导入Google Ads插件后，Unity 2017.3.0f3构建iOS项目卡于Converting managed assemblies to C++

I’ve dealt with this exact frustrating hang in Unity 2017.3.0f3 when integrating Google Ads before—let’s walk through the fixes that worked for me and other developers:

• Use a Google Ads Plugin Version Compatible with Unity 2017.x
  Unity 2017.3 is an older release, and many recent Google Ads plugins drop support for it. Look for a plugin version that explicitly lists Unity 2017.x in its release notes. First, uninstall your current plugin (delete all Assets/GoogleMobileAds files), then import the compatible version.

• Tweak IL2CPP Build Settings
  Navigate to Edit > Project Settings > Player > Other Settings > Configuration:

  • Ensure Scripting Backend is set to IL2CPP
  • Under IL2CPP Code Generation Options, select Faster (smaller) builds
  • Try setting Managed Stripping Level to Medium or High—this reduces the number of assemblies being converted, which often resolves the hang

• Clear Unity’s Cache and Temp Files
  Corrupted cache files are a common culprit. Close Unity completely, then delete these folders:

  • <YourProjectPath>/Library
  • <YourProjectPath>/Temp
  • %USERPROFILE%/AppData/Local/Unity/Cache (Windows) or ~/Library/Caches/Unity (Mac)
    Restart Unity and attempt the build again.

• Check for Plugin Conflicts
  Other ad SDKs or third-party libraries might clash with Google Ads. Temporarily remove any other ad mediation tools or SDKs, then try building. If it succeeds, you’ll need to find compatible versions of the conflicting plugins or adjust their integration settings.

• Force a Full Asset Reimport
  Go to Assets > Reimport All in Unity. This ensures all plugin files are properly processed and linked, fixing hidden import issues that can stall the IL2CPP conversion.

• Verify iOS Build Configuration
  For iOS targets:

  • Set Target SDK to Device SDK (if building for a physical device) instead of Simulator SDK
  • Ensure Architecture is set to Universal or the specific architecture you need—mismatched settings can cause the assembly conversion to hang indefinitely

If none of these steps work, try creating a fresh Unity project, import only the Google Ads plugin, and build an iOS project. If that works, gradually migrate your existing assets into the new project to isolate the root cause.

内容的提问来源于stack exchange，提问作者Hamza Azmat