Realm for Swift 3.1 - Command failed due to signal: Illegal instruction: 4

Question

After updating Swift to v3.1, I got Realm frameworks replaced by the new version downloaded from Realm Swift 2.5.1 but get the following issue:

Command failed due to signal: Illegal instruction: 4

Already checked this and this, but they didn't work.

Here is the error description, not sure if it's helpful though.

CompileSwift normal x86_64 /Users/linhcn/Documents/XcodeProjects/HerdManager/HerdManager/Models/ActionCategory.swift -target x86_64-apple-ios9.3 -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.3.sdk -I /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Products/Debug-iphonesimulator -F /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Products/Debug-iphonesimulator -F /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Products/Debug-iphonesimulator/FileBrowser -F /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Products/Debug-iphonesimulator/Realm -F /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Products/Debug-iphonesimulator/RealmSwift -F /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Products/Debug-iphonesimulator/Toast-Swift -F /Users/linhcn/Documents/XcodeProjects/HerdManager/HerdManager/Frameworks -enable-testing -g -module-cache-path /Users/linhcn/Library/Developer/Xcode/DerivedData/ModuleCache -D DEBUG -D COCOAPODS -serialize-debugging-options -Xcc -I/Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/HerdManager-generated-files.hmap -Xcc -I/Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/HerdManager-own-target-headers.hmap -Xcc -I/Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/HerdManager-all-non-framework-target-headers.hmap -Xcc -ivfsoverlay -Xcc /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/all-product-headers.yaml -Xcc -iquote -Xcc /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/HerdManager-project-headers.hmap -Xcc -I/Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Products/Debug-iphonesimulator/include -Xcc -I/Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/DerivedSources/x86_64 -Xcc -I/Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -DCOCOAPODS=1 -Xcc -working-directory/Users/linhcn/Documents/XcodeProjects/HerdManager -emit-module-doc-path /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/Objects-normal/x86_64/Invoice~partial.swiftdoc -serialize-diagnostics-path /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/Objects-normal/x86_64/Invoice.dia -Onone -module-name HerdManager -emit-module-path /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/Objects-normal/x86_64/Invoice~partial.swiftmodule -emit-dependencies-path /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/Objects-normal/x86_64/Invoice.d -emit-reference-dependencies-path /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/Objects-normal/x86_64/Invoice.swiftdeps -o /Users/linhcn/Library/Developer/Xcode/DerivedData/HerdManager-exytfaymknfhzqabpximiccdzmaa/Build/Intermediates/HerdManager.build/Debug-iphonesimulator/HerdManager.build/Objects-normal/x86_64/Invoice.o

Answer 1

Problem solved.

I guess that it's a problem of the new Xcode's (8.3.2) error report system. Apple may add some new coding rules but not update the error reporter. I ended up commenting out all the code and uncommenting each part to figure out where the problem is. It reports errors in some classes but the actual problem is in another class.