Dnia 2015-01-20, o godz. 10:40:17 Michał Górny <mgo...@gentoo.org> napisał(a):
> Dnia 2015-01-18, o godz. 21:44:05 > Michał Górny <mgo...@gentoo.org> napisał(a): > > > Hello, > > > > I would like to commit the following flags as cpu_flags_x86_desc. > > The list combines global USE flags with some local USE flags I've been > > able to find. > > Following your suggestions, I'm attaching three files: > > 1. updated cpu_flags_x86.desc, with: > > a. fma3/fma4 distinction, > > b. aes-ni renamed to aes for consistency with cpuinfo, we no longer > have to worry about USE flag collision with other USE=aes uses, > > c. complete and machine-parseable listing of cpuinfo flags. > > 2. cpuinfo2cpuflags-x86.py script that parses cpu_flags_x86.desc > and /proc/cpuinfo and generates a nice CPU_FLAGS_X86 value for you. We > need to decide where to put it (scripts/?). > > 3. Initial text of the news item for review. Ok, the hopefully-final text for the news item attached. -- 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 the instruction 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 the CPU_FLAGS_X86 variable is used both on x86 and amd64 systems. When in doubt, please consult the profiles/desc/cpu_flags_x86.desc file available in the Gentoo repository checkout. 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 app-portage/cpuinfo2cpuflags package: $ emerge -1v app-portage/cpuinfo2cpuflags $ cpuinfo2cpuflags-x86.py 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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