Current QEMU toolchain used in Coin are build from Qt 6.1 (with few patches on top) and they are using GCC 10.2.
These should be updated to latest version from dev, which will bring GCC 13.1.
The toolchain will update QEMU as well, so the update will affect running of test on both embedded linux and QNX platforms.
Updated qemu toolchains are available at https://ci-files02-hki.ci.qt.io/packages/jenkins/enterprise/b2qt/yocto/dev/
These are built with Yocto 4.3 (nanbield)
As part of the update, it might make sense to switch to use full system emulation (QTQAINFRA-5108) instead of running tests in user mode.