Why does a program that runs properly in debug mode crash in release mode?

duncan98

hi,Why does a program that runs properly in debug mode crash in release mode?

J.Hilk

@duncan98
99% chance, its missing initialisation

JoeCFD

This is not a Qt problem. Many reasons. The first thing I would do is to check the code to see if there is something like
#If DEBUG
bla bla
#endif
which may be needed for release as well.
Run cppcheck to check your code to see if there is any issue.
Or
strace your app to check where the problem shows up.

CP71

@duncan98
Hi
When I see this behavior, I immediately think of a variable that is not set (without default value).

As someone has advised us you can try
https://github.com/asmaloney/asmCrashReport

duncan98

Is this a null pointer exception?

CP71

@duncan98
Yep, it is possible!
https://en.wikipedia.org/wiki/Segmentation_fault

As first step try to check your pointers

CP71

@duncan98
Null pointer or invalid pointer (random value of pointer)!

mchinand

You may be able to debug this issue by using a ReleaseWithDebInfo configuration if you are using CMake or add the following to your .pro file if you are still using qmake (and build in Release mode). Then run it in the debugger within QtCreator. If it's an uninitialized pointer, it should show you on what line an uninitialized object is trying to be dereferenced.

CONFIG += force_debug_info

duncan98

hi, @mchinand
My compiler shows mingw8.1, and the editor is unable to debug breakpoint information in release mode.
The CONFIG + = force_debug_info,
This has no effect on the configuration file