[Boost-bugs] [Boost C++ Libraries] #5769: fstream.hpp facilities not usable for paths containing characters outside of the current Windows ("ANSI") code page on GCC (mingw/mingw-w64)

Subject: [Boost-bugs] [Boost C++ Libraries] #5769: fstream.hpp facilities not usable for paths containing characters outside of the current Windows ("ANSI") code page on GCC (mingw/mingw-w64)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-08-10 13:25:49

#5769: fstream.hpp facilities not usable for paths containing characters outside
of the current Windows ("ANSI") code page on GCC (mingw/mingw-w64)
-------------------------------+--------------------------------------------
 Reporter:  sam@…              |       Owner:  bemandawes
     Type:  Bugs               |      Status:  new       
Milestone:  To Be Determined   |   Component:  filesystem
  Version:  Boost 1.46.1       |    Severity:  Problem   
 Keywords:                     |  
-------------------------------+--------------------------------------------
 GCC's libstdc++ does not follow MS VC++'s lead in extending std::fstream
 and std::filebuf to take paths made up of wchar_t strings.

 boost::filesystem::filebuf and {i,o,}fstream rely on this functionality.
 In its absence, they fall back to converting the path's wchar_t
 representation into a char string in the Windows ("ANSI") code page of the
 current system locale (actually, they incorrectly use the current thread
 codepage, see #5592).

 The fstream facilities are therefore unusable with GCC when you build a
 Windows program that manipulates paths containing characters that are not
 representable in the current Windows code page.

 When compiled with the GCC from mingw-w64, the attached test will fail to
 create a file. Examination with Process Monitor reveals that the program
 tries to create a file with the name of "umbre??a", because the ☂
 character is not representable in any Windows code page.

 GCC provides a __gnu_cxx::stdio_filebuf, which may be constructed from a
 FILE* or file descriptor; this could be used in concert with MSVCRT's
 _wfopen or _wopen functions, by boost::filesystem::{i,o,}fstream to
 provide the missing functionality.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5769>
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