[Clang] Modify sanity check assert in AggExprEmitter::VisitInitListExpr to cover anonymous struct in a union GNU extension

AggExprEmitter::VisitInitListExpr sanity checks that an empty union is really
empty and not a semantic analysis failure. The assert is missing that we allow
anonymous structs as a GNU extension. I have updated the assert to take that into account.

This fixes: https://github.com/llvm/llvm-project/issues/58800

Differential Revision: https://reviews.llvm.org/D139261

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index 8ba21f8fc004..303bcc89f671 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -1724,7 +1724,7 @@ void AggExprEmitter::VisitCXXParenListOrInitListExpr(
       // Make sure that it's really an empty and not a failure of
       // semantic analysis.
       for (const auto *Field : record->fields())
-        assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed");
+        assert((Field->isUnnamedBitfield() || Field->isAnonymousStructOrUnion()) && "Only unnamed bitfields or ananymous class allowed");
 #endif
       return;
     }