Xcode error:

verify final result code for completed build operation
Build operation failed without specifying any errors. Individual build tasks may have failed for unknown reasons.
One possible cause is if there are too many (possibly zombie) processes; in this case, rebooting may fix the problem.
Some individual build task failures (up to 12) may be listed below.
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1. Cocoapods version causes

Cocoapods github release page

Check that Cocoapods is the latest version 1.4.0 on your local MAC (24 Jan 2018)

Sudo gem install Cocoapods -v 1.3.1 // Check the pod version --versionCopy the code

Then re-pull the code, pod update compilation runs OK!

2.Perform single-object Prelink Settings cause

categories in static library

Instead of loading all the classes in the static library when xcode is compiled, it looks for symbols used in the main project and loads them in. But the big catch in this beautiful mechanic is that oc’s classification doesn’t generate signs, which means, For example, if you use NSString categoryMethod in a project, the compiler will only assume that NSString categoryMethod is needed, and not know that categoryMethod is a classification method in a static library, so it will not load the static library category.

The current solution is to give the compiler a flag that tells it to load the entire static library:

2).-force_load. O 3). -objc. Load all OC code. 4).Perform Single-Object Prelink. The first three build options are set in the main project, and this option is set in the static library. Means to precompile the subproject into a.o file, and package the entire.o file when the entire static library has a symbol referenced. The Perform Single-object Prelink implementation is buggy.

Refer to the article