[all-commits] [llvm/llvm-project] 2e9977: [C++20] [Modules] Treat module linkage as formal l...

[Chuanqi Xu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2e9977c2815653c141c6c060c4e0ab6c0db27911
      https://github.com/llvm/llvm-project/commit/2e9977c2815653c141c6c060c4e0ab6c0db27911
  Author: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
  Date:   2023-03-13 (Mon, 13 Mar 2023)

  Changed paths:
    M clang/include/clang/AST/Decl.h
    M clang/lib/AST/Decl.cpp
    A clang/test/Modules/inconsistent-export.cppm
    M clang/unittests/AST/DeclTest.cpp

  Log Message:
  -----------
  [C++20] [Modules] Treat module linkage as formal linkage only

Close https://github.com/llvm/llvm-project/issues/61321

There are two linkage modes in clang now: one for internal linkage and
one for formal linkage. The internal linkage is for the implementation
details and the formal linkage is for the consistency with the C++
standard.

Since we previously implemented the strong ownership for modules, the
module linkage is not meaningful for linkers any more. So the module
linkage should only be used for formal linkage.