Which library contains the following symbol? std::char_tr...

Answer by Ed Zavada
Submitted on 8/29/2005
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The problem is that this should be in the libstdc++ library, but it's not. The solution is to create a new source file (let's call it gcc_fix.cpp) with the following code: #include <cwchar> #include <bits/char_traits.h> namespace std { typedef fpos<mbstate_t> wstreampos; /// char_traits specializations template<> struct char_traits<unsigned short> { typedef unsigned short char_type; typedef unsigned int int_type; typedef streamoff off_type; typedef wstreampos pos_type; typedef mbstate_t state_type; static void assign(char_type& __c1, const char_type& __c2) { __c1 = __c2; } static bool eq(const char_type& __c1, const char_type& __c2) { return __c1 == __c2; } static bool lt(const char_type& __c1, const char_type& __c2) { return __c1 < __c2; } static int compare(const char_type* __s1, const char_type* __s2, size_t __n) { return wmemcmp((wchar_t)__s1, (wchar_t)__s2, __n); } static size_t length(const char_type* __s) { return wcslen((wchar_t)__s); } static const char_type find(const char_type* __s, size_t __n, const char_type& __a) { return (char_type)wmemchr((wchar_t)__s, __a, __n); } static char_type* move(char_type* __s1, const char_type* __s2, int_type __n) { return (char_type)wmemmove((wchar_t)__s1, (wchar_t)__s2, __n); } static char_type copy(char_type* __s1, const char_type* __s2, size_t __n) { return (char_type)wmemcpy((wchar_t)__s1, (wchar_t)__s2, __n); } static char_type assign(char_type* __s, size_t __n, char_type __a) { return (char_type)wmemset((wchar_t)__s, __a, __n); } static char_type to_char_type(const int_type& __c) { return char_type(__c); } static int_type to_int_type(const char_type& __c) { return int_type(__c); } static bool eq_int_type(const int_type& __c1, const int_type& __c2) { return __c1 == __c2; } static int_type eof() { return static_cast<int_type>(WEOF); } static int_type not_eof(const int_type& __c) { return eq_int_type(__c, eof()) ? 0 : __c; } }; } Then you need to compile it and link it into your project. Be sure to use the following flags when you compile: -fno-inline -fno-default-inline -fshort-wchar The no-inline flags ensure that the missing functions are actually generated and put into the object file. The short-wchar flag is essential for making the implementation provided work correctly, otherwise it will be 32 bit wchar_t and the wxxx() functions used in implementation will be working with the correct data sizes

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Question by Code
Submitted on 10/14/2003
Related FAQ: Available C++ Libraries FAQ
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Which library contains the following symbol? std::char_traits<unsigned short>::assign(unsigned short, unsigned, unsigned short) When i compile program with stdc++ library, error message comes with: std::char_traits<unsigned short>::assign(unsigned short, unsigned, unsigned short); undefined reference to `std::char_traits<unsigned short>::copy(unsigned short, unsigned short const, unsigned)' undefined reference to `std::char_traits<unsigned short>::compare(unsigned short const, unsigned short const, unsigned)' ... gcc and glibc are gcc-3.2.2-5 glibc-2.3.2-4.80.6 What happened?

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