[libcxx] Improve tests to use the UNSUPPORTED lit directive

Quite a few libcxx tests seem to follow the format:
 #if _LIBCPP_STD_VER > X
   // Do test.
 #else
   // Empty test.
 #endif
We should instead use the UNSUPPORTED lit directive to exclude the test on
earlier C++ standards. This gives us a more accurate number of test passes
for those standards and avoids unnecessary conflicts with other lit
directives on the same tests.

Reviewers: bcraig, ericwf, mclow.lists

Differential revision: http://reviews.llvm.org/D20730

llvm-svn: 271108

1 files changed, 1 insertions, 6 deletions

diff --git a/libcxx/test/std/experimental/optional/optional.object/optional.object.observe/dereference_const.pass.cpp b/libcxx/test/std/experimental/optional/optional.object/optional.object.observe/dereference_const.pass.cpp
index c72a57852a3..f1bdc36424d 100644
--- a/libcxx/test/std/experimental/optional/optional.object/optional.object.observe/dereference_const.pass.cpp
+++ b/libcxx/test/std/experimental/optional/optional.object/optional.object.observe/dereference_const.pass.cpp
@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03, c++11
 // <optional>
 
 // constexpr const T& optional<T>::operator*() const;
@@ -19,8 +20,6 @@
 #include <type_traits>
 #include <cassert>
 
-#if _LIBCPP_STD_VER > 11
-
 using std::experimental::optional;
 
 struct X
@@ -33,11 +32,8 @@ struct Y
     int test() const {return 2;}
 };
 
-#endif  // _LIBCPP_STD_VER > 11
-
 int main()
 {
-#if _LIBCPP_STD_VER > 11
     {
         constexpr optional<X> opt(X{});
         static_assert((*opt).test() == 3, "");
@@ -53,5 +49,4 @@ int main()
         assert(false);
     }
 #endif  // _LIBCPP_DEBUG
-#endif  // _LIBCPP_STD_VER > 11
 }