Building with Xcode 12.5 fails with CompileSwift failed with a nonzero exit code and Segmentation fault: 11

Question

Created Apr ’21

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Project building started failing when I updated Xcode to 12.5. I'm getting two errors: CompileSwift failed with a nonzero exit code and Segmentation fault: 11

Each of these errors is printing out bunch of swift files which are normally used in project.
Output format is like this:

Code Block Compile abcd.swift (arm64)
Segmentation fault: 11

and

Code Block Compile abcd.swift (arm64)
Command CompileSwift failed with a nonzero exit code

I've tried with clean build, removing derived data, updating pods, and even restarting laptop and nothing works.

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Answer 1

OOPer OP

Apr ’21

Segmentation fault is an indication of a compiler bug and you should better send a bug report soon.

Can you create a simplified project to reproduce the issue, using the actual abcd.swift?

0

Answer 2

brpop OP

Apr ’21

Simplified project wouldn't be that easy to do since I have more than 30 swift files reported.

0

Answer 3

Claude31 OP

Apr ’21

If that may help…

I once had a segmentation fault 11.

Reason was:
In a struct defined as:

Code Block struct L {
    var u1: UInt64
    var u2: UInt64
    var u3: UInt64
    var u4: UInt64
}

I defined a subscript

Code Block extension L {
    subscript (j: Int, h: Int) -> Bool? {
}

As far as I remember, the fault occurred if I called

Code Block var lib  : [L]?
if lib[j,h] { }

instead of unwrapping:

Code Block if lib![j,h] { }

Hope that may help.

0

Answer 4

Keith43 OP

May ’21

I'm having this exact same problem. My macOS app builds and runs fine with Xcode 12.4 but produces Segmentation fault: 11 when I try 12.5.

0