Errors and builds?
Simular Elipse problem here:
http://stackoverflow.com/questions/8148235/eclipse-cdt-shows-semantic-errors-but-compilation-is-ok
Related content
Development tools for Zephyr on STM32
Workbench 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.