[...] WriteAuxiliaryFile /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared-OutputFileMap.json (in target 'Shared' from project 'Client') cd /Users/pierre/workspace/apple/dev write-file /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared-OutputFileMap.json WriteAuxiliaryFile /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared.LinkFileList (in target 'Shared' from project 'Client') cd /Users/pierre/workspace/apple/dev write-file /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared.LinkFileList Ditto /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/module.modulemap /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Products/Firefox-iphoneos/Shared.framework/Modules/module.modulemap (in target 'Shared' from project 'Client') cd /Users/pierre/workspace/apple/dev builtin-copy -exclude .DS_Store -exclude CVS -exclude .svn -exclude .git -exclude .hg -strip-debug-symbols -strip-tool /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip -resolve-src-symlinks /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/module.modulemap /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Products/Firefox-iphoneos/Shared.framework/Modules CompileSwiftSources normal arm64 com.apple.xcode.tools.swift.compiler (in target 'Shared' from project 'Client') cd /Users/pierre/workspace/apple/dev export DEVELOPER_DIR\=/Applications/Xcode.app/Contents/Developer export SDKROOT\=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc -incremental -module-name Shared -O -whole-module-optimization -enforce-exclusivity\=checked @/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared.SwiftFileList -DMOZ_TARGET_CLIENT -DMOZ_CHANNEL_RELEASE -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk -target arm64-apple-ios12.0 -g -module-cache-path /Users/pierre/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -Xfrontend -serialize-debugging-options -enable-testing -swift-version 5 -I /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Products/Firefox-iphoneos -F /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Products/Firefox-iphoneos -F /Users/pierre/workspace/apple/dev/Carthage/Build/iOS -c -num-threads 8 -output-file-map /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared-OutputFileMap.json -parseable-output -serialize-diagnostics -emit-dependencies -emit-module -emit-module-path /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared.swiftmodule -Xcc -I/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Shared-generated-files.hmap -Xcc -I/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Shared-own-target-headers.hmap -Xcc -I/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Shared-all-non-framework-target-headers.hmap -Xcc -ivfsoverlay -Xcc /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/all-product-headers.yaml -Xcc -iquote -Xcc /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Shared-project-headers.hmap -Xcc -I/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Products/Firefox-iphoneos/include -Xcc -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include -Xcc -I/Users/pierre/workspace/apple/dev -Xcc -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk/usr/include/libxml2 -Xcc -I/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/DerivedSources-normal/arm64 -Xcc -I/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/DerivedSources/arm64 -Xcc -I/Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/DerivedSources -emit-objc-header -emit-objc-header-path /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/Client.build/Firefox-iphoneos/Shared.build/Objects-normal/arm64/Shared-Swift.h -import-objc-header /Users/pierre/workspace/apple/dev/Shared/Shared-Bridging-Header.h -pch-output-dir /Users/pierre/Library/Developer/Xcode/DerivedData/Client-csqnojtxxzlbojdkprrgktkafhpb/Build/Intermediates.noindex/PrecompiledHeaders -working-directory /Users/pierre/workspace/apple/dev <unknown>:0: error: unable to execute command: Illegal instruction: 4 <unknown>:0: error: compile command failed due to signal 4 (use -v to see invocation)