[Bug middle-end/49754] Wuninitialized does not work with structs/unions/arrays

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49754

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-10-04
                 CC|                            |manu at gcc dot gnu.org
          Component|c                           |middle-end
            Summary|Let gcc warn about all      |Wuninitialized does not
                   |uninitialized variables     |work with
                   |                            |structs/unions/arrays
     Ever Confirmed|0                           |1

--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-10-04 08:23:24 UTC ---
This is a problem of representation. Struct/unions/arrays are represented as
memory operations, and Wuninitialized does not (generally) work on them. It may
warn in some corner cases if the accesses can be converted into scalar
variables, but in general it doesn't work.

I am not even sure if the current middle-end representation can tell whether
the memory is uninitialized and never initialized up to the point of use. That
would be the first thing to implement.