[Mingw-notify] [ mingw-Bugs-664369 ] Missing wide character support in MinGW 3.2?

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Bugs item #664369, was opened at 2003-01-08 08:16
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Category: MinGW
Group: Known bugs
>Status: Pending
>Resolution: Later
Priority: 5
Submitted By: Terje Slettebø (tslettebo)
Assigned to: Earnie Boyd (earnie)
Summary: Missing wide character support in MinGW 3.2?

Initial Comment:
Hi.

I've tried searching the mingw-users mailing list archive, 
but it appears the search function doesn't work, now, so 
therefore I'm posting, here.

When trying to compile a program that uses 
std::wstring, I get a link-error about missing definition. 
std::string works fine, though. I've used MinGW 3.2 that 
comes with Dev-C++. It appears to be a MinGW related 
problem, as I've heard from others who had the same 
problem.

Also, when testing for _GLIBCPP_USE_WCHAR_T on 
MinGW, it's conspicuously absent, and, searching on 
Google, I found this posting 
(http://www.geocrawler.com/mail/msg.php3?
msg_id=9057201&list=6013) from June, 2002:

"wide char streams aren't fully supported yet in new 
libstdc++.a.  I'm working on it."

Is this still the case? I've heard that GCC 3.2, with 
library, now supports wide characters.


Regards,

Terje


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>Comment By: Earnie Boyd (earnie)
Date: 2003-03-18 11:35

Message:
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Well, it needs more work.  I.E. Someone needs to implement
with a patch to GCC.

Earnie.

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Comment By: Earnie Boyd (earnie)
Date: 2003-03-18 11:29

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Now the vfwscanf, vswscanf, and vwscanf abort is a bug in
cwchar that should have used _GLIBCPP_HAVE_VFWSCANF,
_GLIBCPP_HAVE_VSWSCANF and _GLIBCPP_HAVE_VWSCANF to filter
their use.  Then mingw32/btis/c++config.h can be changed to
define _GLIBCPP_USE_WCHAR_T.

Earnie.

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Comment By: Steve Lhomme (robux4)
Date: 2003-03-18 10:39

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This very simple example gives the following error :

#include <string>

int main(int argc, char *argv[])
{
    std::wstring TestString;
    return 0;
}

main.o(.text+0x26):main.cpp: undefined reference to
`std::basic_string<wchar_t, std::char_traits<wchar_t>,
std::allocator<wchar_t> >::basic_string()'
main.o(.text+0x35):main.cpp: undefined reference to
`std::basic_string<wchar_t, std::char_traits<wchar_t>,
std::allocator<wchar_t> >::~basic_string()'


PS: #define _GLIBCPP_USE_WCHAR_T 1
add the following errors :

g++.exe -c main.cpp -o main.o -I"D:/DEV-CPP/include" 
-I"D:/DEV-CPP/include/c++"  -I"D:/DEV-CPP/include" 
-I"D:/Dev-Cpp/include/c++/mingw32"  

In file included from D:/DEV-CPP/include/c++/bits/fpos.h:45,
                 from
D:/DEV-CPP/include/c++/bits/char_traits.h:46,
                 from D:/DEV-CPP/include/c++/string:47,
                 from main.cpp:2:
D:/DEV-CPP/include/c++/cwchar:157: `vfwscanf' not declared
D:/DEV-CPP/include/c++/cwchar:159: `vswscanf' not declared
D:/DEV-CPP/include/c++/cwchar:161: `vwscanf' not declared

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Comment By: Earnie Boyd (earnie)
Date: 2003-03-18 09:57

Message:
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Perhaps this will resolve the issue

#define _GLIBCPP_USE_WCHAR_T 1
#include <string>

Earnie.

----------------------------------------------------------------------

Comment By: Earnie Boyd (earnie)
Date: 2003-03-18 09:51

Message:
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None of you give a small example.  Where's the example?

Earnie.



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Comment By: Nigel Stewart (nigels)
Date: 2003-03-18 09:08

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This problem is also observed in Cygwin.
A solution to this would be much appreciated.

Regards,

Nigel Stewart

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Comment By: Steve Lhomme (robux4)
Date: 2003-03-18 08:58

Message:
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I'm having the same problem.
This problem also exist in gcc-darwin (used in OSX).

But this code works under Linux+GCC 3.2 (Mandrake 9.0).

Do you plan to solve it someday ?
How is GCC supposed to handle Unicode handling otherwise ?

----------------------------------------------------------------------

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