[all-commits] [llvm/llvm-project] cc4ec6: [C++20] [Modules] Diagnose redeclarations from dif...

[Chuanqi Xu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cc4ec6daf0d4f43110e8220d542c1155b8c1ef51
      https://github.com/llvm/llvm-project/commit/cc4ec6daf0d4f43110e8220d542c1155b8c1ef51
  Author: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
  Date:   2024-06-24 (Mon, 24 Jun 2024)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/Serialization/ASTReaderDecl.cpp
    M clang/test/Modules/no-eager-load.cppm
    A clang/test/Modules/same-decl-in-different-modules.cppm

  Log Message:
  -----------
  [C++20] [Modules] Diagnose redeclarations from different modules

[basic.link]/p10:

> If two declarations of an entity are attached to different modules,
> the program is ill-formed

But we only implemented the check for ODR. In this patch, we tried to
diagnose the redeclarations from different modules.



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