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.
If you generate the project with CubeMX the missing declarations exists within the startup file.
If you create a project from scratch in AC6 the declarations are missing.