gnulib's obstack_* symbols in dynamic exports on glibc. Intentional?

[Bruno Haible]

Sergei Trofimovich wrote:
> to my surprise it did have one a set of dynamically exported symbols:
> 
>     $ nm -D `which ls` | grep -v '^ '
>     00000000004c0d40 T _obstack_allocated_p
>     0000000000534808 D obstack_alloc_failed_handler
>     00000000004c0bd0 T _obstack_begin
>     00000000004c0bf0 T _obstack_begin_1
>     00000000004c0d80 T _obstack_free
>     00000000004c0e00 T _obstack_memory_used
>     00000000004c0c10 T _obstack_newchunk

There's already a discussion on this topic, that started at
  https://lists.gnu.org/archive/html/bug-gnulib/2022-12/msg00007.html

Bruno