IPreprocessBuild.OnPreprocessBuild

public void OnPreprocessBuild (BuildTarget target, string path);

Description

Implement this function to receive a callback before the build is started.

using UnityEditor;
using UnityEditor.Build;
using UnityEngine;

class MyCustomBuildProcessor : IPreprocessBuild
{
    public int callbackOrder { get { return 0; } }
    public void OnPreprocessBuild(BuildTarget target, string path)
    {
        Debug.Log("MyCustomBuildProcessor.OnPreprocessBuild for target " + target + " at path " + path);
    }
}