ios 7 Undefined symbols for architecture armv7 on ios 7

Question

I am working on xcode 6 and I create a static library, the application working fine on ios 8 but I got this problem Undefined symbols for architecture armv7 when I try to lunch the app on ios 7.

Can someone tell me why please?

Answer 1

Select project target > Build Settings > Search for "VALID_ARCHS"

Check whether you've added armv7, if not, add it.

---

Further reading about "VALID_ARCHS", you can refer to THIS ANSWER.