Re: Qt5 switching qreal from float to double on arm*
On Sat, 02 Nov 2013 15:29:05 -0300 Lisandro Damián Nicanor Pérez Meyer perezme...@gmail.com wrote: Hi! Starting from Qt 5.2.0 (most probably from rc1 and definitely not from beta1 currently in experimental) Qt5 will switch qreal from float to double on arm*. We have the option to keep some archs in float by passing a compilation parameter. I've done so for armel and sh4, so only armhf will switch to double. Of course we are still on time to discuss this, and this is the reason of this mail. What do you think WRT the above changes? FWIW, I was a bit sceptical about switching qreal to double. True this would minimise the patches some packages would need on armhf, but OTOH, I don't know what would happen to packages that use both GL graphics and Qt at the same time. All armhf platforms support only OpenGLES and not full OpenGL stack which supports *only* 32-bit floats. However Lissandro just told me on IRC that GL-stuff on Qt5 switched to float for exactly that reason). So apart from speed I don't see a reason for not going that route. If anything, FPU in recent armv7-a systems has become increasingly better so this will be better in a couple of years (it will still suck on a Cortex-A8, but will be less apparent on a Cortex-A15 or better). FTR, I don't think many apps would mind that much. Most apps that would actually care for speed/accuracy would use float/double directly and not qreal, for most it would save us the burden of patching (eg. scribus, qgis). So unless, we find some particular strong cases for *not* switching to double, I'd vote in favour of that. Regards Konstantinos pgptRxGgvRfTP.pgp Description: PGP signature
Re: please update patches / investigate build failures for gcc-4.7 snapshot builds
On 19 December 2011 14:55, Konstantinos Margaritis mar...@genesi-usa.com wrote: On 19 December 2011 01:55, Matthias Klose d...@debian.org wrote: Please have a look at the gcc-4.7 package in experimental, update patches (hurd, kfreebsd, ARM is fixed in svn), and investigate the build failures (currently ia64, but more will appear). Attached is the build failure on armhf (clean chroot with all bdeps satisfied). Just tested 4.7-20111222-1 as well, it built fine, installed and tested 5 known gcc ICEs (ace, webkit, 2 neon-related ones, a gfortran one) and all but one neon ICE were fixed :) Regards Konstantinos -- To UNSUBSCRIBE, email to debian-bsd-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/cabsevwt_qdasf6hg_ev2e3vvexdnnrxdvsqjerfbz6rbae4...@mail.gmail.com
Re: GCC-4.5 as the default for (at least some) architectures
On 26 April 2011 18:03, Matthias Klose d...@debian.org wrote: I'll make GCC 4.6 the default after the release of GCC 4.5.3, expected later this week, at least on amd64, armel, i386 and powerpc. Could you include armhf in the list as well? Thanks Konstantinos -- To UNSUBSCRIBE, email to debian-bsd-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/BANLkTimddKkTaiy1fyka6zMOj0o1YzBS=a...@mail.gmail.com
Re: GCC-4.5 as the default for (at least some) architectures
On 2 March 2011 03:34, Matthias Klose d...@debian.org wrote: I'll make gcc-4.5 the default for (at least some) architectures within the next two weeks before more transitions start. GCC-4.5 is already used as the default compiler for almost any other distribution, so there shouldn't be many surprises on at least the common architectures. About 50% of the build failures exposed by GCC-4.5 are fixed [1]. I didn't see issues on amd64 and i386, armel (although optimized for a different processor) and powerpc (some object files linked into shared libs had to be built as pic). As the maintainer file for the ports in GCC is a bit outdated, I'd like to ask which architectures should do the switch together with the four architectures mentioned above, and which not, and which ones should be better delayed, or dropped. Could you add armhf to the list? Konstantinos
