Some ASM in the cpu detection code of GImp development versions is not PIC-safe. The included patch fixes building with -fPIC (hardened-gcc). Thanks to pipacs in #pax (freenode) for the fix.
Created attachment 24669 [details, diff] gimp cpu-access PIC fixes
fyi, I've already filed this upstream, and its been tentatively scheduled for 2.0.1. Please add the patch to our tree temporarily. Thanks :)
use the patch that went into gimp CVS (it is different from yours what i get from the comment?) and apply it as you please.
CVS fix committed, thanks foser.