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 I remove the replace the newlib-nano with newlib by removing the "nano.specs" in the linker settings it works. Thanks for pointing me towards the right direction.