It’s unlikely the problem is due to unified builds, since those are just source 
files with includes in them.

But I have encountered problems like this before; sometimes they are things 
affecting lots of people and I’ve been able to fix them. When trying to 
understand causes of this kind of problem in the past, an Xcode build system 
feature that Dan Bernstein told me about was really useful. To use it you can 
type this command:

% defaults write com.apple.dt.Xcode ExplainWhyBuildCommandsAreRun -bool YES

Then rebuild and the log will contain additional information about each build 
step.

Good luck and please let us know what you find!

— Darin

PS: That should work for now since WebKit still uses the “legacy Xcode build 
system” but I hear it won’t work once we move to the modern build system.
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