G M: Provides the _LIBCPP_WARNING macro, to be used for MSVC only, since that compiler doesn't support #warning.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@191980 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/ext/hash_set b/include/ext/hash_set
index deffcb6..c4bb898 100644
--- a/include/ext/hash_set
+++ b/include/ext/hash_set
@@ -199,7 +199,11 @@
#include <ext/__hash>
#if __DEPRECATED
-#warning Use of the header <ext/hash_set> is deprecated. Migrate to <unordered_set>
+#if defined(_MSC_VER) && ! defined(__clang__)
+ _LIBCPP_WARNING("Use of the header <ext/hash_set> is deprecated. Migrate to <unordered_set>")
+#else
+# warning Use of the header <ext/hash_set> is deprecated. Migrate to <unordered_set>
+#endif
#endif
namespace __gnu_cxx {
