id summary reporter owner description type status milestone component version severity resolution keywords cc 13596 VC++ 15 compiler warning C4127: conditional expression is constant Volker Schöch Barend Gehrels "I'm using Microsoft Visual Studio 15.6.0 to compile boost 1.67.0. I use compiler flag /W4. The following warnings (which we declared an error for our project) occur in geometry: **\boost_1_67_0\boost\geometry\algorithms\detail\overlay\sort_by_side.hpp(369): warning C4127: conditional expression is constant** **\boost_1_67_0\boost\geometry\algorithms\detail\overlay\handle_colocations.hpp(836): error C4127: conditional expression is constant** **\boost_1_67_0\boost\geometry\algorithms\detail\overlay\traversal.hpp(804): error C4127: conditional expression is constant** **\boost_1_67_0\boost\geometry\io\wkt\write.hpp(165): error C4127: conditional expression is constant**" Bugs closed To Be Determined geometry Boost 1.67.0 Problem duplicate warning error C4127