http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56801
--- Comment #3 from Mike Spear <spear at cse dot lehigh.edu> --- Patrick, I just tried again, with gcc --version: gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3 Result: $ gcc -std=gnu11 -g -O2 -fgnu-tm -pthread -c testcase.c -o testcase.o testcase.c: In function 'slabs_adjust_mem_requested': testcase.c:29:6: internal compiler error: in expand_call_tm, at trans-mem.c:2280 Could it be a Ubuntu thing?