Vendor import of clang release_34 branch r197841 (effectively, 3.4 RC3):

https://llvm.org/svn/llvm-project/cfe/branches/release_34@197841

1 files changed, 26 insertions, 0 deletions

diff --git a/test/CodeGenCXX/dynamic_cast-no-rtti.cpp b/test/CodeGenCXX/dynamic_cast-no-rtti.cpp
new file mode 100644
index 0000000..0e26de5
--- /dev/null
+++ b/test/CodeGenCXX/dynamic_cast-no-rtti.cpp
@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -emit-llvm %s -verify -fno-rtti -o - | FileCheck %s
+// expected-no-diagnostics
+
+struct A {
+  virtual ~A(){};
+};
+
+struct B : public A {
+  B() : A() {}
+};
+
+// An upcast can be resolved statically and can be used with -fno-rtti, iff it
+// does not use runtime support.
+A *upcast(B *b) {
+  return dynamic_cast<A *>(b);
+// CHECK-LABEL: define %struct.A* @_Z6upcastP1B
+// CHECK-NOT: call i8* @__dynamic_cast
+}
+
+// A NoOp dynamic_cast can be used with -fno-rtti iff it does not use
+// runtime support.
+B *samecast(B *b) {
+  return dynamic_cast<B *>(b);
+// CHECK-LABEL: define %struct.B* @_Z8samecastP1B
+// CHECK-NOT: call i8* @__dynamic_cast
+}