On 05/19/2015 04:56 PM, Gena Makhomed wrote:
On 19.05.2015 2:31, Kir Kolyshkin wrote:
could you please explain the problem in more details?
is there a special reason why you use a different gcc Version for the
kernels you provide
cat /proc/version
Linux version 2.6.32-042stab106.4 (root@kbuild-rh6-x64) (gcc version
4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Fri Mar 27 15:19:28
MSK 2015
that either CentOS6 or RHEL6 ship with:
gcc -v
gcc-Version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC)
problem is difference between gcc 4.4.6 20120305 and gcc 4.4.7-11
Can you please be more specific of what the exact problem is
(unfortunately I forgot my crystal ball at home today)?
gcc 4.4.6-4 contains many bugs, which already fixed in 4.4.7-11
and these gcc bugs can originate bugs in OpenVZ kernel,
compiled with this very old and buggy gcc version.
Theoretically, you are right -- updated gcc version should be better,
less buggy etc.
Practically, we are not aware of any single issue with gcc 4.4.6 and
RHEL6-based
kernel -- neither in our kernel, nor in upstream (i.e. RHEL6). We saw
some bugs
in the past that were caused by gcc miscompiling the kernel source code,
but it
was always a version of gcc not from RHEL.
more specific:
https://gcc.gnu.org/bugzilla/buglist.cgi?bug_status=RESOLVED&resolution=FIXED&target_milestone=4.4.7
- list of problem reports (PRs) from GCC's bug tracking system that
are known to be fixed in the 4.4.7 release. This list might not be
complete (that is, it is possible that some PRs that have been fixed
are not listed here)
also see output of # rpm -q --changelog gcc | less
to see Red Hat backports and fixes over gcc version 4.4.7
If you could point out to any fixes made specifically to fix
kernel-related problems,
we'd be very grateful. Otherwise, this becomes "would be nice to use
updated gcc"
rather than "it's a must to use updated gcc" sort of thing.
Having said that, we'll probably update our build environments anyway.
Kir.
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