This patch makes "&Cls::purevfn" not an odr use. This isn't what the standard

says, but that's a defect (to be filed). "Cls::purevfn()" is still an odr use.

Also fixes a bug that caused us to not mark the function referenced just
because we didn't want to mark it odr used.

llvm-svn: 174242

1 files changed, 19 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/undefined-internal.cpp b/clang/test/SemaCXX/undefined-internal.cpp
index 62c6ff96ca9..227e6b4a85e 100644
--- a/clang/test/SemaCXX/undefined-internal.cpp
+++ b/clang/test/SemaCXX/undefined-internal.cpp
@@ -212,3 +212,22 @@ namespace test9 {
     x.X::used(); // expected-note {{used here}}
   }
 }
+
+namespace test10 {
+  namespace {
+    struct X {
+      virtual void notused() = 0;
+      virtual void used() = 0; // expected-warning {{function 'test10::<anonymous namespace>::X::used' has internal linkage but is not defined}}
+
+      void test() {
+        notused();
+        (void)&X::notused;
+        (this->*&X::notused)();
+        X::used();  // expected-note {{used here}}
+      }
+    };
+    struct Y : X {
+      using X::notused;
+    };
+  }
+}