can be consumed by Go programs.

Step 1: Building Standard Library as Shared Libraries

To create shared libraries, utilize the -buildmode=shared flag during go install. For instance, to build the standard library as shared libraries, enter:

$ go install -buildmode=shared std

Step 2: Building a Program Linked to Shared Libraries

Create a "Hello, world" program that links against the standard library's shared libraries:

$ go build -linkshared hello.go

Step 3: Inspecting the Shared Library Binary

Once the build is complete, run ls -l on the binary to verify the changes:

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

Conclusion

With the introduction of dynamic linking in Go 1.5, the dream of seamlessly integrating external Go code into existing binaries becomes a reality. This opens up a wide range of possibilities for modular software development and code reuse.

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