[cfe-dev] Locating the root cause of the error detected by UBSan

[Zhoulai Fu@Gmail via cfe-dev]

Hi,

I am running a robotic application on Ubuntu16. The application is compiled
with Clang's UndefinedBehavior sanitizer with an "-g" option. I got a brief
error message which seemed to indicate a bug somewhere:

    /usr/include/x86_64-linux-gnu/qt5/QtCore/qglobal.h:517:55:
    runtime error: -nan is outside the range of representable values of
type 'int'

My guess is that the bug is from my application, not from the more mature
QT. How could I determine which line in the source (which I can access) of
the application that triggers this runtime error?

Thanks.

Zhoulai
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