[C++] Add -d flag to make debugging slightly easier

1 files changed, 2 insertions, 0 deletions

diff --git a/dep.cc b/dep.cc
index 674ac0e..502ec47 100644
--- a/dep.cc
+++ b/dep.cc
@@ -215,6 +215,8 @@ struct RuleMerger {
       if (r == primary_rule)
         continue;
       FillDepNodeFromRule(output, r, n);
+      if (n->loc.filename == NULL)
+        n->loc = r->loc;
     }
   }
 };