!ayCRiZriCVtuCUpeLp:nixos.org

Nix Cross Compiling

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19 Aug 2021
@yuka:yuka.devYuka (she/her) changed their display name from Yuka (she/her) to Yuka(she/her).07:13:34
@yuka:yuka.devYuka (she/her) changed their display name from Yuka(she/her) to Yuka (she/her).07:14:15
@jamie:memes.nzJamie hahaha 07:15:09
@jamie:memes.nzJamiethat’s really cool07:15:24
@jamie:memes.nzJamiegot any docs about how it’s implemented?07:15:37
@mic92:nixos.devMic92 Jamie: we will submit a paper in less than two months 07:38:07
@qyliss:fairydust.spaceAlyssa Rossoh wow that's interesting09:43:05
@mic92:nixos.devMic92qyliss: have you seen https://github.com/astro/microvm.nix already?10:42:31
@mic92:nixos.devMic92quite useful to evaluate a wider range of hypervisors10:42:48
@qyliss:fairydust.spaceAlyssa Rossoh that's neat10:45:20
@qyliss:fairydust.spaceAlyssa RossI just have the command line arguments for qemu, crosvm, and cloud-hypervisor burned into my brain10:45:35
@mic92:nixos.devMic92Is crosvm still your favorite?10:45:59
@qyliss:fairydust.spaceAlyssa Rosscloud-hypervisor is my favourite now10:46:09
@sandro:supersandro.deSandro
In reply to @mic92:nixos.dev
qyliss: have you seen https://github.com/astro/microvm.nix already?
Astro has some problems with the kernel where I couldn't help him. Did he ask you already?
11:08:15
@mic92:nixos.devMic92no11:08:34
@mic92:nixos.devMic92we chatted a bit yesterday so11:08:58
@sandro:supersandro.deSandroah okay. I think it was something with network throughput in the microvm kernel or something. Can't remember11:13:13
@mic92:nixos.devMic92If one wants to get decent throughput with VMs than SR-IOV is the way to go11:16:29
@mic92:nixos.devMic92Used 10Gbit/s/40Gbit/s NICs became quite affordable now and support this11:17:41
@symphorien:xlumurb.eusymphorienI'm trying to cross compile ocaml with host=build=x86 and target=musl (for pkgsStatic) and when trying to link the stdlib ocaml tries to use the prefixed compiler for target, which is not in $PATH18:56:25
@symphorien:xlumurb.eusymphorienhow do I add it to the $PATH ?18:56:38
@sternenseemann:systemli.orgsterni (he/him) My intuition would be that you need pkgsBuildTarget.targetPackages.stdenv.cc 18:57:55
@symphorien:xlumurb.eusymphoriendo I add it to the path with export or in buildInputs or ???18:58:49
@sternenseemann:systemli.orgsterni (he/him)would belong in nativeBuildInputs18:59:17
@symphorien:xlumurb.eusymphorienah right, for $PATH18:59:33
@sternenseemann:systemli.orgsterni (he/him)I'd recommend though that you try to make a ocaml cross compiler for something which isn't the same arch as you are building on first18:59:59
@sternenseemann:systemli.orgsterni (he/him)because implementing cross compilation with pkgsStatic lets you get away with things you wouldn't in that case19:00:28
@sternenseemann:systemli.orgsterni (he/him)for example you can run something from the target platform in the case of pkgsStatic19:00:47
@symphorien:xlumurb.eusymphorienwell for now I don't even get away with pkgsStatic so...19:01:02
@symphorien:xlumurb.eusymphorien why the targetPackages in pkgsBuildTarget.targetPackages.stdenv.cc ? 19:01:33

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