[Bug c/85290] New: Defining identifiers to themselves in system headers prevents diagnostics from being emitted.

[ad...@tho-otto.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85290

            Bug ID: 85290
           Summary: Defining identifiers to themselves in system headers
                    prevents diagnostics from being emitted.
           Product: gcc
           Version: 7.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ad...@tho-otto.de
  Target Milestone: ---