[PATCH] D125178: Warn if using `elifdef` & `elifndef` in not C2x & C++2b mode

[Aaron Ballman via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGa1545f51a9ef: Warn if using `elifdef` & `elifndef` in not C2x & C++2b mode (authored by ken-matsui, committed by aaron.ballman).

Changed prior to commit:
  https://reviews.llvm.org/D125178?vs=428910&id=428924#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125178/new/

https://reviews.llvm.org/D125178

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/lib/Lex/PPDirectives.cpp
  clang/test/Lexer/Inputs/unsafe-macro-2.h
  clang/test/Lexer/deprecate-macro.c
  clang/test/Preprocessor/elifdef.c
  clang/test/Preprocessor/ext-pp-directive.c
  clang/test/Preprocessor/if_warning.c
  clang/test/Preprocessor/ifdef-recover.c
  clang/test/Preprocessor/macro_misc.c
  clang/test/Preprocessor/macro_vaopt_check.cpp

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