CODEWITHSUNDEEP
c++winapiwindows-7stlwdk
user541686
user541686

Reputation: 210525

Is wchar_t Supported in C++ WDK STL? I get Unresolved External Symbol's :(

I'm compiling a trivial C++ file Temp.cpp:

#include <string>
int main() { std::wstring s; }

With the command line:

cl.exe /MD /Iinc\api\crt\stl60 /Iinc\crt /Iinc\api C:\Temp.cpp
       /LibPath:lib\wxp\i386 /LibPath:lib\crt\i386
       /link /LibPath:lib\wxp\i386 /LibPath:lib\crt\i386

in the WDK 7.1 Windows XP Free Build Environment.

I get link errors like (LNK2019):

unresolved external symbol "__declspec(dllimport) public: __thiscall
    std::basic_string<wchar_t,struct std::char_traits<wchar_t>,
    class std::allocator<wchar_t> >::~basic_string<wchar_t,
    struct std::char_traits<wchar_t>,class std::allocator<wchar_t> >(void)"
    (__imp_??1?$basic_string@_WU?$char_traits@_W@std@@V?$allocator
     @_W@2@@std@@QAE@XZ) referenced in function _main

If I use string instead of wstring, it works.

What's the cause of the problem? How can I use wchar_t-based types in my source file?

Upvotes: 1

Views: 1073

Answers (2)

MSalters
MSalters

Reputation: 179917

VC6 doesn't support the wchar_t type , it had a typedef for unsigned short. The linker would only be able to find std::basic_string<unsigned short> in the "stl60" lib.

Upvotes: 0

Martyn Lovell
Martyn Lovell

Reputation: 2276

The likely fix would be to set /Zc:wchar_t- to turn off wchar_t as an intrinsic type. STL6 doesn't have great support for /Zc:wchar_t which is the default since at least VC7.1, perhaps earlier.

Meta: Please don't use the STL60 version of STL. This version from 1998 lacks a large number of bug fixes, performance improvements and standards-conformance work that you can find in a modern STL. If you are using the VC compiler toolchain the free VC++ express includes STL.

Martyn

Upvotes: 6

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