This does not seem to be a "Debug" build

[jsulm]

Your Qt libraries are built in Release mode. You need libraries built in Debug mode if you want to debug them.

[ZanyFeet]

@jsulm Thank you. That has solved my problem.

[ElsonAmber]

But what if I can not choose debug mode cause it does not have "debug " to select ?

[jsulm]

@ElsonAmber Then you should add Debug configuration to your project configuration: go to "Projects/Build&Run/Build Settings", then click Add combobox and select Debug.

[DungeonLords]

This does not seem to be a "Debug" build.

Just enable Debug in your cmake in Qt Creator.

[Dane 0]

I am getting the exact same error.
@jsulm How do I "build libraries in Debug mode"?
My project is using qmake, and everything is set to "Debug" mode everywhere that it possibly can be. The effective qmake call is "/home/dane/buildroot/output/host/usr/bin/qmake /home/dane/dev/qt/test_qt_quick_qmake/test_qt_quick_qmake.pro -spec devices/linux-buildroot-g++ CONFIG+=debug CONFIG+=qml_debug && /usr/bin/make qmake_all".
I can debug (set breakpoints in) the QML side of the project on the target but not the C++ side.

[JonB]

@Dane-0
Have you set both as per https://doc.qt.io/qtcreator/creator-debugging-qml.html#mixed-c-qml-debugging ? Other people seem to have had the reverse trouble: C++ debugging works but not QML.

[Dane 0]

@JonB Both "Enable C++" and "Enable QML" are ticked under "Debugger settings" (Projects->Build & Run->Run).
I get the exact same error message as the OP:

This does not seem to be a "Debug" build.
Setting breakpoints by file name and line number may fail.
Section .debug_info: Not found.
Section .debug_abbrev: Not found.
Section .debug_line: Not found.
Section .debug_str: Not found.
Section .debug_loc: Not found.
Section .debug_range: Not found.
Section .gdb_index: Not found.
Section .note.gnu.build-id: Not found.
Section .gnu.hash: Not found.
Section .gnu_debuglink: Not found.

[Dane 0]

Inspecting the compiled executable with objdump reveals that there are no debug sections, and looking at the Makefile generated by QMake I can see that the CFLAGS and CXXFLAGS for the embedded target do not include the -g option.
Why would QMake not be including the -g option when it is being called with CONFIG+=debug? How can I fix or workaround this?

[jsulm]

@Dane-0 Did you try from a clean state: delete everything in build folder, run qmake and then build. Maybe you already built in release mode in same folder, so qmake does not update makefiles.

[Dane 0]

I just found this:
https://bootlin.com/blog/building-a-linux-system-for-the-stm32mp1-setting-up-a-qt5-application-development-environment/#comment-2267741
which seems probably like the correct explanation for what is happening.
I have now set BR2_ENABLE_DEBUG=y in BuildRoot and am busy with a BuildRoot clean / rebuild. Will revert once done (will take some time).

[Dane 0]

Yip that solved it. BR2_ENABLE_DEBUG=y in BuildRoot. Easy once you know! ;-)