[all-commits] [llvm/llvm-project] 2db239: [C++20] [Modules] Improve the import-and-include p...

[Chuanqi Xu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2db239acd1e4cb61e8c5c55dcc4b08c7d64919b6
      https://github.com/llvm/llvm-project/commit/2db239acd1e4cb61e8c5c55dcc4b08c7d64919b6
  Author: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
  Date:   2025-08-20 (Wed, 20 Aug 2025)

  Changed paths:
    M clang/include/clang/Sema/Sema.h
    M clang/lib/Sema/SemaDecl.cpp
    M clang/lib/Sema/SemaTemplate.cpp
    M clang/test/CXX/drs/cwg279.cpp
    M clang/test/Modules/redundant-template-default-arg2.cpp
    A clang/test/Modules/skip-body-2.cppm

  Log Message:
  -----------
  [C++20] [Modules] Improve the import-and-include pattern

The import and include problem is a long-standing issue with the use of
C++20 modules. This patch tried to improve this by skipping parsing
class and functions if their declaration is already defined in modules.

The scale of the patch itself is small as the patch reuses previous
optimization. Maybe we can skip parsing other declarations in the
future. But the patch itself should be good.



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