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We can see apple announcement here.. According to this doc, we can submit same binary with supporting 32-bit and also 64-bit. I found one stack overflow answer here. But According to this answer, we should set deployment target as IO7+. But apple doc said, you can submit this with IOS 7 and IOS 6 support? My question is, How can we generate binary with supporting 32-bit and 64-bit by deployment target IOS6+?
Note: I'm using xcode 5.0
Update: Question above is fixed by using xcode 5.0.2. But I get confused how can I make code for 32-bit as well 64-bit. I know one thing, we must do code for two separately in some times. But How can I do?. for example, if one method in deprecated in ios6 means, we provide code for ios 6 and ios7 also. In same case also followed here or do some other technic for this.
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As its name suggests, the 32 bit OS can store and handle lesser data than the 64 bit OS. More specifically, it addresses a maximum of 4,294,967,296 bytes (4 GB) of RAM. The 64 bit OS, on the other hand, can handle more data than the 32 bit OS.
The 64-bit versions of Windows don't provide support for 16-bit binaries or 32-bit drivers. Programs that depend on 16-bit binaries or 32-bit drivers can't run on the 64-bit versions of Windows unless the program manufacturer provides an update for the program.
As far as I know, the same approach should work for 32 on 64 and for 64 on 32. Just change dpkg --add-architecture i386 to dpkg --add-architecture amd64 .
What Are 32-Bit and 64-Bit? When it comes to computers, the difference between 32-bit and a 64-bit is all about processing power. Computers with 32-bit processors are older, slower, and less secure, while a 64-bit processor is newer, faster, and more secure.
Xcode can build your app with both 32-bit and 64-bit binaries included so it works across all devices running iOS 7. If you wish to continue to support iOS 6 then you will need to build for 32-bit only. Next month we will be making changes that will allow you create a single app binary that supports 32-bit on iOS 6, as well as 32-bit and 64-bit on iOS 7.
Converting Your App to a 64-Bit Binary
At a high level, here are the steps to create an app that targets both the 32-bit and the 64-bit runtime environments:
1.Install Xcode 5.0.1.
2.Open your project. Xcode prompts you to modernize your project. Modernizing the project adds new warnings and errors that are important when compiling your app for 64-bit.
3.Update your project settings to support iOS 5.1.1 or later. You can’t build a 64-bit project if it targets an iOS version earlier than iOS 5.1.
4.Change the Architectures build setting in your project to “Standard Architectures (including 64-bit).”
5.Update your app to support the 64-bit runtime environment. The new compiler warnings and errors will help guide you through this process. However, the compiler doesn’t do all of the work for you; use the information in this document to help guide you through investigating your own code.
6.Test your app on actual 64-bit hardware. iOS Simulator can also be helpful during development, but some changes, such as the function calling conventions, are visible only when your app is running on a device.
7.Use Instruments to tune your app’s memory performance.
8.Submit an app that includes both architectures for approval.
The remainder of this chapter describes problems that frequently occur when porting a Cocoa Touch app to the 64-bit runtime environment. Use these sections to guide your own efforts to investigate your code.
From https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/ConvertingYourAppto64-Bit/ConvertingYourAppto64-Bit.html#//apple_ref/doc/uid/TP40013501-CH3-SW1
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