CocoaPods libraries errors building for some iOS simulators

Question

Short error:

file was built for archive which is not the architecture being linked (i386)

Expanded:
For some simulators, I receive these errors when building my project:

ld: warning: ignoring file /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libFSCalendar.a, file was built for archive which is not the architecture being linked (i386): /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libFSCalendar.a ld: warning: ignoring file /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libGBDeviceInfo.a, file was built for archive which is not the architecture being linked (i386): /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libGBDeviceInfo.a ld: warning: ignoring file /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libSCLAlertView-Objective-C.a, file was built for archive which is not the architecture being linked (i386): /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libSCLAlertView-Objective-C.a ld: warning: ignoring file /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libSSKeychain.a, file was built for archive which is not the architecture being linked (i386): /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build/Products/Debug-iphonesimulator/libSSKeychain.a Undefined symbols for architecture i386: "_OBJC_CLASS_$_FSCalendar", referenced from: objc-class-ref in VCalendarView.o "_OBJC_CLASS_$_GBDeviceInfo", referenced from: objc-class-ref in VEMailView.o objc-class-ref in DataClass.o "_OBJC_CLASS_$_SCLAlertView", referenced from: objc-class-ref in VAlerts.o "_OBJC_CLASS_$_SCLAlertViewBuilder", referenced from: objc-class-ref in VAlerts.o "_OBJC_CLASS_$_SCLAlertViewShowBuilder", referenced from: objc-class-ref in VAlerts.o "_OBJC_CLASS_$_SSKeychain", referenced from: objc-class-ref in VDescriptionView.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)

It works for, say, iPhone 6 Plus simulator 9.3.0 but not for iPhone 5s. Why? I have got $(inherited) for the Other Linker Flags option.

Answer 1

I solved it by deleting the DerivedData directory.

Steps:

1. In Xcode, go to Menu bar → Window → Projects.

2. In the Projects window, choose the project on the left.

3. Click the Delete... button for Derived Data. When asked to confirm, click Delete.

4. Rebuild the project.

---

For Xcode 8, see this Q & A:
How to delete derived data in Xcode 8?

Answer 2

I found the solution.

I removed the directory /Users/admin/Library/Developer/Xcode/DerivedData/myApp-ekwldvjyuxwkykbareyvvydbtero/Build (right click on the library of CocoaPods > Show in Finder, then find its parent directory) and rebuild all again. Xcode recreated all libraries which works right now. All build preferences are the same as default.