[CMake] Header and CXX.includecache - how first comes in second

[Mikhail Pridushchenko]

Hello!

I have a problem with include files dependencies in my C++ project: 
iostream system header (for example) is being cached by CMake in 
CXX.includecache file for some targets. Also there are no
     #include <iostream>
lines in my sources.

I wonder if there is any way to figure out where it could come from?

Thank you.

--
Mikhail Pridushchenko