Riku Voipio a écrit : > On Thu, Jul 08, 2010 at 01:06:58PM +0200, Guillem Jover wrote: >> Personally, before any further discussion I'd like to see some numbers >> with core libraries (libc, libgcc, libgmp, libatlas? etc) built with >> softfp, which eventually might be able to switch to use the hwcaps >> infrastructure in a similar way as how packages like libc6-i686 are >> handled. > > The key limitation with hwcap approach is that it only extends to shared > libraries. Optimized binaries and plugins cannot be provided with hwcaps. > Things like libc-i686 are also problematic for endusers. How do I > quickly install all 686 optimized versions of libraries I already have? >
Note that the new alternative to hwcap is called "multiarch" in the GNU libc (something totally different than "multiarch" in Debian). It allows to provide different versions of a given symbol using an IFUNC symbol type. This will be resolved by the dynamic loader during relocation depending on the hardware characteristics. This avoid building multiple version of the same software (but still multiple versions of a given function), and to introduce more granularity (e.g. on x86 SSE, SSE2, SSE3, SSSE4.2, AVX, etc). Currently only x86, x86_64, ia64, powerpc and sparc are supported, but it should not be difficult to add support for more architectures. -- Aurelien Jarno GPG: 1024D/F1BCDB73 [email protected] http://www.aurel32.net -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
