Notes for XS + go

gistfile1.txt

hello_from_go.go:

```go
package main

import "C"
import "fmt"

//export hello_from_go
func hello_from_go() {
    fmt.Println("Hello from Go")
}

func main() {}
```

Makefile.PL:

```perl
use 5.016;
use ExtUtils::MakeMaker;
WriteMakefile(
  NAME   => 'hello',
  VERSION_FROM => 'hello.pm',
  LIBS => ['-L/home/pmartini/tmp -lhello_from_go'],
);
```

hello.pm:

```perl
package hello;
require Exporter;
our $VERSION = '0.01';
our @ISA = qw(Exporter);
require XSLoader;
XSLoader::load('hello', $VERSION);
1;
```

Commands:

```
pmartini@pmlinlaptop:~/tmp$ go build -buildmode=c-shared -o libhello_from_go.so hello_from_go.go
pmartini@pmlinlaptop:~/tmp$ perl Makefile.PL
pmartini@pmlinlaptop:~/tmp$ make
pmartini@pmlinlaptop:~/tmp$ perl -Mblib -Mhello -e 'hello::xsgo'