[boost] [challenge] detect MSVC8 SP1 with the preprocessor

Hello, as you probably know there's a Service Pack for Visual Studio 2005 which fixes a significant number of bugs. Unfortunately _MSC_VER is 1400 for MSVC8 with and without Service Pack, so there is no straightforward way for a library to find out whether SP1 fixes are available or not. The release notes of that Service Pack mention a fixed bug in the preprocessor messing up line counting in certain situations, so it seems there could be a way to implement a detection mechanism in the preprocessor on top of it... Solutions anyone? Regards, Tobias