ST Motor Control Workbench and PMSM FOC LIBv4.2
Hi Alex,
I guess for the moment it is impossible, at least with the WEB distribution of the FOC-SDK because part of the distribution is a compiled library, and it is available for IAR or Keil but not for GCC.
Starting from the source code it should be possible and not too much complex to make a port for GCC, but this is another story 
Best regards,
Stefano