On terça-feira, 10 de dezembro de 2013 19:52:35, Hausmann Simon wrote: > Would it be possible to build libQtQml for i686/SSE2, install it into > lib/sse2 and call it a day? I don't think it's worth shipping a pure i386 > version of that library that's not going to perform on the hardware in > question - more than 10 years old and no chance for GPU acceleration the > way Qt needs it.
Options:
1) distro builds Qt once with default flags
[recommended by the Qt Project for specialised distros]
=> all libs use SSE2 and QtQml generates SSE2 code
2) distro builds Qt once with -no-sse2 flags
[not recommended at all]
=> all libs compiled without SSE2
=> QtQml generates SSE2 code and will not work on older machines
3) distro build Qt once with -no-sse2 and then some libs with -config sse2
[recommended by the Qt Project for general distros]
=> most libs compiled without SSE2, a few with SSE2 code
=> QtQml generates SSE2 code and will not work on older machines
=> for that reason, it's pointless to install it and any library that
requires it outside of lib/sse2. Do only the sse2 builds.
If we apply the change I mentioned in the other email, we change cases 2 and
3:
2bis) distro builds Qt once with -no-sse2 flags
=> all libs compiled without SSE2
=> QtQml generates interpreted code only
3bis) distro builds Qt once with -no-sse2 and then some libs with -config sse2
=> most libs compiled without SSE2, a few with SSE2 code
=> the non-SSE2 QtQml will generate interpreted code, the SSE2 one will
generate SSE2 code and will be used only in machines less than 14 years
old
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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