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.
Rebuilding the index in Eclipse did not resolve the errors. However, a re-export from CubeMX and reimport into an Eclipse workspace with no spaces in the path did seems to do the trick.