Cannot debug in Qt Creator - no such value

Question

I'm using QtCreator 6.0.2, in ubuntu 22.04.01.

When I try to debug, whenever I hover over a variable I cannot read the actual value. Instead I see <no such value>.

I read this question: Debugging Qt app with Qt Creator: <no such value> which offers some insight. But I think the answer is too old. I have not recompiled gdb, but when I run gdb --configure I can see that it was build with python scripting support:

This GDB was configured as follows: configure
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--with-auto-load-dir=$debugdir:$datadir/auto-load
--with-auto-load-safe-path=$debugdir:$datadir/auto-load
--with-expat
--with-gdb-datadir=/usr/share/gdb (relocatable)
--with-jit-reader-dir=/usr/lib/gdb (relocatable)
--without-libunwind-ia64
--with-lzma
--with-babeltrace
--with-intel-pt
--with-mpfr
--with-xxhash
--with-python=/usr (relocatable)
--with-python-libdir=/usr/lib (relocatable)
--with-debuginfod
--without-guile
--enable-source-highlight
--with-separate-debug-dir=/usr/lib/debug (relocatable)
--with-system-gdbinit=/etc/gdb/gdbinit
--with-system-gdbinit-dir=/etc/gdb/gdbinit.d

what else could cause this? where could I get more info how to fix this? logs? where?

Answer 1

I needed to build a FULL_DEBUG build like this (I'm using cmake):

cmake ../trunk -DCMAKE_BUILD_TYPE=FULL_DEBUG