Hi, On Fri, 25 Jun 2010, Jan Hubicka wrote:
> I would be also very interested to know how profile feedback works in this > case > (and why it does not work in previous releases). Profiling multi-threading programs needs -fprofile-correction that appeared only in 4.4 (but I have no idea whether 4.4 works for Mozilla or not -- the initial message only speaks about 4.3 and 4.5). Mozilla code also triggered a bug in libgcov ( http://gcc.gnu.org/PR43825 ), and they have probably modified their code to never leave non-default alignment at the end of the TU (I have posted a patch for the libgcov bug [1], but it was not reviewed and does not apply anymore due to build_constructor changes). [1] http://gcc.gnu.org/ml/gcc-patches/2010-05/msg00292.html Cheers, Alexander
