On Tue, Aug 1, 2017 at 1:02 AM, Florian Weimer <fweimer@xxxxxxxxxx> wrote: > On 07/11/2017 10:26 PM, Florian Weimer wrote: >> I ran into this unannounced change: >> >> https://fedoraproject.org/wiki/Changes/Stop_Building_i686_Kernels >> >> If this is accepted, all x86 hardware on which Fedora can run will >> support SSE2, and we should reflect that in the i686 build flags. > > Current GCC does not seem to provide a way to enable SSE2 while > preserving stack alignment, but not requiring it for SSE2 access to > stack variables. As a result, enabling SSE2 will break tons of > third-party software which is not compliant with the increased stack > alignment which was introduced as a silent, breaking change to the i386 > psABI about 15 years ago. > > I don't think it's worth fixing GCC because i386 support is legacy only > anyway, so I'd suggest to leave things as they are (and even scale back > the SSE2 use within glibc). I think it's worth filing the GCC bug report. The GCC developers should fix this issue. It may still be worth scaling back SSE2 support in 32-bit glibc, though. _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
