Add cyclic dependence detection.

If a depends on b which depends on a, redo would just freeze.  Now it
aborts with a somewhat helpful error message.

[Updated by apenwarr for coding style and to add a test.]
This commit is contained in:
Robert L. Bocchino Jr 2016-11-27 23:35:28 -08:00 committed by Avery Pennarun
commit 7dd63efb37
8 changed files with 32 additions and 1 deletions

1
t/355-deps-cyclic/b.do Normal file
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@ -0,0 +1 @@
redo-ifchange a