Tentative fix

Author: alejandro-alvarez-sonarsource

clang/lib/Sema/SemaExpr.cpp

@@ -15861,10 +15861,19 @@ ExprResult Sema::ActOnStmtExprResult(ExprResult ER) {
   if (Cast && Cast->getCastKind() == CK_ARCConsumeObject)
     return Cast->getSubExpr();
 
+  auto Ty = E->getType().getUnqualifiedType();
+
+  // If the type is an atomic, the statement type is the underlying type.
+  if (const AtomicType *AT = Ty->getAs<AtomicType>()) {
+    Ty = AT->getValueType().getUnqualifiedType();
+    return ImplicitCastExpr::Create(Context, Ty, CK_AtomicToNonAtomic, E,
+                                    /*base path*/ nullptr, VK_PRValue,
+                                    FPOptionsOverride());
+  }
+
   // FIXME: Provide a better location for the initialization.
   return PerformCopyInitialization(
-      InitializedEntity::InitializeStmtExprResult(
-          E->getBeginLoc(), E->getType().getUnqualifiedType()),
+      InitializedEntity::InitializeStmtExprResult(E->getBeginLoc(), Ty),
       SourceLocation(), E);
 }