Improve key-function computation for templates. In particular:
- All classes can have a key function; templates don't change that.
non-template classes when computing the key function.
- We always mark all of the virtual member functions of class
template instantiations.
- The vtable for an instantiation of a class template has weak
linkage.
We could probably use available_externally linkage for vtables of
classes instantiated by explicit instantiation declarations (extern
templates), but GCC doesn't do this and I'm not 100% that the ABI
permits it.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92753 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/vtable-key-function.cpp b/test/CodeGenCXX/vtable-key-function.cpp
index 90e8ea6..97a546f 100644
--- a/test/CodeGenCXX/vtable-key-function.cpp
+++ b/test/CodeGenCXX/vtable-key-function.cpp
@@ -13,3 +13,21 @@
A::A() { }
A::A(int) { }
}
+
+// Make sure that we don't assert when building the vtable for a class
+// template specialization or explicit instantiation with a key
+// function.
+template<typename T>
+struct Base {
+ virtual ~Base();
+};
+
+template<typename T>
+struct Derived : public Base<T> { };
+
+template<>
+struct Derived<char> : public Base<char> {
+ virtual void anchor();
+};
+
+void Derived<char>::anchor() { }