Hi,
There is no special trick needed. First time you use the toolchain for a project, VisualGDB will run the gcc executable, extract its specs and build an IntelliSense.props file based on them. The file will be used to configure IntelliSense.
If something interferes with this (e.g. GCC fails to run during specs detection), the IntelliSense.props file may end up empty and won’t work.
You can try rebuilding the toolchain-specific files via VisualGDB Project Properties -> MSBuild Settings -> Regenerate MSBuild-specific files. If this doesn’t help, please try checking View->Other Windows->VisualGDB Diagnostics Console during the toolchain testing – it may explain why it fails.
Another workaround would be to copy the IntelliSense.props file from our ARM toolchain.