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

[Ken Matsui via Phabricator via cfe-commits]

ken-matsui updated this revision to Diff 428358.
ken-matsui added a comment.

Update the code as reviewed


Repository:
  rG LLVM Github Monorepo

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

https://reviews.llvm.org/D125178

Files:
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/lib/Lex/PPDirectives.cpp
  clang/test/Preprocessor/ext-c2x-pp-directive.c
  clang/test/Preprocessor/ext-cpp2b-pp-directive.cpp

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