sberg added a comment.

> Final macros will always warn on redefinition, including situations with 
> identical bodies and in system headers.

But

  #define NULL syntax error
  #pragma clang final(NULL)
  #include <stddef.h>
  void * p = NULL;

does not produce any warnings/errors for me and indicates that NULL silently 
gets redefined as a null pointer constant in stddef.h.  Is that intended?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D108567/new/

https://reviews.llvm.org/D108567

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