On 12/10/2015 02:26 PM, Mathieu Malaterre wrote: > On Thu, Dec 10, 2015 at 12:08 PM, Mathieu Malaterre > <mathieu.malaterre@xxxxxxxxx> wrote: >> >> I am trying to track a change in behavior in between gcc 4.4.7 >> (CentOS/x86_64) and gcc 4.9.2 (fedora/x86_64). The result of a complex >> computation (floating point involved) is slightly different in between >> those two. >> >> Does anyone knows if there was a major change in floating point >> computation of std::log, std::pow, std::ceil, std::sqrt or std::exp in >> between those versions? My input is a raw binary (no ASCII parsing >> involved anywhere in the code). I've compiled code in debug on both >> side (only option -g is used nothing else). >> >> Sorry if this is very broad, I need pointer to get started. > > Just for reference. I've scp'ed the executable file from CentOS over > my fedora installation and it runs as expected. So the issue is within > one of the system lib on CentOS (libc/libm/libstdc++6 ?) So probably not GCC, then. I'm guessing this is actually glibc. Surely, though, minor differences are not unexpected? Andrew.
