https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83624
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to andysem from comment #0) > The problem with this warning is that it suggests using inline namespaces > instead, but that is not an option on C++03 code base. The attribute is used > precisely to emulate C++11 inline namespaces in C++03 mode. But GCC supports inline namespaces even in C++03 mode (without -Wpedantic-errors). If you can use a non-standard GNU-specific attribute in your C++03 code, then you should be able to use non-standard inline namespaces in C++03 instead. i.e. the attribute is deprecated and support for it may eventually be removed, because you can just use inline namespaces instead. Support for them won't be removed.
