[all-commits] [llvm/llvm-project] e58737: [C++20] [Module] Support extern C/C++ semantics

[Chuanqi Xu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e587372f85105b85ae790fbe129b5d609d6dfb76
      https://github.com/llvm/llvm-project/commit/e587372f85105b85ae790fbe129b5d609d6dfb76
  Author: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
  Date:   2021-12-08 (Wed, 08 Dec 2021)

  Changed paths:
    M clang/include/clang/Basic/Module.h
    M clang/include/clang/Lex/ModuleMap.h
    M clang/include/clang/Sema/Sema.h
    M clang/lib/Lex/ModuleMap.cpp
    M clang/lib/Sema/SemaDeclCXX.cpp
    M clang/lib/Sema/SemaModule.cpp
    A clang/test/CXX/module/module.unit/p7/Inputs/CPP.cppm
    A clang/test/CXX/module/module.unit/p7/Inputs/h1.h
    A clang/test/CXX/module/module.unit/p7/Inputs/h2.h
    A clang/test/CXX/module/module.unit/p7/Inputs/h4.h
    A clang/test/CXX/module/module.unit/p7/Inputs/h5.h
    A clang/test/CXX/module/module.unit/p7/t1.cpp
    A clang/test/CXX/module/module.unit/p7/t2.cpp
    A clang/test/CXX/module/module.unit/p7/t3.cpp
    A clang/test/CXX/module/module.unit/p7/t4.cpp
    A clang/test/CXX/module/module.unit/p7/t5.cpp
    A clang/test/CXX/module/module.unit/p7/t6.cpp
    A clang/test/CodeGenCXX/Inputs/module-extern-C.h
    A clang/test/CodeGenCXX/module-extern-C.cpp

  Log Message:
  -----------
  [C++20] [Module] Support extern C/C++ semantics

According to [module.unit]p7.2.3, a declaration within a linkage-specification
should be attached to the global module.
This let user to forward declare types across modules.

Reviewed by: rsmith, aaron.ballman

Differential Revision: https://reviews.llvm.org/D110215