Error: “File was built for archive which is not th

Question

I have built my own Static C++ Library, which is built with the settings:

• Architectures: armv7, armv7s
• Build Active Architectures Only: No
• Support Platforms: iOS
• Valid Architectures: armv7, armv7s

The library project builds well and I got the .a file (I have cleaned the build folder and built the project again to be sure my settings were effective).

I have added the library (.a file) to my iOS project, but the project won't build even though I have set the exact same settings on the iOS project:

• Architectures: armv7s, armv7
• Build Active Architectures Only: Yes
• Support Platforms: iOS
• Valid Architectures: armv7, armv7s

I keep getting this error:

ld: warning: ignoring file /Users/hidden/Library/Developer/Xcode/DerivedData/HelloWorldCppLib-fomvvtklwijvqicyhahxleiscein/Build/Products/Debug-iphoneos/libHelloWorldCppLib.a, file was built for archive which is not the architecture being linked (armv7s): /Users/hidden/Library/Developer/Xcode/DerivedData/HelloWorldCppLib-fomvvtklwijvqicyhahxleiscein/Build/Products/Debug-iphoneos/libHelloWorldCppLib.a

What am I missing? It tells me the .a file was not built for armv7s, but that is exactly the settings I built the library with.

Answer 1

one additional notes is:

    Build Active Architectures Only  set to no

is for the lib project.

Answer 2

When you're building a library you must compile it both for the simulator and the device and then merge the two outputs (.a files) into 1 library and then link it to your iOS project.

Answer 3

I have got the exact same error when with cocapods : For me the solution was to have two differents Build Active Architecture for target and pods.

App Target :

Build Active Architectures Only  **Yes**

pods Target

Build Active Architectures Only  **No**

Answer 4

I use XCode 5.1.1 and ran into the described problem. A more convenient way to solve this problem seems to be just to create an Archive (via menu Build/Archive) and distribute it. The distributed lib file will contain all defined architectures.

Answer 5

I ran into a similar problem myself. @graver's solution is definitely valid.

The issue was that the library was being built for armv7 instead of armv7s. You can verify this yourself by using lipo <path/to/lib.a> -info.

Setting the Build Active Architectures Only option to No fixes the issue.

Hope this helps.

Answer 6

unfortunately all these pieces of advice don't work for me - Xcode 7.3.1 (7D1014), iPhone 5. but as soon as I removed all Xcode temporary files (+ restart Xcode) and rebuild again it became working.