[PATCH] D157572: [clang] Add `[[clang::library_extension]]` attribute

[Nikolas Klauser via Phabricator via cfe-commits]

philnik created this revision.
philnik added reviewers: aaron.ballman, erichkeane.
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This allows standard libraries to mark symbols as extensions, so the compiler can generate extension warnings when they are used.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157572

Files:
  clang/include/clang/AST/DeclBase.h
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/AST/DeclBase.cpp
  clang/lib/Sema/CodeCompleteConsumer.cpp
  clang/lib/Sema/SemaAvailability.cpp
  clang/lib/Sema/SemaDeclAttr.cpp
  clang/lib/Sema/SemaStmt.cpp
  clang/test/SemaCXX/attr-library-extension.cpp
  clang/tools/libclang/CIndex.cpp

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