Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
Install host dependencies.
Import toolchain and SDK.
Create, configure, build and manage apps.
Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench
The problem is probably that the linker eliminates your code, thinking it’s not used; try suppressing the weak definition for TIM6_DAC_IRQHandler in startup_stm32l053xx.s to see if it solves the problem.