title: I updated Xcode 10.2 to Xcode 11.2.1, resulting in the original Swift project unable to run
body: <p>The error of commandfailed due to signal: abort trap: 6 has not been solved. The specific error logs are as follows</p>
  
  <pre><code>2.  While running pass #0 SILModuleTransform "SerializeSILPass".
  3.  While serializing declaration 0x112201f10 (in module 'gali')
  4.  failed to serialize anything
  0  swift                    0x00000001087eba13 PrintStackTraceSignalHandler(void*) + 51
  1  swift                    0x00000001087eb1e6 SignalHandler(int) + 358
  2  libsystem_platform.dylib 0x00007fff6d155b1d _sigtramp + 29
  3  libsystem_platform.dylib 0x00007ffeeb860ad8 _sigtramp + 2121314264
  4  libsystem_c.dylib        0x00007fff6d02ba08 abort + 120
  5  swift                    0x00000001050ccdba swift::serialization::Serializer::writeDecl(swift::Decl const*) + 68458
  6  swift                    0x00000001050e342f swift::serialization::Serializer::writeAllDeclsAndTypes() + 62287
  7  swift                    0x00000001050f03f4 swift::serialization::Serializer::writeAST(llvm::PointerUnion&lt;swift::ModuleDecl*, swift::SourceFile*&gt;, bool) + 5364
  8  swift                    0x00000001050fd330 swift::serialization::Serializer::writeToStream(llvm::raw_ostream&amp;, llvm::PointerUnion&lt;swift::ModuleDecl*, swift::SourceFile*&gt;, swift::SILModule const*, swift::SerializationOptions const&amp;) + 6016
  9  swift                    0x00000001050fec0b bool llvm::function_ref&lt;bool (llvm::raw_pwrite_stream&amp;)&gt;::callback_fn&lt;swift::serialize(llvm::PointerUnion&lt;swift::ModuleDecl*, swift::SourceFile*&gt;, swift::SerializationOptions const&amp;, swift::SILModule const*)::$_8&gt;(long, llvm::raw_pwrite_stream&amp;) + 139
  10 swift                    0x0000000104405729 swift::withOutputFile(swift::DiagnosticEngine&amp;, llvm::StringRef, llvm::function_ref&lt;bool (llvm::raw_pwrite_stream&amp;)&gt;) + 2569
  11 swift                    0x00000001050fea67 swift::serialize(llvm::PointerUnion&lt;swift::ModuleDecl*, swift::SourceFile*&gt;, swift::SerializationOptions const&amp;, swift::SILModule const*) + 311
  12 swift                    0x00000001044411bb std::__1::__function::__func&lt;performCompileStepsPostSILGen(swift::CompilerInstance&amp;, swift::CompilerInvocation&amp;, std::__1::unique_ptr&lt;swift::SILModule, std::__1::default_delete&lt;swift::SILModule&gt; &gt;, bool, llvm::PointerUnion&lt;swift::ModuleDecl*, swift::SourceFile*&gt;, swift::PrimarySpecificPaths const&amp;, bool, int&amp;, swift::FrontendObserver*, swift::UnifiedStatsReporter*)::$_12, std::__1::allocator&lt;performCompileStepsPostSILGen(swift::CompilerInstance&amp;, swift::CompilerInvocation&amp;, std::__1::unique_ptr&lt;swift::SILModule, std::__1::default_delete&lt;swift::SILModule&gt; &gt;, bool, llvm::PointerUnion&lt;swift::ModuleDecl*, swift::SourceFile*&gt;, swift::PrimarySpecificPaths const&amp;, bool, int&amp;, swift::FrontendObserver*, swift::UnifiedStatsReporter*)::$_12&gt;, void ()&gt;::operator()() + 603
  13 swift                    0x0000000104be8c61 SerializeSILPass::run() + 49
  14 swift                    0x0000000104adf129 swift::SILPassManager::execute() + 7305
  15 swift                    0x000000010473bc0b swift::CompilerInstance::performSILProcessing(swift::SILModule*, swift::UnifiedStatsReporter*) + 1563
  16 swift                    0x0000000104437375 performCompile(swift::CompilerInstance&amp;, swift::CompilerInvocation&amp;, llvm::ArrayRef&lt;char const*&gt;, int&amp;, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 33925
  17 swift                    0x000000010442b6e4 swift::performFrontend(llvm::ArrayRef&lt;char const*&gt;, char const*, void*, swift::FrontendObserver*) + 6820
  18 swift                    0x00000001043b8be3 main + 1219
  19 libdyld.dylib            0x00007fff6cf54405 start + 1
  </code></pre>