There may be an incompatibility with 2012 and 2014. Some 2012 things still exist somewhere. It's possible that those elements are still tagged as 2012 even in the later releases. You might want to try on a different computer (that hasn't run FRC java before) with a freshly created template to be more certain.
Code:
undefined symbol _ZN5nFPGA15nFRC_2012_1_6_47tGlobal6createEPl.
On a note related to the beginning of your post, I was able to get FRC in Eclipse working. I started with
this guide but had to change a few things around (like I didn't use their zips) to make things work perfectly. If people are interested in how I did this I can make a more detailed guide.