> 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
Ah, sorry. I tought the consensus was to disable effect of pragma pack at the end of parsing to avoid libgcov incompatibility? Honza
