[libc++][test] Miscellaneous MSVC cleanups

* Silence unused-local-typedef warnings: `map.cons/assign_initializer_list.pass.cpp` (and the `set.cons` variant) uses a local typedef only within `LIBCPP_ASSERT`s, so clang diagnoses it as unused when testing non-libc++.
* Add missing include: `c.math/abs.pass.cpp` uses `std::numeric_limits` but failed to `#include <limits>`.
* Don't test non-type: A "recent" change to `meta.trans.other/underlying_type.pass.cpp` unconditionally tests the type `F` which is conditionally defined.
* Use `hash<long long>` instead of `hash<short>` with `int` in `unordered_meow` deduction guide tests to avoid truncation warnings.
* Convert `3.14` explicitly in `midpoint.float.pass` since MSVC incorrectly diagnoses `float meow = 3.14;` as truncating.

Differential Revision: https://reviews.llvm.org/D68681

llvm-svn: 374248

1 files changed, 3 insertions, 1 deletions

diff --git a/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp b/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp
index fbbab50049d..3e08855d6ad 100644
--- a/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/underlying_type.pass.cpp
@@ -42,7 +42,7 @@ void check()
     ASSERT_SAME_TYPE(Expected, typename std::underlying_type<T>::type);
 #if TEST_STD_VER > 11
     ASSERT_SAME_TYPE(Expected, typename std::underlying_type_t<T>);
-#endif  
+#endif
 }
 
 enum E { V = INT_MIN };
@@ -79,7 +79,9 @@ int main(int, char**)
 //  SFINAE-able underlying_type
 #if TEST_STD_VER > 17
     static_assert( has_type_member<E>::value, "");
+#ifdef TEST_UNSIGNED_UNDERLYING_TYPE
     static_assert( has_type_member<F>::value, "");
+#endif // TEST_UNSIGNED_UNDERLYING_TYPE
     static_assert( has_type_member<G>::value, "");
 
     static_assert(!has_type_member<void>::value, "");