David Timms wrote: > Should I be suggesting to upstream to attempt to detect CPU before > running non-available instructions, eg as part of app startup ? Yes, this is the ONLY solution that's acceptable for binary packaging in distributions. Otherwise, we can only build the most generic version. (The current packages which enable whatever happens to be supported on the build system are completely broken and shouldn't have passed review.) > Can that even be done (reliably) ? Yes, all the packages which have WORKING support for SSE etc. in Fedora do that. See e.g. https://projects.kde.org/projects/kde/kdelibs/repository/revisions/master/entry/solid/solid/backends/shared/cpufeatures.cpp https://projects.kde.org/projects/kde/kdelibs/repository/revisions/master/entry/solid/solid/backends/udev/cpuinfo.cpp https://projects.kde.org/projects/kde/kdelibs/repository/revisions/master/entry/solid/solid/backends/udev/udevprocessor.cpp for the implementation Solid (in kdelibs) uses. Kevin Kofler -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
