diff --git a/libcxx/src/CMakeLists.txt b/libcxx/src/CMakeLists.txt
--- a/libcxx/src/CMakeLists.txt
+++ b/libcxx/src/CMakeLists.txt
@@ -349,7 +349,12 @@
 
   if (LIBCXX_HERMETIC_STATIC_LIBRARY)
     append_flags_if_supported(CXX_STATIC_LIBRARY_FLAGS -fvisibility=hidden)
-    append_flags_if_supported(CXX_STATIC_LIBRARY_FLAGS -fvisibility-global-new-delete-hidden)
+    # If the hermetic library doesn't define the operator new/delete functions
+    # then its code shouldn't declare them with hidden visibility.  They might
+    # actually be provided by a shared library at link time.
+    if (LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS)
+      append_flags_if_supported(CXX_STATIC_LIBRARY_FLAGS -fvisibility-global-new-delete-hidden)
+    endif()
     target_compile_options(cxx_static PRIVATE ${CXX_STATIC_LIBRARY_FLAGS})
     target_compile_definitions(cxx_static PRIVATE _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
   endif()