This question already has an answer here:
Here are two .go files.
├── lib.go
└── main.go
The lib.go has a package libtest.
$ cat lib.go
package libtest
import (
"fmt"
)
func TestLibFunc() {
fmt.Println("This is test library function")
}
The main.go has a package main.
$ cat main.go
package main
import (
"libtest"
)
func main() {
libtest.TestLibFunc()
}
When I tried to build them, but it's failed.
$ go build *.go
can't load package: package main: found packages libtest (lib.go) and main (main.go) in /Users/dev/work/tmp/local-package
How can I use local packages in main package?
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You need to put each package in a separate sub-directory. So your directory structure so put lib.go in project/lib and main.go in project/cmd. It should then work.
First of all create a separate package libtest and put lib.go there. Then you should give the full path of libtest otherwise your import right now searches for $GOPATH/src/libtest or /usr/local/Cellar/go/<version> which doesn't exist.
So you should give import project/libtest