[Bug c++/69850] [6 Regression] unnecessary -Wnonnull-compare warning

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69850

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2016-02-17
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 37723
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37723&action=edit
gcc6-pr69850.patch

Untested fix.  Another possibility is to STRIP_NOPS and if it is this, set
ifexp to integer_one_node.  But we need the TREE_NO_WARNING stuff anyway,
because e.g. in function with nonnull parameter other than this, that at some
point is changed, the comparison would be still desirable and valid.