Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

Danilos-MacBook-Pro:golibdemo danilolr$ go version
go version go1.7.3 darwin/amd64

What operating system and processor architecture are you using (go env)?

Danilos-MacBook-Pro:golibdemo danilolr$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/danilolr/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.7.3/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.7.3/libexec/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/ry/l4yf7vwd5rbdydhtn03qfmnm0000gn/T/go-build870546491=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"

What did you do?

I create a new package to be used as a gomobile library.
The package contains only one file (golibdemo.go) with this content :

package golibdemo

import "fmt"

type GoLibDemo struct {
}

func main() {
d := GoLibDemo{}
fmt.Println(d)
}

Then I execute the command :

gomobile bind -target android

What did you expect to see?

The .aar file build.

What did you see instead?

A error message and a zero size aar file :

Danilos-MacBook-Pro:golibdemo danilolr$ gomobile bind -target android
gomobile: javac -d /var/folders/ry/l4yf7vwd5rbdydhtn03qfmnm0000gn/T/gomobile-work-713371376/javac-output -source 1.7 -target 1.7 -bootclasspath /Users/danilolr/Library/Android/sdk/platforms/android-24/android.jar go/LoadJNI.java go/Seq.java go/Universe.java go/error.java golibdemo/Golibdemo.java failed: exit status 1
golibdemo/Golibdemo.java:9: error: class GoLibDemo is public, should be declared in a file named GoLibDemo.java
public final class GoLibDemo implements Seq.Proxy {
^
./golibdemo/Golibdemo.java:9: error: class GoLibDemo is public, should be declared in a file named GoLibDemo.java
public final class GoLibDemo implements Seq.Proxy {
^
golibdemo/Golibdemo.java:10: error: cannot access Golibdemo
static { Golibdemo.touch(); }
^
bad source file: ./golibdemo/Golibdemo.java
file does not contain class golibdemo.Golibdemo
Please remove or make sure it appears in the correct subdirectory of the sourcepath.
3 errors

Danilos-MacBook-Pro:golibdemo danilolr$ ls -l
total 8
-rw-r--r-- 1 danilolr staff 0 Jan 17 17:09 golibdemo.aar
-rw-r--r-- 1 danilolr staff 110 Jan 17 16:51 golibdemo.go
Danilos-MacBook-Pro:golibdemo danilolr$

Please say me more

The problem only happens when building the library to android on OSX.
I am able to build it to android on linux and to iOS on OSX.