[Bug c/85290] 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

--- Comment #2 from Thorsten Otto <ad...@tho-otto.de> ---
Created attachment 43880
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43880&action=edit
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