[all-commits] [llvm/llvm-project] 7a2423: Reland "[clang][modules] Timestamp-less validation...

[Jan Svoboda via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a242387c950c7060143da6da0e6fb91f36bb458
      https://github.com/llvm/llvm-project/commit/7a242387c950c7060143da6da0e6fb91f36bb458
  Author: Jan Svoboda <jan_svoboda at apple.com>
  Date:   2025-05-19 (Mon, 19 May 2025)

  Changed paths:
    M clang-tools-extra/clangd/ModulesBuilder.cpp
    M clang/include/clang/Serialization/ModuleCache.h
    M clang/include/clang/Serialization/ModuleFile.h
    M clang/include/clang/Tooling/DependencyScanning/DependencyScanningService.h
    M clang/include/clang/Tooling/DependencyScanning/InProcessModuleCache.h
    M clang/lib/Frontend/ASTUnit.cpp
    M clang/lib/Frontend/CompilerInstance.cpp
    M clang/lib/Serialization/ASTReader.cpp
    M clang/lib/Serialization/ASTWriter.cpp
    M clang/lib/Serialization/ModuleCache.cpp
    M clang/lib/Serialization/ModuleManager.cpp
    M clang/lib/Tooling/DependencyScanning/DependencyScanningService.cpp
    M clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
    M clang/lib/Tooling/DependencyScanning/InProcessModuleCache.cpp

  Log Message:
  -----------
  Reland "[clang][modules] Timestamp-less validation API (#139987)"

This reverts commit 18b885f66babff3a10451bc811ffc077d61ed8ee, effectively reapplying #139987. This commit fixes unit tests (for example ASTUnitTest.SaveLoadPreservesLangOptionsInPrintingPolicy) where the `ASTUnit::ModCache` pointer dereferenced within `ASTUnit::serialize()` was null. This commit makes sure each factory function does initialize `ASTUnit::ModCache`.



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