为在 armv7s 上运行的 iOS 设备编译 Boost c++ 库答案

【问题标题】：Complie Boost c++ library for iOS devices running on armv7s为在 armv7s 上运行的 iOS 设备编译 Boost c++ 库
【发布时间】：2013-05-24 16:46:52
【问题描述】：

我已经成功地在 armv6 和 armv7 上为 iPhone/iPad 构建了 boost c++ 1_44_0 库，但我似乎无法为在 armv7s 上运行的较新设备创建构建。

在 Github 上使用 BoostOnIphone 和 A-coding 来创建构建，我只需要 Boost：armv7s 架构上的线程、文件系统和系统库。

错误输出：

ld: warning: ignoring file /Users/shams/Documents/Sources/Hawk.framework/Release-iphonesimulator/libhawk-engine.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Documents/Sources/Hawk.framework/Release-iphonesimulator/libhawk-engine.ald: warning: 
ld: warning: ignoring file /Users/shams/Documents/Sources/Hawk.framework/Release-iphoneos/libhawk-engine.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Documents/Sources/Hawk.framework/Release-iphoneos/libhawk-engine.ald: warning: ignoring file /Users/shams/Documents/Sources/boost.framework/Release-iphonesimulator/libboost_filesystem.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Documents/Sources/boost.framework/Release-iphonesimulator/libboost_filesystem.a
ignoring file /Users/shams/Documents/Sources/boost.framework/Release-iphonesimulator/libboost_system.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Documents/Sources/boost.framework/Release-iphonesimulator/libboost_system.a

ld: warning: 
ld: warning: ignoring file /Users/shams/Documents/Sources/boost.framework/Release-iphonesimulator/libboost_thread.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Documents/Sources/boost.framework/Release-iphonesimulator/libboost_thread.ald: warning: ignoring file /Users/shams/Downloads/boostoniphone-master/build/armv7/libboost_filesystem.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Downloads/boostoniphone-master/build/armv7/libboost_filesystem.a

ignoring file /Users/shams/Downloads/boostoniphone-master/build/armv7/libboost_system.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Downloads/boostoniphone-master/build/armv7/libboost_system.a
ld: warning: 

ignoring file /Users/shams/Downloads/boostoniphone-master/build/armv7/libboost_thread.a, file was built for archive which is not the architecture being linked (armv7s): /Users/shams/Downloads/boostoniphone-master/build/armv7/libboost_thread.a
Undefined symbols for architecture armv7s:

【问题讨论】：

您为 armv7 构建时使用了哪些编译器标志？尝试不设置任何 -arch - IIRC，它对我有用。
错误提示找不到架构

标签： iphone ios xcode ipad boost

【解决方案1】：

我的解决方案是使用终端验证库架构：

otool -h libraryFile.a

输出：

Mach header
      magic cputype cpusubtype  caps    filetype ncmds sizeofcmds      flags
 0xfeedface      12          9  0x00          1     3       1588 0x00002000

cputype 和 cpusubtype 是要查找的值：

对于 armv7：

cpu 类型：12 cpusubtype：9

对于 armv7s：

cpu 类型：12 cpusubtype：11

现在我处于一种情况，我不可能以第三方的身份更新架构。所以我最终改变了我的 Xcode 构建项目：

Xcode 设置（蓝色标签）
项目和目标架构：
仅添加了 armv7 的有效架构
清理构建并再次运行

还有一个替代解决方案是使用本教程Hacking an armv7s library。在我的情况下不起作用

【讨论】：