[libcxx] random_device, for OpenBSD specify optimal entropy properties

Reviewed By: ldionne

Differential Revision: https://reviews.llvm.org/D94571

diff --git a/libcxx/src/random.cpp b/libcxx/src/random.cpp
index 7d0431e..29aa43b 100644 (file)
--- a/libcxx/src/random.cpp
+++ b/libcxx/src/random.cpp
@@ -189,6 +189,8 @@ random_device::entropy() const _NOEXCEPT
     return std::numeric_limits<result_type>::digits;
 
   return ent;
+#elif defined(__OpenBSD__)
+  return std::numeric_limits<result_type>::digits;
 #else
   return 0;
 #endif