[all-commits] [llvm/llvm-project] 6655c5: [cmake] Serialize native builds for Make generator...

[arthurqiu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6655c53ff02f0ffca0fcaa3261e14c2a6417d3da
      https://github.com/llvm/llvm-project/commit/6655c53ff02f0ffca0fcaa3261e14c2a6417d3da
  Author: arthurqiu <arthurq at nvidia.com>
  Date:   2025-01-15 (Wed, 15 Jan 2025)

  Changed paths:
    M llvm/cmake/modules/CrossCompile.cmake
    A llvm/cmake/modules/FileLock.cmake
    M llvm/cmake/modules/LLVMExternalProjectUtils.cmake

  Log Message:
  -----------
  [cmake] Serialize native builds for Make generator (#121021)

The build system is fragile by allowing multiple invocation of
subprocess builds in the native folder for Make generator.

For example, during sub-invocation of the native llvm-config,
llvm-min-tblgen is also built. If there is another sub-invocation of the
native llvm-min-tblgen build running in parallel, they may overwrite
each other's build results, and may lead to errors like "Text file
busy".

This patch adds a cmake script that uses file lock to serialize all
native builds for Make generator.



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