Eclipse CDT complains about unresolved functions but still builds successfully

Question

The following C++ application compiles and runs successfully within Eclipse CDT but the IDE is still reporting an error stating:

Answer 1

The directory /usr/include (where wchar.h resides) is definitely listed within the Include path as otherwise the application would not compile

I guess this directory is listed only in compiler Include path. This directory has to be listed in Eclipse C++ parser Include path as well, to resolve functions correctly.