Neither of the code models (built-in and Clang) work when using Android NDK r10e.

The error is usually something like this:

qglobal.h:45:12: fatal error: 'type_traits' file not found
QDebug:1:10: note: in file included from [...]

This is displayed by the yellow warning sign at the top. As a result, the code model is completely broken for the rest of the file.

In general, standard C++ headers cannot be found. Only standard C headers work. So this:

#include <cstdio>

appears underlined with the pop-up error message being "no such file or directory".

But this:

#include <stdio.h>

works fine.

The current stable Creator version (4.5.1) is affected, as is the 4.6 beta1 (installed though the maintenance tool), and the latest rc1 snapshot (Feb 15, from download.qt.io).

Upgrading to NDK r16b fixes the issue. However, as far as I know, the last recommended NDK to use with Qt is r10e, which is recommended by Qt's documentation:

https://doc.qt.io/qt-5/androidgs.html

And I suppose this is because of this:

https://github.com/android-ndk/ndk/issues/67

So it would seem that it's very important to keep the code model working with NDK r10e.