[Bug c++/29365] Unnecessary anonymous namespace warnings

[Gabriel Dos Reis]

"Andrew Pinski" <pinskia@gmail.com> writes:

| On 29 Aug 2007 03:15:04 -0000, bangerth at dealii dot org
| <gcc-bugzilla@gcc.gnu.org> wrote:
| > It is a good question in itself whether pimpl_ has a type at all -- it's a
| > pointer to an incomplete type in any case :-)
| 
| All types in C++ are exported (well except for anonymous namespace
| types) including incomplete types.

What does not could mean in C++?

-- Gaby