[all-commits] [llvm/llvm-project] 51786e: [clang][modules] Only compute affecting module map...

[Jan Svoboda via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 51786eb5bfc30e7eff998323a9ce433ec4620383
      https://github.com/llvm/llvm-project/commit/51786eb5bfc30e7eff998323a9ce433ec4620383
  Author: Jan Svoboda <jan_svoboda at apple.com>
  Date:   2024-04-10 (Wed, 10 Apr 2024)

  Changed paths:
    M clang/lib/Serialization/ASTWriter.cpp

  Log Message:
  -----------
  [clang][modules] Only compute affecting module maps with implicit search (#87849)

When writing out a PCM, we compute the set of module maps that did
affect the compilation and we strip the rest to make the output
independent of them. The most common way to read a module map that is
not affecting is with implicit module map search. The other option is to
pass a bunch of unnecessary `-fmodule-map-file=<path>` arguments on the
command-line, in which case the client should probably not give those to
Clang anyway.

This makes serialization of explicit modules faster, mostly due to
reduced file system traffic.



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