1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/abi/offsetof.C b/gcc/testsuite/g++.dg/abi/offsetof.C
new file mode 100644
index 000000000..d6a53e6f8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/abi/offsetof.C
@@ -0,0 +1,22 @@
+// Test that we can refer to the address of a base member of a null pointer
+// to get its offset.  The standard says that offsetof shall not be used on
+// non-POD classes, but there seems to be no such restriction on the common
+// implementation thereof.
+
+// Yes, this is bad, naughty, evil code.  But it seems to be well-formed.
+// So we'll just warn.
+
+// { dg-do run }
+
+struct A { int i; };
+
+struct B: public A {
+  virtual void f ();
+};
+
+struct C: public B { };
+
+int main ()
+{
+  return ((__SIZE_TYPE__) &((C*)0)->i) != sizeof(void*); // { dg-warning "offsetof|invalid" "" }
+}