bitbake: bb.utils: add get_referenced_vars

Given a start expression, bb.utils.get_referenced_vars returns the
referenced variable names in a quasi-BFS order (variables within the
same level are ordered aribitrarily).

For example, given an empty data store:

    bb.utils.get_referenced_vars("${A} ${B} ${d.getVar('C')}", d)

returns either ["A", "B", "C"], ["A", "C", "B"], or another
permutation.

If we then set A = "${F} ${G}", then the same call will return a
permutation of [A, B, C] concatenated with a permutation of [F, G].

This method is like a version of d.expandWithRefs().references that
gives some insight into the depth of variable references.

(Bitbake rev: 076eb5453ca35b8b75b8270efb989d5208095b27)

Signed-off-by: Chris Laplante <chris.laplante@agilent.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions