Failed to Build for Android on Go v1.23.1 Using anet Package

[Ja7ad]

Hello, Thank you for your package.

I'm encountering a build error when attempting to compile a Go project targeting Android (GOOS=android, GOARCH=arm64) using the anet package. The following code reproduces the issue:

package main

import (
	"fmt"
	"log"
	"github.com/wlynxg/anet"
)

func main() {
	i, err := anet.Interfaces()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(i)
}

Command used:

CGO_ENABLED=0 GOOS=android GOARCH=arm64 go build -ldflags "-s -w -checklinkname=0" main.go

Error:

# command-line-arguments
./main.go:10:17: undefined: anet.Interfaces

It appears the anet.Interfaces function is not available during the build process. This issue might be related to how the package handles platform-specific code.

Environment:

• Go version: 1.23.1
• Target platform: Android (ARM64)
• Package: anet (latest version)

Any insights or solutions would be appreciated.

[wlynxg]

In order to automatically obtain the Android version number, CGO is used in the Android code.
The code is at:

anet/interface_android.go

Line 3 in a79b5ca

// #include <android/api-level.h>

[wlynxg]

Perhaps we should support manually setting the Android version without using CGO? @bobrofon

[Ja7ad]

In order to automatically obtain the Android version number, CGO is used in the Android code. The code is at:

anet/interface_android.go

Line 3 in a79b5ca

// #include <android/api-level.h>

We build android version on older version of go, without any issue on build.

https://github.com/pactus-project/pactus/releases/tag/v1.4.0

Package used:

• https://github.com/pactus-project/pactus/blob/a505f9c07f840ed8d5c1c862851cfa55c0176401/go.mod#L137C2-L137C27

• https://github.com/pion/transport/blob/ea4fc430cce8423896e78100736a61f3712f053d/go.mod#L8

[bobrofon]

We build android version on older version of go, without any issue on build.

I reproduced the same build error on go 1.22.7. It doesn't seem that the go version is relevant.

[b00f]

It make sense, since I can't see anet in older version of Pactus here
This way we can't support Android anymore!?

[bobrofon]

This way we can't support Android anymore!?

There is an open PR #8 fixing this issue.
Or you can just build Pactus with anet from this commit 4d6caa2. It should work as well.

[b00f]

Thanks for the quick response and for promptly fixing the issue.