message: Fix the TF wheel build on Windows.
diff: @@ -379,13 +379,18 @@ def flatbuffer_py_strip_prefix_srcs(name, srcs = [], strip_prefix = ""):
  )
  def _concat_flatbuffer_py_srcs_impl(ctx):
  - # Merge all generated python files.
  - command = "find '%s' -name '*.py' -exec cat {} + | sed '/import flatbuffers/d'"
  - command += " | sed '1s/^/import flatbuffers\\'$'\\n/' > %s"
  + # Merge all generated python files. The files are concatenated and import
  + # statements are removed. Finally we import the flatbuffer runtime library.
  + # IMPORTANT: Our Windows shell does not support "find ... -exec" properly.
  + # If you're changing the commandline below, please build wheels and run smoke
  + # tests on all the three operating systems.
  + command = "echo 'import flatbuffers\n' > %s; "
  + command += "for f in $(find %s -name '*.py'); do cat $f | sed '/import flatbuffers/d' >> %s; done "
  ctx.actions.run_shell(
  inputs = ctx.attr.deps[0].files,
  outputs = [ctx.outputs.out],
  command = command % (
  + ctx.outputs.out.path,
  ctx.attr.deps[0].files.to_list()[0].path,
  ctx.outputs.out.path,
  ),
  