diff --git a/libcxx/include/memory b/libcxx/include/memory
--- a/libcxx/include/memory
+++ b/libcxx/include/memory
@@ -3271,13 +3271,7 @@
     long use_count() const _NOEXCEPT {return __shared_count::use_count();}
     __shared_weak_count* lock() _NOEXCEPT;
 
-    // Define the function out only if we build static libc++ without RTTI.
-    // Otherwise we may break clients who need to compile their projects with
-    // -fno-rtti and yet link against a libc++.dylib compiled
-    // without -fno-rtti.
-#if !defined(_LIBCPP_NO_RTTI) || !defined(_LIBCPP_BUILD_STATIC)
     virtual const void* __get_deleter(const type_info&) const _NOEXCEPT;
-#endif
 private:
     virtual void __on_zero_shared_weak() _NOEXCEPT = 0;
 };
diff --git a/libcxx/src/memory.cpp b/libcxx/src/memory.cpp
--- a/libcxx/src/memory.cpp
+++ b/libcxx/src/memory.cpp
@@ -124,16 +124,12 @@
     return nullptr;
 }
 
-#if !defined(_LIBCPP_NO_RTTI) || !defined(_LIBCPP_BUILD_STATIC)
-
 const void*
 __shared_weak_count::__get_deleter(const type_info&) const _NOEXCEPT
 {
     return nullptr;
 }
 
-#endif  // _LIBCPP_NO_RTTI
-
 #if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
 
 _LIBCPP_SAFE_STATIC static const std::size_t __sp_mut_count = 16;
diff --git a/libcxxabi/CMakeLists.txt b/libcxxabi/CMakeLists.txt
--- a/libcxxabi/CMakeLists.txt
+++ b/libcxxabi/CMakeLists.txt
@@ -338,10 +338,6 @@
     list(APPEND LIBCXXABI_COMPILE_FLAGS -DNDEBUG)
   endif()
 endif()
-# Static library
-if (NOT LIBCXXABI_ENABLE_SHARED)
-  list(APPEND LIBCXXABI_COMPILE_FLAGS -D_LIBCPP_BUILD_STATIC)
-endif()
 
 # Threading
 if (NOT LIBCXXABI_ENABLE_THREADS)