Cannot find package for shared library - go

Question

I am trying to use a shared library in go-lang, I am following this blog post: http://blog.ralch.com/tutorial/golang-sharing-libraries/
But when I hit build I get back an error:
simo#simo:~/gopath$ go build -linkshared -o app effe/prova
src/effe/prova/prova.go:3:8: cannot find package "libmath" in any of:
/usr/local/go/src/libmath (from $GOROOT)
/home/simo/gopath/src/libmath (from $GOPATH)
I am pretty new to go, so I will show also my environment...
simo#simo:~/gopath$ pwd
/home/simo/gopath
simo#simo:~/gopath$ echo $GOPATH
/home/simo/gopath
simo#simo:~/gopath$ tree
.
├── pkg
│   └── linux_amd64_dynlink
│   ├── effe
│   │   ├── libmath.a
│   │   └── libmath.shlibname
│   └── libeffe-libmath.so
└── src
└── effe
├── libmath
│   └── libmath.go
└── prova
└── prova.go
7 directories, 5 files
simo#simo:~/gopath$ cat src/effe/libmath/libmath.go
// filename: libmath.go
package libmath
func Sum(x, y int) int {
return x + y
}
simo#simo:~/gopath$ cat src/effe/prova/prova.go
package main
import "libmath"
import "fmt"
func main() {
fmt.Printf("5 op 10 => %d", libmath.Sum(5, 10))
}
simo#simo:~/gopath$ go install -buildmode=shared -linkshared effe/libmath
simo#simo:~/gopath$ go build -linkshared -o app effe/prova
src/effe/prova/prova.go:3:8: cannot find package "libmath" in any of:
/usr/local/go/src/libmath (from $GOROOT)
/home/simo/gopath/src/libmath (from $GOPATH)
What am I doing wrong ?

Answer 1

The import path for "libmath" is "effe/libmath".
Try to get your build working in the standard build mode before experimenting with more complicated build and execution modes.