[Bug tree-optimization/80794] constant objects can be assumed to be immutable

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80794

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2017-05-17
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Does the C++ standard really say so?  Because I can happily do

 const_cast<int&>(S.i) = 1;

usually the middle-end has to be forgiving here (also consider 'mutable').