colleague asked me yesterday about the fundamental difference
between using SRC_URI to point at a local source tree to build, versus
inheriting externalsrc, and when to use each.

  from what i read, there's no serious difference as, by default, both
techniques copy the source tree under WORKDIR -- the major difference
is that externalsrc can be configured to build in the source directory
via EXTERNALSRC_BUILD, which is something i would discourage anyway.

  apart from that, is there an argument for one over the other
depending on the circumstances?

rday
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