[all-commits] [llvm/llvm-project] b2b463: [C++20] [Modules] Add signature to the BMI recordi...

[Chuanqi Xu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b2b463bd8f6b21f040b80c4493682cf74f8dced5
      https://github.com/llvm/llvm-project/commit/b2b463bd8f6b21f040b80c4493682cf74f8dced5
  Author: Chuanqi Xu <yedeng.yd at linux.alibaba.com>
  Date:   2024-04-30 (Tue, 30 Apr 2024)

  Changed paths:
    M clang/include/clang/Serialization/ASTWriter.h
    M clang/lib/Serialization/ASTWriter.cpp
    A clang/test/Modules/force-transitive-changes.cppm
    M clang/test/Modules/no-transitive-source-location-change.cppm

  Log Message:
  -----------
  [C++20] [Modules] Add signature to the BMI recording export imported
modules

After https://github.com/llvm/llvm-project/pull/86912,
for the following example,

```
export module A;
export import B;
```

The generated BMI of `A` won't change if the source location in `A`
changes. Further, we plan avoid more such changes.

However, it is slightly problematic since `export import` should
propagate all the changes.

So this patch adds a signature to the BMI of C++20 modules so that we
can propagate the changes correctly.



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