An update on this: Kevin Kofler wrote: > This is only a minor annoyance where a portable fallback exists (we can > just ship the portable C/C++ version in /usr/lib and the SSE2 version in > /usr/lib/sse2, as we are doing with Qt 5 QtDeclarative). The real problem > is software which has no portable fallback at all, such as > Chromium/QtWebEngine or Darktable. This completely screws not only > non-SSE2 x86, but also all secondary architectures, and in some cases such > as Darktable, even the primary architecture ARM. It is unfortunate that > the number of such non- portable software seems increasing lately. > Portability to any and all CPU architectures used to be a big selling > point for Free Software. These days, more and more projects seem happy to > sacrifice this on the altar of performance. :-( I think I have what it takes to get QtWebEngine working on non-SSE2 now: 1. https://bugzilla.redhat.com/show_bug.cgi?id=1293190 2. https://bugzilla.redhat.com/show_bug.cgi?id=1244196#c24 Thankfully, V8 actually does support non-SSE2 x86: Shortly after support was removed from the "ia32" target, it was readded as a separate "x87" one. So only Chromium/QtWebEngine needs patching (because they started requiring SSE2 in their own code). That said, this only helps 32-bit x86. Most secondary architectures are still screwed, because V8 does not have portable C/C++ fallback code (unlike Chromium's own code). Kevin Kofler -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx http://lists.fedoraproject.org/admin/lists/devel@xxxxxxxxxxxxxxxxxxxxxxx
