[yocto] Question about automatic debug package generation

[Brad Litterell]

My recipe builds and ships an executable in /foo/bin/fooapp

FILES_${PN} += "/foo/bin/*"

WARNING: QA Issue: foo: Files/directories were installed but not shipped
  /foo/bin/.debug
  /foo/bin/.debug/fooapp

This file doesn't appear in the image, but is in the package folder:
./package/foo/bin/.debug/fooapp

It appears something is automatically creating these .debug files during the packaging steps, but the corresponding file isn't under packages-split.

Can someone point me to a place to learn more about how these are created and packaged?

Thanks,
Brad

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