CSA: Error on analyzing simple C++ on macOS

Steps to reproduce:

• create simple simple Plain C++ app from template (qbs build)
• switch to ClangStaticAnalyzer
• start analyzing

Current result:

• Issues pane displays an error "Clang Static Analyzer: Not all files could be analyzed"

Not sure what exactly causes this, but it seems the #include <iostream> is the main cause (judging by the output displayed in Application Output).

Might be correct anyhow, but the error is quite irritating.

Note: the same project gets analyzed without problems when using qmake as build system (or on Linux instead of macOS)