make the phony depfile edge order-only

I'm not sure this is semantically different but it's consistent with
how I think about these phony edges.

diff --git a/src/graph.cc b/src/graph.cc
index cb51618..8abaa2a 100644 (file)
--- a/src/graph.cc
+++ b/src/graph.cc
@@ -169,6 +169,7 @@ bool Edge::LoadDepFile(State* state, DiskInterface* disk_interface,
     // but instead will rebuild in that circumstance.
     if (!node->in_edge_) {
       Edge* phony_edge = state->AddEdge(&State::kPhonyRule);
+      phony_edge->order_only_deps_ = 1;
       node->in_edge_ = phony_edge;
       phony_edge->outputs_.push_back(node);
     }