http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47574
--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-02-01 18:32:44 UTC --- I cannot reproduce it on x86_64-apple-darwin10 with all the options/versions I have tried (including gcc version 4.6.0 20101106 (experimental) [trunk revision 166401]). One possibility could be a miscompilation due to gmp/mpfr/mpc: I use GMP version 5.0.1, MPFR version 3.0.0, MPC version 0.8.2 Do you know a minimal use of gdb?