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rtems-bin2c: Allow adding a license header

Summary

Purpose

If files generated by rtems-bin2c are committed into a repository, there is no license information. It would be great if the tool would provide some options to add a license.

For an example, the device tree file in the i.MXRT BSP is processed with bin2c and the resulting source file has been added as a C file to avoid the necessity for a working dtc on all platforms to build RTEMS. The C file is missing a license.

Result

There are multiple possible directions for a feature like that:

  • Take an extra file that is prepended to the resulting file as a license header.
  • Read the license comments from a file (same or different one to the file that is processed) and use that as a header.
  • Provide only some RTEMS-relevant default license headers.