Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
i've solved the issue
it is related to the fact that the IDE is generating the makefiles in every build, disabling "Generate Makefiles automatically" solves the issue.