Commits on Jan 17, 2021

1. loader: disable import tracing if sys.stderr is unavailable …

   The `FrozenImporter` in `pymod03_importers` uses `trace()` function
   if `sys.flags.verbose` is enabled to trace the imports to `sys.stderr`.
   This results in the following error:
     `Failed to execute script pyiboot01_bootstrap`
   when `sys.stderr` is unavailable (is `None`), which happens on
   Windows when windowed bootloader is used in combination with
   `sys.flags.verbose` enabled (i.e., `--debug imports` or
   `--debug all` is passed on the command-line).
   
   The problem is that while `pyiboot01_bootstrap` does install its
   `NullWriter` for `sys.stderr` when the latter is unavailable, that
   happens too late; there is an `import os` that happens between the
   end of bootstrap process (the `pyimod03_importers.install()` call)
   and monkey-patching `NullWriter()` into `sys.stderr`.
   
   While the problem could also be fixed by moving the `NullWriter`
   initialization before the offending import, simply disabling the
   `trace()` function seems a better option.
   
   Fixes pyinstaller#4213.

   

   rokm committed Jan 17, 2021
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