Regex++ link problem with VC6 when building with _UNICODE defined

From: Edward Diener (eddielee_at_[hidden])
Date: 2002-08-05 16:37:22

If I build boost 1.28 regex with _UNICODE defined and then attempt to link
the static mssd.lib version with a _UNICODE application using the library, I
get:

boost_regex_vc6_mssd.lib(w32_regex_traits.obj) : error LNK2005: _iswspace
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswalpha
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswupper
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswlower
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswdigit
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswxdigit
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswspace
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswpunct
already defined in libcmtd.lib(_wctype.obj)
boost_regex_vc6_mssd.lib(c_regex_traits.obj) : error LNK2005: _iswcntrl
already defined in libcmtd.lib(_wctype.obj)
Debug/TestRegularExpressionGUIStatic.exe : fatal error LNK1169: one or more
multiply defined symbols found
Error executing link.exe.

This only occurs in the debug multi-threaded static library version.

Has anyone else seen this or know why it might occur ?

If I change the build options for this library from /Od /Gz to /O2,
everything works fine and no linker errors occur.