linjl296

xcode编译支持arm64位

官方:

https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/Introduction/Introduction.html

https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/OptimizingMemoryPerformance/OptimizingMemoryPerformance.html#//apple_ref/doc/uid/TP40013501-CH4-SW1

 

目前ios的指令集有以下几种:

  • armv6
    • iPhone
    • iPhone2
    • iPhone3G
    • 第一代和第二代iPod Touch
  • armv7
    • iPhone4
    • iPhone4S
  • armv7s
    • iPhone5
    • iPhone5C
  • arm64
    • iPhone5S

 机器对指令集的支持是向下兼容的,因此armv7的指令集是可以运行在iphone5S的,只是效率没那么高而已~

================================================

Architecture : 指你想支持的指令集。

Valid architectures : 指即将编译的指令集。

Build Active Architecture Only : 只是否只编译当前适用的指令集。

================================================

 现在是2014年初,其实4和4S的用户还是蛮多的,而iphone3之类的机器几乎没有了,所以我们的指令集最低必须基于armv7.

因此,Architecture的值选择:armv7 armv7s arm64

PS:选arm64时需要最低支持5.1.1:

Convert Your App to a 64-Bit Binary After Updating It for iOS 7

Xcode 5.0.1 can build your app with both 32-bit and 64-bit binaries included. This combined binary requires a minimum deployment target of iOS 5.1.1 or later. The 64-bit binary runs only on 64-bit devices running iOS 7.0.3 and later. If you have an existing app, you should first update your app for iOS 7 and then port it to run on 64-bit processors. By updating it first for iOS 7, you can remove deprecated code paths and use modern practices. If you’re creating a new app, target iOS 7 and compile 32-bit and 64-bit versions of your app.

The architecture for 64-bit apps on iOS is almost identical to the architecture for OS X apps, making it easy to create a common code base that runs in both operating systems. Converting a Cocoa Touch app to 64-bit follows a similar transition process as the one for Cocoa apps on OS X. Pointers and some common C types change from 32 bits to 64 bits. Code that relies on the NSInteger and CGFloat types needs to be carefully examined.

Start by building the app for the 64-bit runtime, fixing any warnings that occur as well as searching your code for specific 64-bit issues. For example:

  • Make sure all function calls have a proper prototype.

  • Avoid truncating 64-bit values by accidentally assigning them to a 32-bit data type.

  • Ensure that calculations are performed correctly in the 64-bit version of your app.

  • Create data structures whose layouts are identical in the 32-bit and 64-bit versions of your app (such as when you write a data file to iCloud).

1,如果想自己的app在各个机器都能够最高效率的运行,则需要将Build Active Architecture Only改为NO,Valid architectures选择对应的指令集:armv7 armv7s arm64。这个会为各个指令集编译对应的代码,因此最后的 ipa体积基本翻了3倍,Release版本必须NO。

2,如果想让app体积保持最小,则现阶段应该选择Valid architectures为armv7,这样Build Active Architecture Only选YES或NO就无所谓了