make CanonicalizePath report an error on empty path

Fixes part of issue 121, but the fix exposed a further issue.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/util.h b/src/util.h
index 58a0a3a..c9e06f4 100644
--- a/src/util.h
+++ b/src/util.h
@@ -31,7 +31,7 @@ void Warning(const char* msg, ...);
 void Error(const char* msg, ...);
 
 /// Canonicalize a path like "foo/../bar.h" into just "bar.h".
-void CanonicalizePath(string* path);
+bool CanonicalizePath(string* path, string* err);
 
 /// Create a directory (mode 0777 on Unix).
 /// Portability abstraction.