[Development] Updating x86 SIMD support in Qt

[Thiago Macieira]

On Wednesday, 19 January 2022 14:03:41 PST Kevin Kofler via Development wrote:
> Thiago Macieira wrote:
> > Clear Linux attempts to use a heuristic to guess which libraries it thinks
> > are worth keeping the AVX2 version of. To see which ones it thought of
> > qtbase, see https://github.com/clearlinux-pkgs/qtbase/blob/
> > e16f08be736d28351219b05e807a6468ea39341b/qtbase.spec#L5771-L5902
> 
> Why is the baseline libQt5Sql in -extras and the haswell one in -lib?

Unintended.

First of all, this file no longer applies. Clear Linux switched to a different 
solution for providing v3 and v4 content.

The reason is that the previous solution involved the heuristic script[1] I 
had mentioned: it tried to guess whether it was worth keeping the v3 and v4 
files. If it thought it wasn't worth, it simply deleted the file. Then 
Autospec wouldn't package it.

The qtbase-extras package exists to enable Quassel Core without bringing the 
full X11 dependency. It is a manual solution. See
https://github.com/clearlinux-pkgs/qtbase/blob/master/extras

So my guess is that an update to the compiler caused it to generate different 
code in QtSql that the script now concluded was worth keeping. As it isn't 
mentioned in the "extras" file, it got packaged as a regular library.

[1] https://github.com/clearlinux/clr-avx-tools

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel DPG Cloud Engineering