[all-commits] [llvm/llvm-project] 8c389f: [clang] Report direct module deps for explicitly b...

[Michael Spencer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8c389f3eb2e713c2195a4d3dd4b6894fab783a10
      https://github.com/llvm/llvm-project/commit/8c389f3eb2e713c2195a4d3dd4b6894fab783a10
  Author: Michael Spencer <bigcheesegs at gmail.com>
  Date:   2026-04-07 (Tue, 07 Apr 2026)

  Changed paths:
    M clang/include/clang/Frontend/DependencyOutputOptions.h
    M clang/include/clang/Frontend/Utils.h
    M clang/include/clang/Options/Options.td
    M clang/include/clang/Serialization/ASTReader.h
    M clang/lib/DependencyScanning/DependencyScannerImpl.cpp
    M clang/lib/DependencyScanning/ModuleDepCollector.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/lib/Frontend/DependencyFile.cpp
    M clang/lib/Frontend/Rewrite/FrontendActions.cpp
    M clang/lib/Serialization/ASTReader.cpp
    M clang/test/ClangScanDeps/generate-modules-path-args.c
    A clang/test/Driver/module-file-direct-deps.c
    M clang/test/Driver/pch-deps.c
    A clang/test/Modules/dependency-gen-direct-module-deps.m
    M clang/test/Modules/dependency-gen-pch.m

  Log Message:
  -----------
  [clang] Report direct module deps for explicitly built modules (#190757)

Implicitly built modules do not include PCM paths in .d files because
the compiler is the one managing them, but for explicitly built
modules the build system needs to know about them so that if one is
deleted the build system will rebuild it.

Explicitly built modules should only report direct dependencies, as
the build system knows about each PCM in the module graph. This adds
`-fmodule-file-deps=direct` to support that, and changes dependency
scanning to use this in the explicit build commands it outputs.

Assisted-by: claude-opus-4.6



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