From 374686dd65f0036a298def3885d44a9fed194701 Mon Sep 17 00:00:00 2001
From: Evan Martin <martine@danga.com>
Date: Wed, 10 Nov 2010 08:39:21 -0800
Subject: [PATCH] add diagnostic before assert

---
 ninja_jumble.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ninja_jumble.cc b/ninja_jumble.cc
index 71e2840..214a419 100644
--- a/ninja_jumble.cc
+++ b/ninja_jumble.cc
@@ -317,7 +317,10 @@ void State::AddInOut(Edge* edge, Edge::InOut inout, const string& path) {
     node->out_edges_.push_back(edge);
   } else {
     edge->outputs_.push_back(node);
-    assert(node->in_edge_ == NULL);
+    if (node->in_edge_) {
+      fprintf(stderr, "multiple rules generate %s\n", path.c_str());
+      assert(node->in_edge_ == NULL);
+    }
     node->in_edge_ = edge;
   }
 }
-- 
2.7.4