PR libstdc++/64276 * doc/doxygen/user.cfg.in: Define __cpp_exceptions and __cpp_rtti. * doc/html/manual/using_exceptions.html: Regenerate. * doc/xml/manual/using_exceptions.xml: Use SD-6 feature-testing macros, __cpp_exceptions and __cpp_rtti, instead of __EXCEPTIONS and __GXX_RTTI. * include/bits/c++config: Likewise. * include/bits/locale_classes.tcc: Likewise. * include/bits/shared_ptr.h: Likewise. * include/bits/shared_ptr_base.h: Likewise. * include/debug/formatter.h: Likewise. * include/experimental/any: Likewise. * include/ext/rope: Likewise. * include/ext/ropeimpl.h: Likewise. * include/std/functional: Likewise. * include/tr1/functional: Likewise. * include/tr1/shared_ptr.h: Likewise. * libsupc++/eh_call.cc: Likewise. * libsupc++/eh_personality.cc: Likewise. * libsupc++/exception_defines.h: Likewise. * libsupc++/exception_ptr.h: Likewise. * libsupc++/guard.cc: Likewise. * libsupc++/pbase_type_info.cc: Likewise. * libsupc++/pointer_type_info.cc: Likewise. * libsupc++/vterminate.cc: Likewise. * src/c++11/thread.cc: Likewise. From-SVN: r218679