Importing Cube example programs: F7-discovery
The solution may exist here:
http://mcuoneclipse.com/2015/03/29/solving-the-8192-character-command-line-limit-on-windows/
But... I'm not sure how it would affect the SW4STM32 toolchain, or if indeed this is already a part of it. Or perhaps SW4STM32 is using an older version of the build tools?
Will have another look in a couple of weeks.