在iOS设备和iOS模拟器上运行时，我的.a应该是什么体系结构

Question

I have build a fat library with the architectures "arm64", "armv7" and "x86" from various lib.a. I have no problem when I compile the project for iOS Devices but it seems the compilation goes wrong when I try it into a iOS simulator. It says "Undefined Symbols for x86_64". I can Imagine that I need also the x86_64 lib.a But I wonder what can I do for solving the problem.

Note: The libraries where manually compiled from OpenHome

Than you

Edited: Could be because of the makefile from Here

Answer 1

As a first step, make sure if your fat bin definitely includes x86_64. To do so, you can check w/ cmd as follows.

$ xcrun lipo -info yourLibrary.a

If your lib definitely contains x86_64, it should show

Architectures in the fat file: yourLibrary.a are: x86_64 arm64 ...

For example, I have compiled libpng for x86_64 and arm64 for my app. The xcrun command shows as follow.

$ xcrun lipo -info libpng.a
  Architectures in the fat file: libpng.a are: x86_64 arm64 

Needless to say, fat bin has both arm64 and x86 (since it's FAT). So fat bin doesn't require separate x86_64 lib.a as you mentioned in you q.

Checking your Makefile is after you confirmed your fat bin has x86_64.