Using Go on existing C project

Question

I have a program entirely written in C that uses multiple object (.o) files in it. These files are all packed inside an archive file (.a) which, in

Answer 1

This may not be what you want, but in Go 1.5, that's coming this August, you'll be able to build C-compatible libraries with the go tool. So with this in your _main.c

#include 

int main()
{
    char *string_to_pass = NULL;
    if (asprintf(&string_to_pass, "This is a test.") < 0) {
        printf("asprintf fail");
        return -1;
    }

    PrintString(string_to_pass);
    return 0;
}

and this in your main.go

package main

import "C"
import "fmt"

//export PrintString
func PrintString(cs *C.char) {
    s := C.GoString(cs)
    fmt.Println(s)
}

func main() {}

You can do, for static library:

go build -buildmode c-archive -o mygopkg.a
gcc -o main _main.c mygopkg.a -lpthread

For shared library:

go build -buildmode c-shared -o mygopkg.so
LD_RUN_PATH=$(pwd) gcc -o main _main.c mygopkg.so -lpthread

(LD_RUN_PATH is here to make the linker look for the shared library in the same directory you're building.)

See the Go execution modes design document for more info.