[PATCH] D38954: [Sema] -Wzero-as-null-pointer-constant: don't warn for system macros other than NULL.

[Roman Lebedev via Phabricator via cfe-commits]

lebedev.ri updated this revision to Diff 120285.
lebedev.ri added a comment.

- Rebased
- Handle `-Wsystem-headers` properly, as per irc disscussion.

It was suggested that `findMacroSpelling()` might be slow, and `isNullPointerConstant()` should be used, but i'm not sure any of the `NullPointerConstantKind`'s can replace direct check for `NULL` specifically...


Repository:
  rL LLVM

https://reviews.llvm.org/D38954

Files:
  docs/ReleaseNotes.rst
  lib/Sema/Sema.cpp
  test/SemaCXX/Inputs/warn-zero-nullptr.h
  test/SemaCXX/warn-zero-nullptr.cpp

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