I had a Progaurd file for release. Removing that fixed the problem: keepattributes LineNumberTable,SourceFile renamesourcefileattribute SourceFile

@SergeyK12 said in Qt creator console project isnt worked in release mode, but worked in debug!: And everything worked! Glad you found out. Please don't forget to mark your post as solved!

Check folder, where you are building your release (where *.exe is generated): does it contains some Qt's *.dll's? If yes: there is two ways to resolve your problem: Remove all Qt *.dll's and run your application from Qt Creator (then Qt Creator will take all Qt *.dll's from folder, where Qt is installed). Or add all needed Qt *.dll's with correct folder structure to folder with your release *.exe (to do it for Windows release use windeployqt tool: https://doc.qt.io/qt-6/windows-deployment.html ) Why you have such error from the compilator? Because you have some Qt *.dll's in your release folder (beside the *.exe), but not all needed (e.g. you have only Qt6Core.dll). So Qt Creator will find this dll and will try to find other dll's in your release folder. Qt Creator will not check its installation directory to get dll's. But if you have no Qt *.dll's in your release folder, then Qt Creator will find them in its installation directory.

Thanks @jsulm !

After few researches and some help from internal, it appears that my links to libraries ain't clean enough wich leads to those random behaviours. So i'm working on making it cleaner for x32/x64 debug and release. Thanks a lot for your help ! You made my mind way sharper !

It could be. Although it was working fine in previous release with Qt 5.5.1.

Dear all, Juste an update on this issue for anyone it could help. The issue came from the INCPATH section of the makefile. Though similar beetween makefile.debug and makefile.release it seems that the compiler (or linker) could not interpret relative path ('../../../') when in release mode (whereas it works ok in debug). I could not find a solution to directly fix this issue so I now modify the makefile once created/updated in order to replace occurences of relative paths by absolute path. This is done using a batch file that I execute after the qmake.exe step (step added in the compilation steps of the project configuration) Thanks to those who tried to help