[PATCH] D132779: Enforce module decl-use restrictions and private header restrictions in textual headers

[Richard Smith - zygoloid via Phabricator via cfe-commits]

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Per the documentation, these restrictions were intended to apply to textual headers but previously this didn't work because we decided there was no requesting module when the `#include` was in a textual header.

      

A `-cc1` flag is provided to restore the old behavior for transitionary purposes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132779

Files:
  clang/include/clang/Basic/LangOptions.def
  clang/include/clang/Driver/Options.td
  clang/include/clang/Lex/Preprocessor.h
  clang/lib/Lex/PPDirectives.cpp
  clang/test/Modules/Inputs/declare-use/module.map
  clang/test/Modules/Inputs/declare-use/textual.h
  clang/test/Modules/declare-use-textual.cpp

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