Boost C++ Libraries: Ticket #603: regex linking error with VC 7.1

John Maddock — Sat, 15 Apr 2006 10:18:12 GMT

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I can reproduce this, unfortunately I don't see any
solution: when building with the mutibyte character set the
instantiations of char_traits<unsigned short> in
usinstances.cpp are absolutely required.  And when building
with the Unicode character set they cause the issues you
spotted.  The only solution I can see is for you to comment
out the lines starting with #ifdef _DLL_CPPLIB in
usinstances.cpp if you want to use that build configuration
(of course other build configurations may then result in
those symbols being undefined).
I'm going to leave this issue open, in the hopes that
someone might come up with a solution.
John Maddock.

status changed

John Maddock — Sat, 15 Apr 2006 17:19:12 GMT

status assigned → closed

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Apologies, but ignore everything in my last message: you can
work around this quite easily by building the regex lib
without /Zc:wchar_t, or by adding the line:
template<> _CRTIMP2 std::size_t __cdecl char_traits<unsigned
short>::length(unsigned short const*);
to the end of the other specializations in usinstances.cpp
(this is the fix that's going into cvs any minute now).
John Maddock

nmwcosteve — Tue, 21 Nov 2006 21:43:20 GMT

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I have taken the fix as it appears in the 1_34 alpha.  It does not appear to be working, at least for me in VC8.  I get LNK2005 errors:
error LNK2005: "public: static unsigned int __cdecl std::char_traits<unsigned short>::length(unsigned short const *)" (?length@?$char_traits@G@std@@SAIPBG@Z) already defined in msvcprtd.lib(MSVCP80D.dll)
error LNK2005: "public: __thiscall std::allocator<unsigned short>::allocator<unsigned short>(void)" (??0?$allocator@G@std@@QAE@XZ) already defined in msvcprtd.lib(MSVCP80D.dll)
I need to build Unicode, with /Zc:wchar_t- to be compatible with our existing codeset.
Perhaps this is a different problem?