xcode armv6 armv7 armv7s arm64指令集，xcodearm64

xcode armv6 armv7 armv7s arm64指令集，xcodearm64

郝萌主傾心貢獻，尊重作者的勞動成果，請勿轉載。

如果文章對您有所協助，歡迎給作者捐贈，支援郝萌主，捐贈數額隨意，重在心意^_^ 

我要捐贈: 點擊捐贈

Cocos2d-X源碼下載：點我傳送

之前每個版本的ipa包打出來都才20M出頭，後來不知道從哪個版本起打的包每次都將近40M，但是工程中也沒有明顯的增加很大第三方類或者圖片、靜態檔案。於是就開始了各種瘦身計劃：壓縮圖片，刪除不必要靜態庫。做了一番改動後發現包只比原來小了1M多，收效甚微。

其實是armv6 armv7 armv7s arm64引起編譯包翻倍增大的問題，試了一下，果然ipa包又回到了以前的大小。

下邊來說一下關於ios這個指令集：

目前ios的指令集有以下幾種：

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

 機器對指令集的支援是向下相容的，因此armv7的指令集是可以運行在iphone5S的，只是效率沒那麼高而已~

在xcodeTARGETS裡邊Architectures:

Architecture ： 指你想支援的指令集。

Valid architectures : 指即將編譯的指令集。

Build Active Architecture Only : 只是否只編譯當前適用的指令集。

 現在4S的使用者還是蠻多的，而iphone3之類的機器幾乎沒有了，所以我們的指令集最低必須基於armv7。

因此,Architecture的值選擇：armv7 armv7s arm64

PS:選arm64時需要最低支援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在各個機器都能夠最高效率的運行，則需要將Build Active Architecture Only改為NO,Valid architectures選擇對應的指令集：armv7 armv7s arm64。這個會為各個指令集編譯對應的代碼，因此最後的 ipa體積基本翻了3倍,Release版本必須NO。

2，如果想讓app體積保持最小，則現階段應該選擇Valid architectures為armv7,這樣Build Active Architecture Only選YES或NO就無所謂了

現在，官方提交APP必須支援64位了。

郝萌主傾心貢獻，尊重作者的勞動成果，請勿轉載。

如果文章對您有所協助，歡迎給作者捐贈，支援郝萌主，捐贈數額隨意，重在心意^_^ 

我要捐贈: 點擊捐贈

Cocos2d-X源碼下載：點我傳送