Re: [Nix-dev] CPU optimized packages

[Shea Levy]

Hi Danny, Unfortunately, there's not a good answer to this because -march=native is inherently impure. Is there any reason you can't tell users "Find out what -march=native means on your system and then fill in nixpkgs.config.extra_cflags with the result?" or some such (Note that config.extra_cflags doesn't currently exist AFAIK, but could)? ~Shea On 02/07/2013 07:36 AM, Danny Wilson wrote: With help of the gentoo wiki ( http://en.gentoo-wiki.com/wiki/Hardware_CFLAGS ) I found this produces a nice GCC option list: echo "" | gcc -O3 -march=native -mtune=native -v -E - 2>&1 |grep cc1 |sed -r 's/.*? - -(.*)$/-\1/' Danny Wilson 7 februari 2013 12:37 I'd like some packages to be optimized for my server CPU. GCC has -march=native for this, but that would not generate a cpu specific nixos hash. Is there a nix _expression_ available which adds something like this: gcc -march=native -Q --help=target |grep enabled to CFLAGS and correctly hashing it? _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev

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