I am getting an annoying warning when building boost_math.dll AND generating Microsoft VS 8.0 'managed' code /clr:pure, even at warning level 1. (clr code is needed because we are building a Windows .net form in C# to demonstrate Math function and Statistics Distribution using John Maddock's Math Toolkit in C++. Aside - with a lot of annoying wrapping, John has made this work). The message is: C4793 'vararg' : causes native code generation for function 'void boost::detail::sp_enable_shared_from_this(const boost::detail::shared_count &,...)' Adding this #pragma to the top of our boost_math.cpp file does NOT suppress it. #pragma warning(disable: 4793) // 'vararg' : causes native code generation for function 'void boost::detail::sp_enable_shared_from_this(const boost::detail::shared_count &,...)' Is this worrying? Is there something wrong with the pushing and popping of warnings? Someone has already done some message suppression for SGI I see. #ifdef sgi // Turn off: the last argument of the varargs function "sp_enable_shared_from_this" is unnamed # pragma set woff 3506 #endif Is this the right way to deal with it for MSVC in shared_prt.hpp? #ifdef _MSC_VER #pragma warning(push) #pragma warning(disable: 4793) // 'vararg' : causes native code generation for function 'void boost::detail::sp_enable_shared_from_this(const boost::detail::shared_count &,...)' #endif inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... ) { } #ifdef sgi # pragma reset woff 3506 #endif #ifdef _MSC_VER #pragma warning(pop) #endif With this it gives a clean compile :-)) Could/should this is added to the normal Boost shared_prt.hpp? Or is there a cleaner solution that avoids vararg? Paul --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS pbristow@hetp.u-net.com