DennisOSRM/Project-OSRM — pull request #1066 by alex85k (2014-06-05 17:56:04+00:00)
Title: Obtain char* from boost::filesystem::path on all systems

The definition of c_str function in boost is
``const value_type* c_str() const ``
and on some compilers and runtimes in can be not char* (wchar_t* on Windows, for example), To guarantee getting char*, it is recommended to do .string().c_str()
http://stackoverflow.com/questions/11352641/boostfilesystempath-and-fopen
patch from
https://github.com/DennisOSRM/Project-OSRM/pull/998