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/ninja.cc b/src/ninja.cc
index b75ddbf..d4e697f 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -119,8 +119,7 @@ bool CollectTargetsFromArgs(State* state, int argc, char* argv[],
   } else {
     for (int i = 0; i < argc; ++i) {
       string path = argv[i];
-      if (!CanonicalizePath(&path, err))
-        return false;
+      CanonicalizePath(&path);
       Node* node = state->LookupNode(path);
       if (node) {
         targets->push_back(node);