Prevent devirtualization of calls to un-instantiated functions.

PR 27895

Differential Revision: https://reviews.llvm.org/D22057

llvm-svn: 305862

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/Sema/Sema.cpp b/clang/lib/Sema/Sema.cpp
index e7b0914641f..007a5e483e6 100644
--- a/clang/lib/Sema/Sema.cpp
+++ b/clang/lib/Sema/Sema.cpp
@@ -740,6 +740,9 @@ void Sema::ActOnEndOfTranslationUnit() {
       // Load pending instantiations from the external source.
       SmallVector<PendingImplicitInstantiation, 4> Pending;
       ExternalSource->ReadPendingInstantiations(Pending);
+      for (auto PII : Pending)
+        if (auto Func = dyn_cast<FunctionDecl>(PII.first))
+          Func->setInstantiationIsPending(true);
       PendingInstantiations.insert(PendingInstantiations.begin(),
                                    Pending.begin(), Pending.end());
     }