On Wed, Feb 22, 2012 at 08:46:19AM +0100, Roman Rakus wrote: > On 02/16/2012 05:33 PM, Jakub Jelinek wrote: > >For just -O3 or -O2 -ftree-vectorize we could perhaps have some knob in > >the spec files to request those extra flags, for PGO it really requires > >some work from the packager (but e.g. bash/grep/awk, perhaps perl/python > >etc. would definitely improve, gcc itself is already built with PGO). > > What kind of work? I have tried to build bash with added -O2 > -ftree-vectorize -fprofile-generate, but the build fails with many > undefined reference to `__gcov_*. That would be probably because -lgcov isn't linked in. When using -fprofile-generate, you need to pass that switch not just during compilation, but also when linking the binaries (or libraries) that contain -fprofile-generate compiled objects. Jakub -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
