semantic change: allow reaching into parent directories in paths

This allows generating build files in a subdirectory of your source tree.
- Change CanonicalizePath to accept this.
- CanonicalizePath no longer has an error condition, so change it to a void
  function.

I profiled the result against Chrome and it might be ~100ms slower, but that
might just be Chrome's size working against me.  In any case I think there
are lower-hanging performance fruit elsewhere.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/graph.cc b/src/graph.cc
index 13927fe..0f687ea 100644
--- a/src/graph.cc
+++ b/src/graph.cc
@@ -161,8 +161,7 @@ bool Edge::LoadDepFile(State* state, DiskInterface* disk_interface,
   // Add all its in-edges.
   for (vector<string>::iterator i = makefile.ins_.begin();
        i != makefile.ins_.end(); ++i) {
-    if (!CanonicalizePath(&*i, err))
-      return false;
+    CanonicalizePath(&*i);
 
     Node* node = state->GetNode(*i);
     inputs_.insert(inputs_.end() - order_only_deps_, node);