As per summary, check attached build log.
Created attachment 194370 [details]
After fixing bug #273370 in gnucap-0.35.20090611 I can't reproduce this on and amd64 system with gcc 4.4 and glibc 2.10. You have an idea where the difference with your system would be?
Forget it, I thought this was for gnucap.
I bumped iverilog to 0.9.1 and it apparently fixed this bug. I also fixed LDFLAGS while I was at it.