Right-click (or control-click) the error message and choose “Reveal in Log”.
For this demo, I forced a linker error by manually truncating one of my .o files. Your error will probably be something else.
The first thing to try if you can't tell make sense of the linker error (once you find it in the log) is to do a clean build. Hold the option key ( ⌥ ) and choose Product > Clean Build Folder…. Then choose Product > Build.
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