[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/value_const.pass.cpp b/libcxx/test/std/experimental/optional/optional.object/optional.object.observe/value_const.pass.cpp
index c99baab8b6e..a38b1f930c7 100644
--- a/libcxx/test/std/experimental/optional/optional.object/optional.object.observe/value_const.pass.cpp
+++ b/libcxx/test/std/experimental/optional/optional.object/optional.object.observe/value_const.pass.cpp
@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: c++98, c++03, c++11
 // XFAIL: libcpp-no-exceptions
 // <optional>
 
@@ -16,8 +17,6 @@
 #include <type_traits>
 #include <cassert>
 
-#if _LIBCPP_STD_VER > 11
-
 using std::experimental::optional;
 using std::experimental::in_place_t;
 using std::experimental::in_place;
@@ -31,11 +30,8 @@ struct X
     int test() {return 4;}
 };
 
-#endif  // _LIBCPP_STD_VER > 11
-
 int main()
 {
-#if _LIBCPP_STD_VER > 11
     {
         constexpr optional<X> opt(in_place);
         static_assert(opt.value().test() == 3, "");
@@ -55,5 +51,4 @@ int main()
         {
         }
     }
-#endif  // _LIBCPP_STD_VER > 11
 }