1 files changed, 5 insertions, 1 deletions
diff --git a/contrib/llvm-project/clang/lib/Serialization/ASTWriter.cpp b/contrib/llvm-project/clang/lib/Serialization/ASTWriter.cpp
index fac8fc141d2c..0739dcc1ce60 100644
--- a/contrib/llvm-project/clang/lib/Serialization/ASTWriter.cpp
+++ b/contrib/llvm-project/clang/lib/Serialization/ASTWriter.cpp
@@ -4347,8 +4347,12 @@ void ASTWriter::WriteModuleFileExtension(Sema &SemaRef,
 
 void ASTRecordWriter::AddAttr(const Attr *A) {
   auto &Record = *this;
-  if (!A)
+  // FIXME: Clang can't handle the serialization/deserialization of
+  // preferred_name properly now. See
+  // https://github.com/llvm/llvm-project/issues/56490 for example.
+  if (!A || (isa<PreferredNameAttr>(A) && Writer->isWritingNamedModules()))
     return Record.push_back(0);
+
   Record.push_back(A->getKind() + 1); // FIXME: stable encoding, target attrs
 
   Record.AddIdentifierRef(A->getAttrName());