[all-commits] [llvm/llvm-project] 3f193b: [C++20] [Modules] Don't diagnose duplicated implic...

[Chuanqi Xu via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 3f193bcc5a72f05a4b2d5f74a0ee16a76b3b32f2
      https://github.com/llvm/llvm-project/commit/3f193bcc5a72f05a4b2d5f74a0ee16a76b3b32f2
  Author: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
  Date:   2024-08-13 (Tue, 13 Aug 2024)

  Changed paths:
    M clang/lib/Serialization/ASTReaderDecl.cpp
    A clang/test/Modules/pr102349.cppm
    A clang/test/Modules/pr102360.cppm

  Log Message:
  -----------
  [C++20] [Modules] Don't diagnose duplicated implicit decl in multiple named modules (#102423)

Close https://github.com/llvm/llvm-project/issues/102360
Close https://github.com/llvm/llvm-project/issues/102349

http://eel.is/c++draft/basic.def.odr#15.3 makes it clear that the
duplicated deinition are not allowed to be attached to named modules.

But we need to filter the implicit declarations as user can do nothing
about it and the diagnostic message is annoying.

(cherry picked from commit e72d956b99e920b0fe2a7946eb3a51b9e889c73c)



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