In boost 1.47.0 filesystem v3, boost::filesystem::absolute only appends the relative path to base path. It should also remove "./" from relative paths and "backtrack" on base path if relative path contains "../../" etc.

For example, 

Input:

  "d:\current\path"

  ".\..\relative\path"

Result obtained:

  "d:\current\path\.\..\relative\path"

Desired result:

  "d:\current\relative\path"