Error: "File was built for archive which is not the architecture being linked (armv7s)"

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

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.