[Bug c++/60924] __attribute__((no_sanitize_address)) and friends should (only?) be allowed at function definitions

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60924

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>I think we should disallow __attribute__((no_sanitize_address)) at declarations because:
> 1) it's more consistent

More consistent with what, it would be very inconsistent with the rest of GCC's
attributes.

>2) it's much more readable, there's no "implicit attribute applied somewhere else"
>   when looking at the code of a function/method.

This is just like where is the comment which describes what the arguments do. 
Is there is only one coding style in this world?

>4) applying/removing the attribute would usually result in fewer recompilations (2000+ TUs in my case)

This is a C++ problem rather than a GCC issue :).  Modules for the win.