Swift compiler segmentation fault when building

Question

Adding a (convenient) computed height property to UIView in my UIViewExtension.swift file is causing the Swift compiler to segfault...

Answer 1

When you run into a compiler segfault in Swift, you don't get a handy line number and error message. Here's how you can track the problem down:

1. Create a new file called SegFaultDebugger.swift in your project.
2. In this new file, define an extension to the class that's giving you problems.
3. Move a group of methods from the main file to SegFaultDebugger.swift.
4. Compile.

At this point, one of three things happens:

• You still get the segfault in the original file: Move the methods from SegFaultDebugger.swift back to the original file and move a different set of methods into SegFaultDebugger.swift. Repeat
• You get a segfault in SegFaultDebugger.swift: Great! Now use binary search to pin the segfault down to a specific method until you can figure out what construct is causing it.
• You get meaningful compiler errors: Great! Fix the errors. Once everything compiles, move your methods back into the original file.