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-rw-r--r--lib/spack/spack/graph.py9
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/spack/spack/graph.py b/lib/spack/spack/graph.py
index bebb68d06a..5fb6a9cd23 100644
--- a/lib/spack/spack/graph.py
+++ b/lib/spack/spack/graph.py
@@ -426,10 +426,13 @@ class AsciiGraph(object):
self._back_edge_line(prev_ends, b, i, False, 'left-1')
del prev_ends[:]
prev_ends.append(b)
- self._back_edge_line(prev_ends, -1, -1, False, 'left-2')
- if not self._frontier[i]:
- self._frontier.pop(i)
+ # Check whether we did ALL the deps as back edges,
+ # in which case we're done.
+ collapse = not self._frontier[i]
+ if collapse:
+ self._frontier.pop(i)
+ self._back_edge_line(prev_ends, -1, -1, collapse, 'left-2')
elif len(self._frontier[i]) > 1:
# Expand forward after doing all back connections