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There seem to be some problems with the new build system in Xcode 10+. How do I switch to the old (legacy) build system?
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To change the build system in Xcode either to the new one or legacy build system, in your Xcode navigate to File -> Workspace Settings . It will open the Workspace settings window as shown in the following screenshots. In the Workspace settings window, you will see a dropdown to change the Build System.
The new building system introduced in Xcode 10 is written by Swift from scratch, and brings lots of improved performance and reliability.
You can switch back to the previous (legacy) build system from the menu by File > Workspace Settings... (or Project Settings...):
This brings up a dialog where you can change the Build System to Legacy Build System:
Hat tip to this answer. There's also a video here.
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