[Bug preprocessor/41540] -dM -E doesn't #define __FILE__

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41540

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |documentation, patch
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2017-02-07
           Assignee|unassigned at gcc dot gnu.org      |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
A documentation-only patch posted for review:
https://gcc.gnu.org/ml/gcc-patches/2017-02/msg00560.html