[all-commits] [llvm/llvm-project] cdbba1: [libc] Add --write-if-changed switch to hdrgen/mai...

[Roland McGrath via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cdbba15c6cd53291358bf95a9a9057042fcbf163
      https://github.com/llvm/llvm-project/commit/cdbba15c6cd53291358bf95a9a9057042fcbf163
  Author: Roland McGrath <mcgrathr at google.com>
  Date:   2025-01-08 (Wed, 08 Jan 2025)

  Changed paths:
    M libc/cmake/modules/LLVMLibCHeaderRules.cmake
    M libc/utils/hdrgen/main.py

  Log Message:
  -----------
  [libc] Add --write-if-changed switch to hdrgen/main.py (#122037)

This avoids touching the output file when it hasn't changed.  The
cmake build integration now uses this so that touching a .yaml or
.h.def file in ways that don't affect the generated header output
won't cause unnecessary recompilations.



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