Even Clang++ shipped with Xcode 4.1 still can't handle visibility of non-inline methods in exported template classes if the default visibility is 'hidden'. Disable visibility support for Clang for now, we'll revisit it in the future. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68471 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775