System/Path/Windows: Change GetRootDirectory to return file:/// instead of C:/.

llvm-svn: 118502

Author: Bigcheese

llvm/include/llvm/System/Path.h

@@ -89,7 +89,7 @@ namespace sys {
       /// Construct a path to the root directory of the file system. The root
       /// directory is a top level directory above which there are no more
       /// directories. For example, on UNIX, the root directory is /. On Windows
-      /// it is C:\. Other operating systems may have different notions of
+      /// it is file:///. Other operating systems may have different notions of
       /// what the root directory is or none at all. In that case, a consistent
       /// default root directory will be used.
       static Path GetRootDirectory();

llvm/lib/System/Win32/Path.inc

@@ -233,9 +233,9 @@ Path::GetTemporaryDirectory(std::string* ErrMsg) {
 // FIXME: the following set of functions don't map to Windows very well.
 Path
 Path::GetRootDirectory() {
-  Path result;
-  result.set("C:/");
-  return result;
+  // This is the only notion that that Windows has of a root directory. Nothing
+  // is here except for drives.
+  return Path("file:///");
 }
 
 void