That remark isn't an actual error, just a warning. The real error can be found in the nested Compile Swift source files under the top-level section with the same name. Expand the logs for this command and you should see the actual error. Inspired by ryanavocado. For me, it was caused by SKPhotoBrowser in my Podfile. After removing it, the error goes away. LLVM ERROR: out of memory Allocation failed Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace. Stack dump: 0. Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file /Users/***/Library/Developer/Xcode/DerivedData/***/Build/Intermediates.noindex/ArchiveIntermediates/***/IntermediateBuildFilesPath/Pods.build/Release-iphoneos/SKPhotoBrowser.build/Objects-normal/arm64/SKPhotoBrowser.bc -embed-bitcode -target arm64-apple-ios13.0 -Xllvm -aarch64-use-tbi -O -disable-llvm-optzns -module-name SKPhotoBrowser -o /Users/***/Library/Developer/Xcode/DerivedData/***/Build/Intermediates.noindex/ArchiveIntermediates/***/IntermediateBuildFilesPath/Pods.build/Release-iphoneos/SKPhotoBrowser.build/Objects-normal/arm64/SKPhotoBrowser.o 1. Apple Swift version 5.6 (swiftlang-5.6.0.323.62 clang-1316.0.20.8) 2. Compiling with the current language version 3. Running pass 'Function Pass Manager' on module '/Users/***/Library/Developer/Xcode/DerivedData/***-hhhfwlkzxdivscfrppsfvbhllnzc/Build/Intermediates.noindex/ArchiveIntermediates/***/IntermediateBuildFilesPath/Pods.build/Release-iphoneos/SKPhotoBrowser.build/Objects-normal/arm64/SKPhotoBrowser.bc'. 4. Running pass 'ObjC ARC contraction' on function '@UI_USER_INTERFACE_IDIOM' Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it): 0 swift-frontend 0x00000001077f8de7 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 39 1 swift-frontend 0x00000001077f7e38 llvm::sys::RunSignalHandlers() + 248 2 swift-frontend 0x00000001077f9440 SignalHandler(int) + 288 3 libsystem_platform.dylib 0x00007ff810cf2dfd _sigtramp + 29 4 libsystem_platform.dylib 0x000000031069bae0 _sigtramp + 18446603383459187968 5 libsystem_c.dylib 0x00007ff810c28d24 abort + 123 6 swift-frontend 0x0000000107745cda llvm::report_bad_alloc_error(char const*, bool) + 106 7 swift-frontend 0x0000000107745cf2 out_of_memory_new_handler() + 18 8 libc++abi.dylib 0x00007ff810c9a96b operator new(unsigned long) + 43 9 swift-frontend 0x0000000107506efd llvm::Function::BuildLazyArguments() const + 77 10 swift-frontend 0x00000001052efe87 llvm::objcarc::BundledRetainClaimRVs::insertRVCallWithColors(llvm::Instruction*, llvm::CallBase*, llvm::DenseMap<llvm::BasicBlock*, llvm::TinyPtrVector<llvm::BasicBlock*>, llvm::DenseMapInfo<llvm::BasicBlock*>, llvm::detail::DenseMapPair<llvm::BasicBlock*, llvm::TinyPtrVector<llvm::BasicBlock*> > > const&) + 151 11 swift-frontend 0x0000000105302f88 (anonymous namespace)::ObjCARCContract::run(llvm::Function&, llvm::AAResults*, llvm::DominatorTree*) + 1384 12 swift-frontend 0x000000010753e380 llvm::FPPassManager::runOnFunction(llvm::Function&) + 1488 13 swift-frontend 0x0000000107545073 llvm::FPPassManager::runOnModule(llvm::Module&) + 67 14 swift-frontend 0x000000010753eb39 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 1161 15 swift-frontend 0x0000000102a5c6df swift::performLLVMOptimizations(swift::IRGenOptions const&, llvm::Module*, llvm::TargetMachine*) + 3791 16 swift-frontend 0x0000000102a5d8cc swift::performLLVM(swift::IRGenOptions const&, swift::DiagnosticEngine&, llvm::sys::SmartMutex<false>*, llvm::GlobalVariable*, llvm::Module*, llvm::TargetMachine*, llvm::StringRef, swift::UnifiedStatsReporter*) + 2812 17 swift-frontend 0x0000000102a66aa5 swift::performLLVM(swift::IRGenOptions const&, swift::ASTContext&, llvm::Module*, llvm::StringRef) + 213 18 swift-frontend 0x0000000102521795 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 16565 19 swift-frontend 0x00000001024e05d4 swift::mainEntry(int, char const**) + 1108 20 dyld 0x000000020a16151e start + 462 21 dyld 0x000000020a15c000 start + 18446744073709530288 error: Abort trap: 6 (in target 'SKPhotoBrowser' from project 'Pods')