Linker command failed with exit code 1 error in Xcode project

Question

I was working on my project and suddenly after editing the code and compiling gave this error:

ld: warning: directory not found for option \'-
L/Use

Answer 1

After running into this problem a few minutes ago (yes, I know it's been 7 months since the original thread) I found that the root of my issue was due to me dragging & dropping files into my project within XCode instead of right-clicking and choosing Add Files to Project.