[PATCH] D123885: Revert "Revert "Revert "[clang][pp] adds '#pragma include_instead'"""

[Christopher Di Bella via Phabricator via cfe-commits]

cjdb created this revision.
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> Includes regression test for problem noted by @hans.
> is reverts commit 973de71 <https://reviews.llvm.org/rG973de7185606a21fd5e9d5e8c014fbf898c0e72f>.
>
> Differential Revision: https://reviews.llvm.org/D106898

Feature implemented as-is is fairly expensive and hasn't been used by
libc++. A potential reimplementation is possible if libc++ become
interested in this feature again.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123885

Files:
  clang-tools-extra/clangd/Selection.cpp
  clang-tools-extra/pseudo/lib/Lex.cpp
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/include/clang/Basic/SourceManager.h
  clang/include/clang/Lex/HeaderSearch.h
  clang/include/clang/Lex/Lexer.h
  clang/include/clang/Lex/Preprocessor.h
  clang/include/clang/Lex/PreprocessorLexer.h
  clang/lib/Frontend/Rewrite/RewriteModernObjC.cpp
  clang/lib/Lex/Lexer.cpp
  clang/lib/Lex/PPDirectives.cpp
  clang/lib/Lex/PPLexerChange.cpp
  clang/lib/Lex/Pragma.cpp
  clang/test/PCH/ms-pch-macro-include_instead-regression.c
  clang/test/Preprocessor/Inputs/include_instead/bad-syntax.h
  clang/test/Preprocessor/Inputs/include_instead/file-not-found.h
  clang/test/Preprocessor/Inputs/include_instead/non-system-header.h
  clang/test/Preprocessor/Inputs/include_instead/private-x.h
  clang/test/Preprocessor/Inputs/include_instead/private1.h
  clang/test/Preprocessor/Inputs/include_instead/private2.h
  clang/test/Preprocessor/Inputs/include_instead/private3.h
  clang/test/Preprocessor/Inputs/include_instead/public-after.h
  clang/test/Preprocessor/Inputs/include_instead/public-before.h
  clang/test/Preprocessor/Inputs/include_instead/public-empty.h
  clang/test/Preprocessor/include_instead.cpp
  clang/test/Preprocessor/include_instead_file_not_found.cpp

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