On 09-12-19 17:19:37, Orcan Ogetbil wrote:
...
> There is a -O2 flag issue that causes some builds to hang. Maybe
> those emacs hangs are related to this bug in gcc
> It happened to 2 of my packages. Removing -O2 makes things compile in
> my packages. (No I didn't do official builds without -O2 flag)
>
> Someone filed a bug about this a while ago but unfortunately gcc
> maintainers don't seem to care much. Anything we can do about this?
> Can we use -O1 instead? The fact is these packages will not compile
> if there will be a mass rebuild. And this needs to be fixed at some
> point before F-13 is out.
`man gcc` suggests that one can find out the differences between -On
levels with:
$ gcc -c -Q -O2 --help=optimizers > /tmp/O2-opts
$ gcc -c -Q -O1 --help=optimizers > /tmp/O1-opts
$ diff /tmp/O{1,2}-opts | grep enabled
(and the man page also lists differences).
Perhaps only one of the added optimizations is the problem and
disabling that one will fix it. A bug report about that particular
optimization on a particular file might get better results. I suppose
I'd disable half of the added optimizations at a time on a problem file
until I found the one that causes the hangs.
--
____________________________________________________________________
TonyN.:' <mailto:tonynelson@xxxxxxxxxxxxxxxxx>
' <http://www.georgeanelson.com/>
--
fedora-devel-list mailing list
fedora-devel-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/fedora-devel-list
