[all-commits] [llvm/llvm-project] 75c6f4: [clang] Introduce `ModuleCache::write()` (#188877)

[Jan Svoboda via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 75c6f4791c8c1031e5ab170a9987c4d300026e1e
      https://github.com/llvm/llvm-project/commit/75c6f4791c8c1031e5ab170a9987c4d300026e1e
  Author: Jan Svoboda <jan_svoboda at apple.com>
  Date:   2026-04-01 (Wed, 01 Apr 2026)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticCommonKinds.td
    M clang/include/clang/Frontend/CompilerInstance.h
    M clang/include/clang/Frontend/FrontendActions.h
    M clang/include/clang/Serialization/ModuleCache.h
    M clang/lib/DependencyScanning/InProcessModuleCache.cpp
    M clang/lib/Frontend/CompilerInstance.cpp
    M clang/lib/Frontend/FrontendActions.cpp
    M clang/lib/Serialization/ModuleCache.cpp

  Log Message:
  -----------
  [clang] Introduce `ModuleCache::write()` (#188877)

This introduces new `ModuleCache` interface for writing PCM files.
Together with #188876, this will enable adding a caching layer into the
`InProcessModuleCache` implementation, hopefully reducing IO cost.
Moreover, this makes it super explicit that the PCM is written before
its timestamp, which is an important invariant that we've broken before.



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