On Thu, 10 Nov 2016 11:30:47 +0100 Jan Kurik <jkurik@xxxxxxxxxx> wrote: > = Proposed System Wide Change: Fedora 26 C/C++ Compilation Flags > Updates = https://fedoraproject.org/wiki/Changes/Fedora26CFlags > > Change owner(s): > * Florian Weimer <fweimer AT redhat DOT com> > > This change updates the default C/C++ compilation flags, as determined > by the redhat-rpm-config package. > > > > == Detailed Description == > This change covers the following modifications to the default C and > C++ compiler flags in the redhat-rpm-config package. > > * Drop -mtune=atom on i686: This flag was added to improve performance > on the Intel Bonnell microarchitecture. Such CPUs are rare these days. > In addition, many users of the i686 packages download them for use > within a 64-bit x86_64 installation, and only a small part of these > Fedora installations use Atom CPUs. Current microarchitectures for > Atom CPUs are different from the original Bonnell microarchtecture and > would need different GCC flags for tuning, but many current Atom-based > devices cannot run Fedora because Fedora does not support their 32-bit > UEFI boot environment. We are going to change the default -mcpu for s390(x) from the current -mcpu=z9-109 to -mcpu=z10. z10 is the minimum level various projects require - llvm/clang, OCaml, pypy3, ... Unfortunately we can't go higher because our community guest VM is still running on a z10 machine. Dan _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
