http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53113
safety0ff.bugz at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |safety0ff.bugz at gmail dot | |com --- Comment #1 from safety0ff.bugz at gmail dot com 2012-06-08 15:21:52 UTC --- I have this problem too. I'm using Gentoo x86_64, with GNU binutils 2.22 as well. My CPU does support AVX (Intel Sandy Bridge.) It is using the following flags: -g -march=native -mtune=generic -mno-avx -O2 -pipe It is a pain for me because Valgrind doesn't support AVX and compiling programs with my system/default gcc version ends up using the 4.7 libgcc_s.so at run time which will contain AVX code if I compile with AVX enabled.