[all-commits] [llvm/llvm-project] be5c66: [clang] Improve module out of date error message (...

[Michael Spencer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: be5c66d97d7977bd9fa31b1a0e78196ecbb6e52b
      https://github.com/llvm/llvm-project/commit/be5c66d97d7977bd9fa31b1a0e78196ecbb6e52b
  Author: Michael Spencer <bigcheesegs at gmail.com>
  Date:   2025-02-24 (Mon, 24 Feb 2025)

  Changed paths:
    M clang/lib/Serialization/ModuleManager.cpp
    M clang/test/Modules/explicit-build.cpp

  Log Message:
  -----------
  [clang] Improve module out of date error message (#128103)

When a pcm file has a different size or modification time than it had
when it was written to another module's IMPORT table Clang emits:

`<pcm> is out of date and needs to be rebuilt: module file out of date`

This is difficult to understand what's happening because there are a lot
of reasons that a module file can be out of date. This changes the
latter part of that message to:

`module file has a different size or mtime than expected`

Which makes it clearer what the issue is. For future work it would be
nice if a more detailed explanation of the issue could be emitted as a
note instead.



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