Date: Tue, 8 Dec 2015 00:41:20 +0300 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: gcc target_clones Hi, This is a new/upcoming gcc feature that we might find useful: https://developerblog.redhat.com/2015/12/07/octobernovember-2015-gnu-toolchain-update/ "GCC's function attribute feature has been extended to support another attribute: target_clones (<options>). This is used to specify that a function is to be cloned into multiple versions compiled with different target options than specified on the command line. The supported options and restrictions are the same as for target attribute. For instance on an x86, you could compile a function with target_clones("sse4.1,avx"). It will create 2 function clones, one compiled with -msse4.1 and another with -mavx. At the function call it will create resolver ifunc, that will dynamically call a clone suitable for current architecture." I found that this was discussed on the gcc-patches list (along with actual gcc patches implementing the feature) in October. It is unclear to me whether this made it, or will make it soon, into an official gcc release. Alexander
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