Adding a -Wunused-value warning for expressions with side effects used in an unevaluated expression context, such as sizeof(), or decltype(). Also adds a similar warning when the expression passed to typeid() *is* evaluated, since it is equally likely that the user would expect the expression operand to be unevaluated in that case.

llvm-svn: 224465

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/test/SemaCXX/vararg-non-pod.cpp b/clang/test/SemaCXX/vararg-non-pod.cpp
index 66da9964b42..39d4cccacd3 100644
--- a/clang/test/SemaCXX/vararg-non-pod.cpp
+++ b/clang/test/SemaCXX/vararg-non-pod.cpp
@@ -103,7 +103,7 @@ Base &get_base(...);
 int eat_base(...);
 
 void test_typeid(Base &base) {
-  (void)typeid(get_base(base)); // expected-warning{{cannot pass object of non-POD type 'Base' through variadic function; call will abort at runtime}}
+  (void)typeid(get_base(base)); // expected-warning{{cannot pass object of non-POD type 'Base' through variadic function; call will abort at runtime}} expected-warning{{expression with side effects will be evaluated despite being used as an operand to 'typeid'}}
   (void)typeid(eat_base(base)); // okay
 }