Dnia 2015-01-21, o godz. 00:18:50 Duncan <1i5t5.dun...@cox.net> napisał(a):
> Michał Górny posted on Tue, 20 Jan 2015 10:40:17 +0100 as excerpted: > > > Display-If-Keyword: amd64 ~amd64 x86 ~x86 > > > > The USE flags corresponding to intruction sets and other features > > specific to the x86 architecture are being moved into a separate USE > > flag group called CPU_FLAGS_X86. > > So based on this preliminary news item, I decided to get ahead of the > game and add the use_expand to the appropriate make.conf sourced file... Attaching a new version. -- Best regards, Michał Górny
Title: CPU_FLAGS_X86 introduction Author: MichaŠGórny <mgo...@gentoo.org> Content-Type: text/plain Posted: 2015-01-xx Revision: 1 News-Item-Format: 1.0 Display-If-Keyword: amd64 ~amd64 x86 ~x86 The USE flags corresponding to intruction sets and other features specific to the x86 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 CPU_FLAGS_X86 is used both on x86 and amd64 systems. When in doubt, please consult profiles/desc/cpu_flags_x86.desc. 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 you enable the correct USE flags, we are providing a Python script which generates the correct value from your /proc/cpuinfo [1]. The Python script can be downloaded and executed using the following command: $ wget -O - dev.gentoo.org/~mgorny/cpuinfo2cpuflags-x86.py | python 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. [1]:https://bitbucket.org/mgorny/cpuinfo2cpuflags
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