[boost] Gcc and -Wundef

Hi guys, I tried a couple of compilations on the CVS trunk and it appears that gcc's -Wundef option is basically unusable, due to most usages of BOOST_WORKAROUND not being prefixed by a corresponding "defined expression". Now, I'm thinking: if a suitable pragma exists (I'll look it up) could we just disable that warning at the config system level? I know this impacts non-boost user code as well but, whatever that implies, we have a precedent for Visual C++: // turn off the warnings before we #include anything #pragma warning( disable : 4503 ) // warning: decorated name length exceeded Opinions? --Gennaro.