The latest release of GNU MCU Eclipse includes a new project template for the SiFive boards. Currently the HiFive1, E31Arty and E51Arty are supported.
Fully functional blinky and empty projects are generated.
For more details, plese see the GNU MCU Eclipse plug-ins v4.2.1-201711101735 released post.
The easiest way to test the templates is to install the GNU MCU Eclipse IDE for C/C++ Developers package.
More details are available in the How to install the GNU MCU Eclipse plug-ins? page.