How to Integrate Go Functions into Existing C Projects Using GCCGO?

Using Go Within Existing C Projects

Background:
You have a C program comprised of multiple object files stored in an archive file (.a). You intend to add a new Go file to the project, compile it into an object file, and incorporate it into the existing archive.

Objective:
Integrate Go functions into your C program.

Process:

1. Compile the Go File into an Object File:

• Run the following command:

2. Call Go Functions from C:

• In your c_caller.c file, declare an extern function:

• In the main function, call the Go function and handle the result:

3. Using GCCGO to Build the Entire Project:

• Run the following command:

4. Addressing Errors:

• If you encounter errors like "undefined reference to main.main", ensure that you have a main function in your C code.
• If you encounter errors like "cannot find -lgo," verify that the LD_LIBRARY_PATH environment variable is set to point to the folder where libgo.so is located.

Alternative Solution in Go 1.5:

In Go 1.5 (coming in August), a new feature enables the creation of C-compatible libraries from Go code. With this feature, you can build a static or shared library directly from a Go file, eliminating the need for intermediate object files.

Example:

• In main.c:

• In main.go (compiled with go build -buildmode c-archive ... for static or go build -buildmode c-shared ... for shared library):

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