id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11138	filesystem::path::canonical() failed with junction points on Windows	yanggehua@…	Beman Dawes	"Hi, 

In my recent use of filesystem in Boost 1.57, the call of path::canonical() on Windows 7 returns an invalid path if part of the path in question is a junction point.  

This failure can be reproduced with the following code: 
{{{#!C++
  // ""C:\Gehua"" is a junction point of ""D:\Gehua""
  fs::path work(""d:/Gehua/work"");
  fs::path work_canonical(fs::canonical(work));
  std::wstring s = fs::canonical(work_canonical).native();
  // True path passes
  assert(s == L""d:/Gehua\\work"");

  // try the junction path 
  fs::path work_junction(""c:/Gehua/work"");
  // this passes
  assert(fs::exists(work_junction));

  s = fs::canonical(work_junction).native();
  // this one fails!
  // s has value ""c:/Gehua\\Gehua\\work""
  assert(s == L""d:/Gehua\\work"");
}}}

The call returned a value of ""c:/Gehua\\Gehua\\work"", which was wrong. "	Bugs	new	To Be Determined	filesystem	Boost 1.57.0	Problem		filesystem, path, canonical