$ rm -rf example.app
$ cat main.go
package main

import (
    "fmt"
    "time"
)

func main() {
    for i := 0; i < 5000*1000; i++ {
        go func() {
            fmt.Println("hello")
            time.Sleep(time.Second)
        }()
    }

}

$ gomobile build -target=ios .
gomobile: github.com/rakyll/gom/example does not import "golang.org/x/mobile/app"

$ stat example.app
16777220 152150587 drwxr-xr-x 8 jbd (5000) 0 272 "Sep  4 15:52:31 2015" "Sep  4 15:52:05 2015" "Sep  4 15:52:05 2015" "Sep  4 15:52:04 2015" 4096 0 0 example.app