CMake target_include_directories(SYSTEM …): SYSTEM option does not seem to work on recent versions of CMake targeting Xcode

Question

We are building an application depending on Boost, and compilation generates a lot of warning \"Class member cannot be redeclared\" in a Boost header (tag_of.hpp).<

Answer 1

This issue looks to only occur for the XCode generator, as CMake believes it doesn't support the isystem flag. I would think the best solution is to report this issue on CMake bug tracker.