Mac App Store：放弃32位支持赞成ARC，现有的32位版本的用户看到更新消息？

问题描述

我正在考虑删除32位支持，以支持自动引用计数（仅支持64位二进制文​​件）。

I'm considering dropping 32-bit support for in favor for Automatic Reference Counting (which is only supported for 64 bit binaries).

我想请使用Mac App Store避免这两种情况：

I'd like to avoid these two scenarios with the Mac App Store:

对于旧的32位Mac 的用户：

For a user of an old 32-bit Mac:

1. 谁购买了32位支援的旧版本：他们会在Mac应用程式中看到应用程式的更新讯息商店？

1. who did purchase the previous version with 32-bit support: Will they see an update message for the app in the Mac App Store? If so, the (now 64 bit only) update would not work for him/her.

尚未购买应用程式的使用者：

who has not purchased the app before: will they be able to purchase the app although it will not run on their system?

ARC 64位元：

ARC 64 bit only:http://developer.apple.com/library/mac/#releasenotes/ObjectiveC/RN-TransitioningToARC/_index.html#//apple_ref/doc/uid/TP40011226

编辑：
我发现一次有人能够下载一个64位的唯一应用程序到32位的MacBook，并显示一个错误信息无法完成购买。在这种情况下，它是一个免费的应用程序。我不知道何时会在付费应用程式（付款前后）显示此讯息。

I found one occasion of somebody being able to download a 64 bit only app to a 32 bit MacBook and being presented with an error message "Your purchase could not be completed". In this case it was a free app. I wonder when this message would pop up for a paid app (before or after the payment).

推荐答案

我还发现ARC需要64位处理器。但是，我设法构建一个胖二进制64位版本使用ARC和32位版本使用垃圾收集器。为此，我必须执行以下操作：

I've also found out that ARC requires 64bit processors. However, I managed to build a fat binary where the 64bit version uses ARC and the 32bit version uses the garbage collector. To do this I had to do the following:

• 设置仅使用GC的32位目标


• 
  
• 添加32位目标作为64位目标的依赖


• 添加自定义构建阶段使用 lipo 从两个目标中的二进制文件汇编一个胖二进制文件的shell脚本

• set up a 32bit only target that uses GC
• set up a 64bit only target that uses ARC
• add the 32bit target as a dependency to the 64bit target
• add a custom build phase with a shell script that uses lipo to assemble a fat binary from the binaries in the two targets

两个目标使用相同的源，但是有必要使用一些 #ifdef __OBJC_GC __ 语句。我确实不得不放弃合成的ivars为向后兼容性：（

Both targets use the same source, but a few #ifdef __OBJC_GC__ statements were necessary. I did have to give up synthesized ivars for backward compatibility :(

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