[libc++] Add clang-tidy check for version checks
This check flags code which uses `_LIBCPP_STD_VER` the wrong way, or tries to use `__cplusplus`. It flags cases where we use `_LIBCPP_STD_VER >` instead of `_LIBCPP_STD_VER >=` and where wrong values are used (e.g. `_LIBCPP_STD_VER >= 24`).
Reviewed By: ldionne, #libc
Spies: libcxx-commits
Differential Revision: https://reviews.llvm.org/D144261
diff --git a/libcxx/include/__chrono/concepts.h b/libcxx/include/__chrono/concepts.h
index d7502ef..38d6b0c 100644
--- a/libcxx/include/__chrono/concepts.h
+++ b/libcxx/include/__chrono/concepts.h
@@ -20,12 +20,12 @@
_LIBCPP_BEGIN_NAMESPACE_STD
-#if _LIBCPP_STD_VER > 17
+#if _LIBCPP_STD_VER >= 20
template <class _Tp>
concept __is_hh_mm_ss = __is_specialization_v<_Tp, chrono::hh_mm_ss>;
-#endif // _LIBCPP_STD_VER > 17
+#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
