Setting up Qt Source Code debugging

Diracsbracket

Hi.
In an attempt to debug my Could not create shader problem, I tried to setup Qt Creator for Qt Source Code debugging, with the idea of setting
a breakpoint at the warning line to find out which thread/part of the program is causing the problem.

I configured Qt Creator's Debugger settings for Qt Source debugging as follows:

I installed GDB Multiarch and setup the Kit to use it:

Then, I put a breakpoint in the file source file concerned:
Qt/5.15.0/Src/qtbase/src/gui/opengl/qopenglshaderprogram.cpp at the line that generates the warning.

This does not work though. The breakpoint is not hit before the message gets printed.

I tried the same approach once on Windows to debug an Android problem a couple of Qt Versions ago, and that seemed to work.

What am I missing here? I am using the latest Qt Creator and targetting Qt 5.15.0 on Raspbian Buster/Pi3B+.

Diracsbracket

Since I cross-built Qt for Pi on my own machine, the Source path and Target path are the same really:

So actually, no Source Path Mapping is actually needed at all, and the above mapping can be removed.

I can jump into Qt Source Code correctly during the remote debug session now.

jsulm

@Diracsbracket You have:

/home/qt
/home/umagi

Why do you have "qt" user? Does your user account have read access there?

Diracsbracket

@jsulm said in Setting up Qt Source Code debugging:

/home/qt

Hi...
You're right, the Source Path as shown above is for debugging Qt apps intended for the host platform, not the target platform, which means I must rebuild a debug version of Qt for the Pi.

However, I just tried the -debug-and-release option of the configure script (starting from a clean slate), but strangely, the configure summary still indicates Mode .....release?

Configure summary:

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: devices/linux-rasp-pi3-g++ (arm, CPU features: neon)
Target compiler: gcc 8.3.0
Configuration: cross_compile enable_new_dtags largefile neon shared shared rpath release c++11 c++14 c++17 c++1z concurrent dbus reduce_exports stl
Build options:
  Mode ................................... release

jsulm

@Diracsbracket Did you rerun configure from a clean state?

Diracsbracket

@jsulm
Yes, I did delete the shadow build dir completely before rerunning configure.

Diracsbracket

Ahh.... At the bottom of the configure summary is this:

ERROR: Feature 'debug_and_release' was enabled, but the pre-condition 'config.darwin || config.win32' failed.

So the debug-and-release does not seem to be supported for linux? I will use -debug then.

Diracsbracket

Since I cross-built Qt for Pi on my own machine, the Source path and Target path are the same really:

So actually, no Source Path Mapping is actually needed at all, and the above mapping can be removed.

I can jump into Qt Source Code correctly during the remote debug session now.