repo_description: Empowering everyone to build reliable and efficient software.
repo_topics: compiler language rust
code: #!/usr/bin/env python3
  # Some systems don't have `python3` in their PATH. This isn't supported by x.py directly;
  # they should use `x` or `x.ps1` instead.
  
  # This file is only a "symlink" to bootstrap.py, all logic should go there.
  
  # Parts of `bootstrap.py` use the `multiprocessing` module, so this entry point
  # must use the normal `if __name__ == '__main__':` convention to avoid problems.
  if __name__ == "__main__":
      import os
      import sys
      import warnings
      from inspect import cleandoc
  
      major = sys.version_info.major
      minor = sys.version_info.minor
  
      # If this is python2, check if python3 is available and re-execute with that
      # interpreter. Only python3 allows downloading CI LLVM.
      #
      # This matters if someone's system `python` is python2.
      if major < 3:
          try:
              os.execvp("py", ["py", "-3"] + sys.argv)
          except OSError:
              try:
                  os.execvp("python3", ["python3"] + sys.argv)
              except OSError:
                  # Python 3 isn't available, fall back to python 2
                  pass
  
      # soft deprecation of old python versions
      skip_check = os.environ.get("RUST_IGNORE_OLD_PYTHON") == "1"
      if not skip_check and (major < 3 or (major == 3 and minor < 6)):
          msg = cleandoc(
              """
              Using python {}.{} but >= 3.6 is recommended. Your python version
              should continue to work for the near future, but this will
              eventually change. If python >= 3.6 is not available on your system,
              please file an issue to help us understand timelines.
  
              This message can be suppressed by setting `RUST_IGNORE_OLD_PYTHON=1`
          """.format(major, minor)
          )
          warnings.warn(msg, stacklevel=1)
  
      rust_dir = os.path.dirname(os.path.abspath(__file__))
      # For the import below, have Python search in src/bootstrap first.
      sys.path.insert(0, os.path.join(rust_dir, "src", "bootstrap"))
  
      import bootstrap
  
      bootstrap.main()
  