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Oleg Vinichenko

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Posts posted by Oleg Vinichenko

  1. ipython ebuilds are not coming from Gentoo tree and simple copy will not solve the problem (well, it will but not in a way we want). This is reported long time and I'll try to get a maintainer of overlay we merging ebuild from to force ipython update.

  2. Hello, everyone.

     

    The USE flags corresponding to the instruction sets and other features specific to the x86 (including x86-64) architecture are being moved into a separate USE flag group called CPU_FLAGS_X86.

     

    In order not to lose CPU-specific optimizations, users will be required to update their make.conf (and package.use) file. For example, if the following USE flags were present:

     

    USE="mmx mmxext sse sse2 sse3"

     

    Those flags need to be copied into:

     

    CPU_FLAGS_X86="mmx mmxext sse sse2 sse3"

     

    Please note that the same CPU_FLAGS_X86 variable is used both on 32-bit and 64-bit x86 (amd64) systems.

    When in doubt, you can consult the flag descriptions using one of the commonly available tools, e.g. ''equery uses'' from gentoolkit:

     

    equery uses media-video/ffmpeg

     

    Most of the flag names match /proc/cpuinfo names, with the notable exception of SSE3 which is called 'pni' in /proc/cpuinfo (please also do not confuse it with distinct SSSE3).

     

    To help users enable the correct USE flags, we are providing a Python script that generates the correct value using /proc/cpuinfo. It can be found in the {{Package|app-portage/cpuinfo2cpuflags}} package:

     

    emerge -1v app-portage/cpuinfo2cpuflags

    cpuinfo2cpuflags-x86

     

    In order to ensure safe migration and maintain compatibility with external repositories, it is recommended to preserve the old USE settings for a period of one year or until no package of interest is still using them

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