[Bug libstdc++/64883] FAIL: 17_intro/headers/c++*/all_attributes.cc (test for excess errors) on x86_64-apple-darwin14

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64883

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #4)
> hmm .. so cdefs.h does indeed use __attribute__((no return)) and
> __attribute__((deprecated)).
> 
> (although both are still valid by GCC documentation)

It's valid but the point is that "noreturn" is not a reserved name in any C or
POSIX standard, nor in any C++ standard before C++11, so users can reasonably
expect to be able to define a macro with that name and not get problems. In
order to support such valid usr code system headers should avoid using that
name, and should use the __noreturn__ form that is not a valid macro name for
users to define.

The point of the new test is to ensure libstdc++ itself doesn't contain this
kind of bug ... but it fails because darwin has the bug, even though the
libstdc++ headers no longer have it.

> What about a fixincludes? (not familiar with what level of stuff is feasible
> there).

I think this could be solved with fixincludes, but that seems like something
for stage 1. For now I might just adjust the test to stop it failing.