http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51098
--- Comment #6 from Stupachenko Evgeny <evstupac at gmail dot com> 2011-11-16 10:32:31 UTC --- Bootstrap fail was caused by later commit (revision 181246): ------------------------------------------------------------------------ r181246 | rth | 2011-11-10 04:29:38 +0400 (Thu, 10 Nov 2011) | 1 line Changed paths: M /trunk/libitm/ChangeLog M /trunk/libitm/acinclude.m4 M /trunk/libitm/config/x86/x86_avx.cc M /trunk/libitm/config.h.in M /trunk/libitm/configure M /trunk/libitm/configure.ac libitm: Work around assembler missing AVX insns. 181154 aldyh fi 181154 aldyh 181246 rth case "${target_cpu}" in 181246 rth i345686 | x86_64) 181246 rth { $as_echo "$as_me:${as_lineno-$LINENO}: checking if the assembler supports AVX" >&5 181246 rth $as_echo_n "checking if the assembler supports AVX... " >&6; } 181246 rth if test "${libitm_cv_as_avx+set}" = set; then : 181246 rth $as_echo_n "(cached) i345686 shoud be i[3456]86 That is why HAVE_AS_AVX was not set for i686 target_cpu.